Merge branch 'google:master' into image-embedder-python

mediapipe/calculators/tensor/BUILD

@@ -1324,6 +1324,7 @@ cc_test(
     name = "image_to_tensor_utils_test",
     srcs = ["image_to_tensor_utils_test.cc"],
     deps = [
+        ":image_to_tensor_calculator_cc_proto",
         ":image_to_tensor_utils",
         "//mediapipe/framework/formats:rect_cc_proto",
         "//mediapipe/framework/port:gtest_main",

mediapipe/calculators/tensor/image_to_tensor_converter_gl_buffer.cc

@@ -330,9 +330,8 @@ class GlProcessor : public ImageToTensorConverter {
   absl::Status ValidateTensorShape(const Tensor::Shape& output_shape) {
     RET_CHECK_EQ(output_shape.dims.size(), 4)
         << "Wrong output dims size: " << output_shape.dims.size();
-    RET_CHECK_EQ(output_shape.dims[0], 1)
+    RET_CHECK_GE(output_shape.dims[0], 1)
-        << "Handling batch dimension not equal to 1 is not implemented in this "
+        << "The batch dimension needs to be greater or equal to 1.";
-           "converter.";
     RET_CHECK_EQ(output_shape.dims[3], 3)
         << "Wrong output channel: " << output_shape.dims[3];
     return absl::OkStatus();

mediapipe/calculators/tensor/image_to_tensor_utils_test.cc

@@ -172,7 +172,7 @@ constexpr char kValidIntProto[] = R"(
   output_tensor_height: 200
 )";
 
-TEST(ValidateOptionOutputDims, ValidProtos) {
+TEST(ValidateOptionOutputDims, ImageToTensorCalcOptions) {
   const auto float_options =
       mediapipe::ParseTextProtoOrDie<mediapipe::ImageToTensorCalculatorOptions>(
           kValidFloatProto);
@@ -202,7 +202,7 @@ TEST(ValidateOptionOutputDims, EmptyProto) {
                        HasSubstr("Valid output tensor width is required")));
 }
 
-TEST(GetOutputTensorParams, SetValues) {
+TEST(GetOutputTensorParams, ImageToTensorCalcOptionsSetValues) {
   // Test int range with ImageToTensorCalculatorOptions.
   const auto int_options =
       mediapipe::ParseTextProtoOrDie<mediapipe::ImageToTensorCalculatorOptions>(

mediapipe/framework/api2/builder.h

@@ -106,6 +106,13 @@ class MultiPort : public Single {
     return Single{&GetWithAutoGrow(&vec_, index)};
   }
 
+  template <typename U>
+  auto Cast() {
+    using SingleCastT =
+        std::invoke_result_t<decltype(&Single::template Cast<U>), Single*>;
+    return MultiPort<SingleCastT>(&vec_);
+  }
+
  private:
   std::vector<std::unique_ptr<Base>>& vec_;
 };

mediapipe/framework/api2/builder_test.cc

@@ -445,6 +445,57 @@ TEST(BuilderTest, AnyTypeCanBeCast) {
   EXPECT_THAT(graph.GetConfig(), EqualsProto(expected));
 }
 
+TEST(BuilderTest, MultiPortIsCastToMultiPort) {
+  builder::Graph graph;
+  builder::MultiSource<AnyType> any_input = graph.In("ANY_INPUT");
+  builder::MultiSource<int> int_input = any_input.Cast<int>();
+  builder::MultiDestination<AnyType> any_output = graph.Out("ANY_OUTPUT");
+  builder::MultiDestination<int> int_output = any_output.Cast<int>();
+  int_input >> int_output;
+
+  CalculatorGraphConfig expected =
+      mediapipe::ParseTextProtoOrDie<CalculatorGraphConfig>(R"pb(
+        input_stream: "ANY_INPUT:__stream_0"
+        output_stream: "ANY_OUTPUT:__stream_0"
+      )pb");
+  EXPECT_THAT(graph.GetConfig(), EqualsProto(expected));
+}
+
+TEST(BuilderTest, MultiPortCanBeSlicedToSinglePort) {
+  builder::Graph graph;
+  builder::MultiSource<AnyType> any_multi_input = graph.In("ANY_INPUT");
+  builder::Source<AnyType> any_input = any_multi_input;
+  builder::MultiDestination<AnyType> any_multi_output = graph.Out("ANY_OUTPUT");
+  builder::Destination<AnyType> any_output = any_multi_output;
+  any_input >> any_output;
+
+  CalculatorGraphConfig expected =
+      mediapipe::ParseTextProtoOrDie<CalculatorGraphConfig>(R"pb(
+        input_stream: "ANY_INPUT:__stream_0"
+        output_stream: "ANY_OUTPUT:__stream_0"
+      )pb");
+  EXPECT_THAT(graph.GetConfig(), EqualsProto(expected));
+}
+
+TEST(BuilderTest, SinglePortAccessWorksThroughSlicing) {
+  builder::Graph graph;
+  builder::Source<int> int_input = graph.In("INT_INPUT").Cast<int>();
+  builder::Source<AnyType> any_input = graph.In("ANY_OUTPUT");
+  builder::Destination<int> int_output = graph.Out("INT_OUTPUT").Cast<int>();
+  builder::Destination<AnyType> any_output = graph.Out("ANY_OUTPUT");
+  int_input >> int_output;
+  any_input >> any_output;
+
+  CalculatorGraphConfig expected =
+      mediapipe::ParseTextProtoOrDie<CalculatorGraphConfig>(R"pb(
+        input_stream: "ANY_OUTPUT:__stream_0"
+        input_stream: "INT_INPUT:__stream_1"
+        output_stream: "ANY_OUTPUT:__stream_0"
+        output_stream: "INT_OUTPUT:__stream_1"
+      )pb");
+  EXPECT_THAT(graph.GetConfig(), EqualsProto(expected));
+}
+
 }  // namespace test
 }  // namespace api2
 }  // namespace mediapipe

mediapipe/gpu/gl_context_egl.cc

@@ -38,20 +38,18 @@ static pthread_key_t egl_release_thread_key;
 static pthread_once_t egl_release_key_once = PTHREAD_ONCE_INIT;
 
 static void EglThreadExitCallback(void* key_value) {
-#if defined(__ANDROID__)
+  EGLDisplay current_display = eglGetCurrentDisplay();
-  eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE,
+  if (current_display != EGL_NO_DISPLAY) {
-                 EGL_NO_CONTEXT);
+    // Some implementations have chosen to allow EGL_NO_DISPLAY as a valid
-#else
+    // display parameter for eglMakeCurrent. This behavior is not portable to
-  // Some implementations have chosen to allow EGL_NO_DISPLAY as a valid display
+    // all EGL implementations, and should be considered as an undocumented
-  // parameter for eglMakeCurrent. This behavior is not portable to all EGL
+    // vendor extension.
-  // implementations, and should be considered as an undocumented vendor
-  // extension.
     // https://www.khronos.org/registry/EGL/sdk/docs/man/html/eglMakeCurrent.xhtml
-  //
+    // Instead, to release the current context, we pass the current display.
-  // NOTE: crashes on some Android devices (occurs with libGLES_meow.so).
+    // If the current display is already EGL_NO_DISPLAY, no context is current.
-  eglMakeCurrent(eglGetDisplay(EGL_DEFAULT_DISPLAY), EGL_NO_SURFACE,
+    eglMakeCurrent(current_display, EGL_NO_SURFACE, EGL_NO_SURFACE,
-                 EGL_NO_SURFACE, EGL_NO_CONTEXT);
+                   EGL_NO_CONTEXT);
-#endif
+  }
   eglReleaseThread();
 }
 

mediapipe/model_maker/python/BUILD

@@ -20,3 +20,10 @@ package_group(
         "//mediapipe/model_maker/...",
     ],
 )
+
+package_group(
+    name = "1p_client",
+    packages = [
+        "//research/privacy/learning/fl_eval/pcvr/...",
+    ],
+)

mediapipe/model_maker/python/core/hyperparameters.py

@@ -19,7 +19,6 @@ import tempfile
 from typing import Optional
 
 
-# TODO: Integrate this class into ImageClassifier and other tasks.
 @dataclasses.dataclass
 class BaseHParams:
   """Hyperparameters used for training models.

mediapipe/model_maker/python/core/tasks/BUILD

@@ -45,7 +45,10 @@ py_library(
     srcs = ["classifier.py"],
     deps = [
         ":custom_model",
+        "//mediapipe/model_maker/python/core:hyperparameters",
+        "//mediapipe/model_maker/python/core/data:classification_dataset",
         "//mediapipe/model_maker/python/core/data:dataset",
+        "//mediapipe/model_maker/python/core/utils:model_util",
     ],
 )
 

mediapipe/model_maker/python/core/tasks/classifier.py

@@ -13,24 +13,24 @@
 # limitations under the License.
 """Custom classifier."""
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import os
-from typing import Any, List
+from typing import Any, Callable, Optional, Sequence, Union
 
 import tensorflow as tf
 
+from mediapipe.model_maker.python.core import hyperparameters as hp
+from mediapipe.model_maker.python.core.data import classification_dataset as classification_ds
 from mediapipe.model_maker.python.core.data import dataset
 from mediapipe.model_maker.python.core.tasks import custom_model
+from mediapipe.model_maker.python.core.utils import model_util
 
 
 class Classifier(custom_model.CustomModel):
   """An abstract base class that represents a TensorFlow classifier."""
 
-  def __init__(self, model_spec: Any, label_names: List[str], shuffle: bool):
+  def __init__(self, model_spec: Any, label_names: Sequence[str],
-    """Initilizes a classifier with its specifications.
+               shuffle: bool):
+    """Initializes a classifier with its specifications.
 
     Args:
         model_spec: Specification for the model.
@@ -40,6 +40,59 @@ class Classifier(custom_model.CustomModel):
     super(Classifier, self).__init__(model_spec, shuffle)
     self._label_names = label_names
     self._num_classes = len(label_names)
+    self._model: tf.keras.Model = None
+    self._optimizer: Union[str, tf.keras.optimizers.Optimizer] = None
+    self._loss_function: Union[str, tf.keras.losses.Loss] = None
+    self._metric_function: Union[str, tf.keras.metrics.Metric] = None
+    self._callbacks: Sequence[tf.keras.callbacks.Callback] = None
+    self._hparams: hp.BaseHParams = None
+    self._history: tf.keras.callbacks.History = None
+
+  # TODO: Integrate this into all Model Maker tasks.
+  def _train_model(self,
+                   train_data: classification_ds.ClassificationDataset,
+                   validation_data: classification_ds.ClassificationDataset,
+                   preprocessor: Optional[Callable[..., bool]] = None):
+    """Trains the classifier model.
+
+    Compiles and fits the tf.keras `_model` and records the `_history`.
+
+    Args:
+      train_data: Training data.
+      validation_data: Validation data.
+      preprocessor: An optional data preprocessor that can be used when
+        generating a tf.data.Dataset.
+    """
+    tf.compat.v1.logging.info('Training the models...')
+    if len(train_data) < self._hparams.batch_size:
+      raise ValueError(
+          f'The size of the train_data {len(train_data)} can\'t be smaller than'
+          f' batch_size {self._hparams.batch_size}. To solve this problem, set'
+          ' the batch_size smaller or increase the size of the train_data.')
+
+    train_dataset = train_data.gen_tf_dataset(
+        batch_size=self._hparams.batch_size,
+        is_training=True,
+        shuffle=self._shuffle,
+        preprocess=preprocessor)
+    self._hparams.steps_per_epoch = model_util.get_steps_per_epoch(
+        steps_per_epoch=self._hparams.steps_per_epoch,
+        batch_size=self._hparams.batch_size,
+        train_data=train_data)
+    train_dataset = train_dataset.take(count=self._hparams.steps_per_epoch)
+    validation_dataset = validation_data.gen_tf_dataset(
+        batch_size=self._hparams.batch_size,
+        is_training=False,
+        preprocess=preprocessor)
+    self._model.compile(
+        optimizer=self._optimizer,
+        loss=self._loss_function,
+        metrics=[self._metric_function])
+    self._history = self._model.fit(
+        x=train_dataset,
+        epochs=self._hparams.epochs,
+        validation_data=validation_dataset,
+        callbacks=self._callbacks)
 
   def evaluate(self, data: dataset.Dataset, batch_size: int = 32) -> Any:
     """Evaluates the classifier with the provided evaluation dataset.

mediapipe/model_maker/python/core/utils/BUILD

@@ -35,6 +35,7 @@ py_library(
     name = "model_util",
     srcs = ["model_util.py"],
     deps = [
+        ":file_util",
         ":quantization",
         "//mediapipe/model_maker/python/core/data:dataset",
     ],
@@ -50,6 +51,18 @@ py_test(
     ],
 )
 
+py_library(
+    name = "file_util",
+    srcs = ["file_util.py"],
+)
+
+py_test(
+    name = "file_util_test",
+    srcs = ["file_util_test.py"],
+    data = ["//mediapipe/model_maker/python/core/utils/testdata"],
+    deps = [":file_util"],
+)
+
 py_library(
     name = "loss_functions",
     srcs = ["loss_functions.py"],

mediapipe/model_maker/python/core/utils/file_util.py

@@ -0,0 +1,36 @@
+# Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Utilities for files."""
+
+import os
+
+# resources dependency
+
+
+def get_absolute_path(file_path: str) -> str:
+  """Gets the absolute path of a file.
+
+  Args:
+    file_path: The path to a file relative to the `mediapipe` dir
+
+  Returns:
+   The full path of the file
+  """
+  # Extract the file path before mediapipe/ as the `base_dir`. By joining it
+  # with the `path` which defines the relative path under mediapipe/, it
+  # yields to the absolute path of the model files directory.
+  cwd = os.path.dirname(__file__)
+  base_dir = cwd[:cwd.rfind('mediapipe')]
+  absolute_path = os.path.join(base_dir, file_path)
+  return absolute_path

mediapipe/model_maker/python/core/utils/file_util_test.py

@@ -0,0 +1,29 @@
+# Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import os
+
+from absl.testing import absltest
+from mediapipe.model_maker.python.core.utils import file_util
+
+
+class FileUtilTest(absltest.TestCase):
+
+  def test_get_absolute_path(self):
+    test_file = 'mediapipe/model_maker/python/core/utils/testdata/test.txt'
+    absolute_path = file_util.get_absolute_path(test_file)
+    self.assertTrue(os.path.exists(absolute_path))
+
+
+if __name__ == '__main__':
+  absltest.main()

mediapipe/model_maker/python/core/utils/model_util.py

@@ -11,7 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-"""Utilities for keras models."""
+"""Utilities for models."""
 
 from __future__ import absolute_import
 from __future__ import division
@@ -19,21 +19,33 @@ from __future__ import print_function
 
 import os
 import tempfile
-from typing import Any, Callable, Dict, List, Optional, Text, Tuple, Union
+from typing import Any, Callable, Dict, List, Optional, Sequence, Tuple, Union
 
 # Dependency imports
 
 import numpy as np
 import tensorflow as tf
 
-# resources dependency
 from mediapipe.model_maker.python.core.data import dataset
+from mediapipe.model_maker.python.core.utils import file_util
 from mediapipe.model_maker.python.core.utils import quantization
 
 DEFAULT_SCALE, DEFAULT_ZERO_POINT = 0, 0
 ESTIMITED_STEPS_PER_EPOCH = 1000
 
 
+def get_default_callbacks(
+    export_dir: str) -> Sequence[tf.keras.callbacks.Callback]:
+  """Gets default callbacks."""
+  summary_dir = os.path.join(export_dir, 'summaries')
+  summary_callback = tf.keras.callbacks.TensorBoard(summary_dir)
+
+  checkpoint_path = os.path.join(export_dir, 'checkpoint')
+  checkpoint_callback = tf.keras.callbacks.ModelCheckpoint(
+      checkpoint_path, save_weights_only=True)
+  return [summary_callback, checkpoint_callback]
+
+
 def load_keras_model(model_path: str,
                      compile_on_load: bool = False) -> tf.keras.Model:
   """Loads a tensorflow Keras model from file and returns the Keras model.
@@ -49,16 +61,26 @@ def load_keras_model(model_path: str,
   Returns:
     A tensorflow Keras model.
   """
-  # Extract the file path before mediapipe/ as the `base_dir`. By joining it
+  absolute_path = file_util.get_absolute_path(model_path)
-  # with the `model_path` which defines the relative path under mediapipe/, it
-  # yields to the aboslution path of the model files directory.
-  cwd = os.path.dirname(__file__)
-  base_dir = cwd[:cwd.rfind('mediapipe')]
-  absolute_path = os.path.join(base_dir, model_path)
   return tf.keras.models.load_model(
       absolute_path, custom_objects={'tf': tf}, compile=compile_on_load)
 
 
+def load_tflite_model_buffer(model_path: str) -> bytearray:
+  """Loads a TFLite model buffer from file.
+
+  Args:
+    model_path: Relative path to a TFLite file
+
+  Returns:
+    A TFLite model buffer
+  """
+  absolute_path = file_util.get_absolute_path(model_path)
+  with tf.io.gfile.GFile(absolute_path, 'rb') as f:
+    tflite_model_buffer = f.read()
+  return tflite_model_buffer
+
+
 def get_steps_per_epoch(steps_per_epoch: Optional[int] = None,
                         batch_size: Optional[int] = None,
                         train_data: Optional[dataset.Dataset] = None) -> int:
@@ -174,7 +196,7 @@ class WarmUp(tf.keras.optimizers.schedules.LearningRateSchedule):
           lambda: self.decay_schedule_fn(step),
           name=name)
 
-  def get_config(self) -> Dict[Text, Any]:
+  def get_config(self) -> Dict[str, Any]:
     return {
         'initial_learning_rate': self.initial_learning_rate,
         'decay_schedule_fn': self.decay_schedule_fn,

mediapipe/model_maker/python/core/utils/model_util_test.py

@@ -24,7 +24,7 @@ from mediapipe.model_maker.python.core.utils import test_util
 
 class ModelUtilTest(tf.test.TestCase, parameterized.TestCase):
 
-  def test_load_model(self):
+  def test_load_keras_model(self):
     input_dim = 4
     model = test_util.build_model(input_shape=[input_dim], num_classes=2)
     saved_model_path = os.path.join(self.get_temp_dir(), 'saved_model')
@@ -36,6 +36,19 @@ class ModelUtilTest(tf.test.TestCase, parameterized.TestCase):
     loaded_model_output = loaded_model.predict_on_batch(input_tensors)
     self.assertTrue((model_output == loaded_model_output).all())
 
+  def test_load_tflite_model_buffer(self):
+    input_dim = 4
+    model = test_util.build_model(input_shape=[input_dim], num_classes=2)
+    tflite_model = model_util.convert_to_tflite(model)
+    tflite_file = os.path.join(self.get_temp_dir(), 'model.tflite')
+    model_util.save_tflite(tflite_model=tflite_model, tflite_file=tflite_file)
+
+    tflite_model_buffer = model_util.load_tflite_model_buffer(tflite_file)
+    test_util.test_tflite(
+        keras_model=model,
+        tflite_model=tflite_model_buffer,
+        size=[1, input_dim])
+
   @parameterized.named_parameters(
       dict(
           testcase_name='input_only_steps_per_epoch',

mediapipe/model_maker/python/core/utils/testdata/BUILD

@@ -0,0 +1,23 @@
+# Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+package(
+    default_visibility = ["//mediapipe/model_maker/python/core/utils:__subpackages__"],
+    licenses = ["notice"],  # Apache 2.0
+)
+
+filegroup(
+    name = "testdata",
+    srcs = ["test.txt"],
+)

mediapipe/model_maker/python/vision/image_classifier/BUILD

@@ -28,6 +28,8 @@ py_library(
         ":dataset",
         ":hyperparameters",
         ":image_classifier",
+        ":image_classifier_options",
+        ":model_options",
         ":model_spec",
     ],
 )
@@ -58,6 +60,24 @@ py_test(
 py_library(
     name = "hyperparameters",
     srcs = ["hyperparameters.py"],
+    deps = [
+        "//mediapipe/model_maker/python/core:hyperparameters",
+    ],
+)
+
+py_library(
+    name = "model_options",
+    srcs = ["model_options.py"],
+)
+
+py_library(
+    name = "image_classifier_options",
+    srcs = ["image_classifier_options.py"],
+    deps = [
+        ":hyperparameters",
+        ":model_options",
+        ":model_spec",
+    ],
 )
 
 py_library(
@@ -74,6 +94,8 @@ py_library(
     srcs = ["image_classifier.py"],
     deps = [
         ":hyperparameters",
+        ":image_classifier_options",
+        ":model_options",
         ":model_spec",
         ":train_image_classifier_lib",
         "//mediapipe/model_maker/python/core/data:classification_dataset",
@@ -99,6 +121,7 @@ py_library(
 
 py_test(
     name = "image_classifier_test",
+    size = "large",
     srcs = ["image_classifier_test.py"],
     shard_count = 2,
     tags = ["requires-net:external"],

mediapipe/model_maker/python/vision/image_classifier/__init__.py

@@ -16,10 +16,14 @@
 from mediapipe.model_maker.python.vision.image_classifier import dataset
 from mediapipe.model_maker.python.vision.image_classifier import hyperparameters
 from mediapipe.model_maker.python.vision.image_classifier import image_classifier
+from mediapipe.model_maker.python.vision.image_classifier import image_classifier_options
+from mediapipe.model_maker.python.vision.image_classifier import model_options
 from mediapipe.model_maker.python.vision.image_classifier import model_spec
 
 ImageClassifier = image_classifier.ImageClassifier
 HParams = hyperparameters.HParams
 Dataset = dataset.Dataset
+ModelOptions = model_options.ImageClassifierModelOptions
 ModelSpec = model_spec.ModelSpec
 SupportedModels = model_spec.SupportedModels
+ImageClassifierOptions = image_classifier_options.ImageClassifierOptions

mediapipe/model_maker/python/vision/image_classifier/hyperparameters.py

@@ -14,28 +14,20 @@
 """Hyperparameters for training image classification models."""
 
 import dataclasses
-import tempfile
+
-from typing import Optional
+from mediapipe.model_maker.python.core import hyperparameters as hp
 
 
-# TODO: Expose other hyperparameters, e.g. data augmentation
-# hyperparameters if requested.
 @dataclasses.dataclass
-class HParams:
+class HParams(hp.BaseHParams):
   """The hyperparameters for training image classifiers.
 
-  The hyperparameters include:
+  Attributes:
-    # Parameters about training data.
+    learning_rate: Learning rate to use for gradient descent training.
+    batch_size: Batch size for training.
+    epochs: Number of training iterations over the dataset.
     do_fine_tuning: If true, the base module is trained together with the
       classification layer on top.
-    shuffle: A boolean controlling if shuffle the dataset. Default to false.
-
-    # Parameters about training configuration
-    train_epochs: Training will do this many iterations over the dataset.
-    batch_size: Each training step samples a batch of this many images.
-    learning_rate: The learning rate to use for gradient descent training.
-    dropout_rate: The fraction of the input units to drop, used in dropout
-      layer.
     l1_regularizer: A regularizer that applies a L1 regularization penalty.
     l2_regularizer: A regularizer that applies a L2 regularization penalty.
     label_smoothing: Amount of label smoothing to apply. See tf.keras.losses for
@@ -43,32 +35,21 @@ class HParams:
     do_data_augmentation: A boolean controlling whether the training dataset is
       augmented by randomly distorting input images, including random cropping,
       flipping, etc. See utils.image_preprocessing documentation for details.
-    steps_per_epoch: An optional integer indicate the number of training steps
-      per epoch. If not set, the training pipeline calculates the default steps
-      per epoch as the training dataset size devided by batch size.
     decay_samples: Number of training samples used to calculate the decay steps
       and create the training optimizer.
     warmup_steps: Number of warmup steps for a linear increasing warmup schedule
-       on learning rate. Used to set up warmup schedule by model_util.WarmUp.
+       on learning rate. Used to set up warmup schedule by model_util.WarmUp.s
-
-    # Parameters about the saved checkpoint
-    model_dir: The location of model checkpoint files and exported model files.
   """
-  # Parameters about training data
+  # Parameters from BaseHParams class.
-  do_fine_tuning: bool = False
+  learning_rate: float = 0.001
-  shuffle: bool = False
+  batch_size: int = 2
+  epochs: int = 10
   # Parameters about training configuration
-  train_epochs: int = 5
+  do_fine_tuning: bool = False
-  batch_size: int = 32
-  learning_rate: float = 0.005
-  dropout_rate: float = 0.2
   l1_regularizer: float = 0.0
   l2_regularizer: float = 0.0001
   label_smoothing: float = 0.1
   do_data_augmentation: bool = True
-  steps_per_epoch: Optional[int] = None
+  # TODO: Use lr_decay in hp.baseHParams to infer decay_samples.
   decay_samples: int = 10000 * 256
   warmup_epochs: int = 2
-
-  # Parameters about the saved checkpoint
-  model_dir: str = tempfile.mkdtemp()

mediapipe/model_maker/python/vision/image_classifier/image_classifier.py

@@ -25,6 +25,8 @@ from mediapipe.model_maker.python.core.utils import model_util
 from mediapipe.model_maker.python.core.utils import quantization
 from mediapipe.model_maker.python.vision.core import image_preprocessing
 from mediapipe.model_maker.python.vision.image_classifier import hyperparameters as hp
+from mediapipe.model_maker.python.vision.image_classifier import image_classifier_options
+from mediapipe.model_maker.python.vision.image_classifier import model_options as model_opt
 from mediapipe.model_maker.python.vision.image_classifier import model_spec as ms
 from mediapipe.model_maker.python.vision.image_classifier import train_image_classifier_lib
 from mediapipe.tasks.python.metadata.metadata_writers import image_classifier as image_classifier_writer
@@ -35,17 +37,20 @@ class ImageClassifier(classifier.Classifier):
   """ImageClassifier for building image classification model."""
 
   def __init__(self, model_spec: ms.ModelSpec, label_names: List[str],
-               hparams: hp.HParams):
+               hparams: hp.HParams,
+               model_options: model_opt.ImageClassifierModelOptions):
     """Initializes ImageClassifier class.
 
     Args:
       model_spec: Specification for the model.
       label_names: A list of label names for the classes.
       hparams: The hyperparameters for training image classifier.
+      model_options: Model options for creating image classifier.
     """
     super().__init__(
         model_spec=model_spec, label_names=label_names, shuffle=hparams.shuffle)
     self._hparams = hparams
+    self._model_options = model_options
     self._preprocess = image_preprocessing.Preprocessor(
         input_shape=self._model_spec.input_image_shape,
         num_classes=self._num_classes,
@@ -57,30 +62,37 @@ class ImageClassifier(classifier.Classifier):
   @classmethod
   def create(
       cls,
-      model_spec: ms.SupportedModels,
       train_data: classification_ds.ClassificationDataset,
       validation_data: classification_ds.ClassificationDataset,
-      hparams: Optional[hp.HParams] = None,
+      options: image_classifier_options.ImageClassifierOptions,
   ) -> 'ImageClassifier':
     """Creates and trains an image classifier.
 
-    Loads data and trains the model based on data for image classification.
+    Loads data and trains the model based on data for image classification. If a
+    checkpoint file exists in the {options.hparams.export_dir}/checkpoint/
+    directory, the training process will load the weight from the checkpoint
+    file for continual training.
 
     Args:
-      model_spec: Specification for the model.
       train_data: Training data.
       validation_data: Validation data.
-      hparams: Hyperparameters for training image classifier.
+      options: configuration to create image classifier.
 
     Returns:
       An instance based on ImageClassifier.
     """
-    if hparams is None:
+    if options.hparams is None:
-      hparams = hp.HParams()
+      options.hparams = hp.HParams()
 
-    spec = ms.SupportedModels.get(model_spec)
+    if options.model_options is None:
+      options.model_options = model_opt.ImageClassifierModelOptions()
+
+    spec = ms.SupportedModels.get(options.supported_model)
     image_classifier = cls(
-        model_spec=spec, label_names=train_data.label_names, hparams=hparams)
+        model_spec=spec,
+        label_names=train_data.label_names,
+        hparams=options.hparams,
+        model_options=options.model_options)
 
     image_classifier._create_model()
 
@@ -90,6 +102,7 @@ class ImageClassifier(classifier.Classifier):
 
     return image_classifier
 
+  # TODO: Migrate to the shared training library of Model Maker.
   def _train(self, train_data: classification_ds.ClassificationDataset,
              validation_data: classification_ds.ClassificationDataset):
     """Trains the model with input train_data.
@@ -142,7 +155,7 @@ class ImageClassifier(classifier.Classifier):
 
     self._model = tf.keras.Sequential([
         tf.keras.Input(shape=(image_size[0], image_size[1], 3)), module_layer,
-        tf.keras.layers.Dropout(rate=self._hparams.dropout_rate),
+        tf.keras.layers.Dropout(rate=self._model_options.dropout_rate),
         tf.keras.layers.Dense(
             units=self._num_classes,
             activation='softmax',
@@ -167,10 +180,10 @@ class ImageClassifier(classifier.Classifier):
         path is {self._hparams.model_dir}/{model_name}.
       quantization_config: The configuration for model quantization.
     """
-    if not tf.io.gfile.exists(self._hparams.model_dir):
+    if not tf.io.gfile.exists(self._hparams.export_dir):
-      tf.io.gfile.makedirs(self._hparams.model_dir)
+      tf.io.gfile.makedirs(self._hparams.export_dir)
-    tflite_file = os.path.join(self._hparams.model_dir, model_name)
+    tflite_file = os.path.join(self._hparams.export_dir, model_name)
-    metadata_file = os.path.join(self._hparams.model_dir, 'metadata.json')
+    metadata_file = os.path.join(self._hparams.export_dir, 'metadata.json')
 
     tflite_model = model_util.convert_to_tflite(
         model=self._model,
@@ -180,7 +193,7 @@ class ImageClassifier(classifier.Classifier):
         tflite_model,
         self._model_spec.mean_rgb,
         self._model_spec.stddev_rgb,
-        labels=metadata_writer.Labels().add(self._label_names))
+        labels=metadata_writer.Labels().add(list(self._label_names)))
     tflite_model_with_metadata, metadata_json = writer.populate()
     model_util.save_tflite(tflite_model_with_metadata, tflite_file)
     with open(metadata_file, 'w') as f:

mediapipe/model_maker/python/vision/image_classifier/image_classifier_options.py

@@ -0,0 +1,35 @@
+# Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Options for building image classifier."""
+
+import dataclasses
+from typing import Optional
+
+from mediapipe.model_maker.python.vision.image_classifier import hyperparameters
+from mediapipe.model_maker.python.vision.image_classifier import model_options as model_opt
+from mediapipe.model_maker.python.vision.image_classifier import model_spec
+
+
+@dataclasses.dataclass
+class ImageClassifierOptions:
+  """Configurable options for building image classifier.
+
+  Attributes:
+    supported_model: A model from the SupportedModels enum.
+    model_options: A set of options for configuring the selected model.
+    hparams: A set of hyperparameters used to train the image classifier.
+  """
+  supported_model: model_spec.SupportedModels
+  model_options: Optional[model_opt.ImageClassifierModelOptions] = None
+  hparams: Optional[hyperparameters.HParams] = None

mediapipe/model_maker/python/vision/image_classifier/image_classifier_test.py

@@ -13,9 +13,13 @@
 # limitations under the License.
 
 import filecmp
+import io
 import os
+import tempfile
 
+from unittest import mock as unittest_mock
 from absl.testing import parameterized
+import mock
 import numpy as np
 import tensorflow as tf
 
@@ -54,54 +58,74 @@ class ImageClassifierTest(tf.test.TestCase, parameterized.TestCase):
     super(ImageClassifierTest, self).setUp()
     all_data = self._gen_cmy_data()
     # Splits data, 90% data for training, 10% for testing
-    self.train_data, self.test_data = all_data.split(0.9)
+    self._train_data, self._test_data = all_data.split(0.9)
 
   @parameterized.named_parameters(
       dict(
           testcase_name='mobilenet_v2',
-          model_spec=image_classifier.SupportedModels.MOBILENET_V2,
+          options=image_classifier.ImageClassifierOptions(
+              supported_model=image_classifier.SupportedModels.MOBILENET_V2,
               hparams=image_classifier.HParams(
-              train_epochs=1, batch_size=1, shuffle=True)),
+                  epochs=1,
+                  batch_size=1,
+                  shuffle=True,
+                  export_dir=tempfile.mkdtemp()))),
       dict(
           testcase_name='efficientnet_lite0',
-          model_spec=image_classifier.SupportedModels.EFFICIENTNET_LITE0,
+          options=image_classifier.ImageClassifierOptions(
+              supported_model=(
+                  image_classifier.SupportedModels.EFFICIENTNET_LITE0),
               hparams=image_classifier.HParams(
-              train_epochs=1, batch_size=1, shuffle=True)),
+                  epochs=1,
+                  batch_size=1,
+                  shuffle=True,
+                  export_dir=tempfile.mkdtemp()))),
+      dict(
+          testcase_name='efficientnet_lite0_change_dropout_rate',
+          options=image_classifier.ImageClassifierOptions(
+              supported_model=(
+                  image_classifier.SupportedModels.EFFICIENTNET_LITE0),
+              model_options=image_classifier.ModelOptions(dropout_rate=0.1),
+              hparams=image_classifier.HParams(
+                  epochs=1,
+                  batch_size=1,
+                  shuffle=True,
+                  export_dir=tempfile.mkdtemp()))),
       dict(
           testcase_name='efficientnet_lite2',
-          model_spec=image_classifier.SupportedModels.EFFICIENTNET_LITE2,
+          options=image_classifier.ImageClassifierOptions(
+              supported_model=(
+                  image_classifier.SupportedModels.EFFICIENTNET_LITE2),
               hparams=image_classifier.HParams(
-              train_epochs=1, batch_size=1, shuffle=True)),
+                  epochs=1,
+                  batch_size=1,
+                  shuffle=True,
+                  export_dir=tempfile.mkdtemp()))),
       dict(
           testcase_name='efficientnet_lite4',
-          model_spec=image_classifier.SupportedModels.EFFICIENTNET_LITE4,
+          options=image_classifier.ImageClassifierOptions(
+              supported_model=(
+                  image_classifier.SupportedModels.EFFICIENTNET_LITE4),
               hparams=image_classifier.HParams(
-              train_epochs=1, batch_size=1, shuffle=True)),
+                  epochs=1,
+                  batch_size=1,
+                  shuffle=True,
+                  export_dir=tempfile.mkdtemp()))),
   )
-  def test_create_and_train_model(self,
+  def test_create_and_train_model(
-                                  model_spec: image_classifier.SupportedModels,
+      self, options: image_classifier.ImageClassifierOptions):
-                                  hparams: image_classifier.HParams):
     model = image_classifier.ImageClassifier.create(
-        model_spec=model_spec,
+        train_data=self._train_data,
-        train_data=self.train_data,
+        validation_data=self._test_data,
-        hparams=hparams,
+        options=options)
-        validation_data=self.test_data)
-    self._test_accuracy(model)
-
-  def test_efficientnetlite0_model_train_and_export(self):
-    hparams = image_classifier.HParams(
-        train_epochs=1, batch_size=1, shuffle=True)
-    model = image_classifier.ImageClassifier.create(
-        model_spec=image_classifier.SupportedModels.EFFICIENTNET_LITE0,
-        train_data=self.train_data,
-        hparams=hparams,
-        validation_data=self.test_data)
     self._test_accuracy(model)
 
     # Test export_model
     model.export_model()
-    output_metadata_file = os.path.join(hparams.model_dir, 'metadata.json')
+    output_metadata_file = os.path.join(options.hparams.export_dir,
-    output_tflite_file = os.path.join(hparams.model_dir, 'model.tflite')
+                                        'metadata.json')
+    output_tflite_file = os.path.join(options.hparams.export_dir,
+                                      'model.tflite')
     expected_metadata_file = test_utils.get_test_data_path('metadata.json')
 
     self.assertTrue(os.path.exists(output_tflite_file))
@@ -111,10 +135,50 @@ class ImageClassifierTest(tf.test.TestCase, parameterized.TestCase):
     self.assertGreater(os.path.getsize(output_metadata_file), 0)
     self.assertTrue(filecmp.cmp(output_metadata_file, expected_metadata_file))
 
+  def test_continual_training_by_loading_checkpoint(self):
+    mock_stdout = io.StringIO()
+    with mock.patch('sys.stdout', mock_stdout):
+      options = image_classifier.ImageClassifierOptions(
+          supported_model=image_classifier.SupportedModels.EFFICIENTNET_LITE0,
+          hparams=image_classifier.HParams(
+              epochs=5, batch_size=1, shuffle=True))
+      model = image_classifier.ImageClassifier.create(
+          train_data=self._train_data,
+          validation_data=self._test_data,
+          options=options)
+      model = image_classifier.ImageClassifier.create(
+          train_data=self._train_data,
+          validation_data=self._test_data,
+          options=options)
+      self._test_accuracy(model)
+
+    self.assertRegex(mock_stdout.getvalue(), 'Resuming from')
+
   def _test_accuracy(self, model, threshold=0.0):
-    _, accuracy = model.evaluate(self.test_data)
+    _, accuracy = model.evaluate(self._test_data)
     self.assertGreaterEqual(accuracy, threshold)
 
+  @unittest_mock.patch.object(
+      image_classifier.hyperparameters,
+      'HParams',
+      autospec=True,
+      return_value=image_classifier.HParams(epochs=1))
+  @unittest_mock.patch.object(
+      image_classifier.model_options,
+      'ImageClassifierModelOptions',
+      autospec=True,
+      return_value=image_classifier.ModelOptions())
+  def test_create_hparams_and_model_options_if_none_in_image_classifier_options(
+      self, mock_hparams, mock_model_options):
+    options = image_classifier.ImageClassifierOptions(
+        supported_model=(image_classifier.SupportedModels.EFFICIENTNET_LITE0))
+    image_classifier.ImageClassifier.create(
+        train_data=self._train_data,
+        validation_data=self._test_data,
+        options=options)
+    mock_hparams.assert_called_once()
+    mock_model_options.assert_called_once()
+
 
 if __name__ == '__main__':
   # Load compressed models from tensorflow_hub

mediapipe/model_maker/python/vision/image_classifier/model_options.py

@@ -0,0 +1,27 @@
+# Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Configurable model options for image classifier models."""
+
+import dataclasses
+
+
+@dataclasses.dataclass
+class ImageClassifierModelOptions:
+  """Configurable options for image classifier model.
+
+  Attributes:
+    dropout_rate: The fraction of the input units to drop, used in dropout
+      layer.
+  """
+  dropout_rate: float = 0.2

mediapipe/model_maker/python/vision/image_classifier/train_image_classifier_lib.py

@@ -14,8 +14,6 @@
 """Library to train model."""
 
 import os
-from typing import List
-
 import tensorflow as tf
 
 from mediapipe.model_maker.python.core.utils import model_util
@@ -49,18 +47,6 @@ def _create_optimizer(init_lr: float, decay_steps: int,
   return optimizer
 
 
-def _get_default_callbacks(model_dir: str) -> List[tf.keras.callbacks.Callback]:
-  """Gets default callbacks."""
-  summary_dir = os.path.join(model_dir, 'summaries')
-  summary_callback = tf.keras.callbacks.TensorBoard(summary_dir)
-  # Save checkpoint every 20 epochs.
-
-  checkpoint_path = os.path.join(model_dir, 'checkpoint')
-  checkpoint_callback = tf.keras.callbacks.ModelCheckpoint(
-      checkpoint_path, save_weights_only=True, period=20)
-  return [summary_callback, checkpoint_callback]
-
-
 def train_model(model: tf.keras.Model, hparams: hp.HParams,
                 train_ds: tf.data.Dataset,
                 validation_ds: tf.data.Dataset) -> tf.keras.callbacks.History:
@@ -81,7 +67,8 @@ def train_model(model: tf.keras.Model, hparams: hp.HParams,
   learning_rate = hparams.learning_rate * hparams.batch_size / 256
 
   # Get decay steps.
-  total_training_steps = hparams.steps_per_epoch * hparams.train_epochs
+  # NOMUTANTS--(b/256493858):Plan to test it in the unified training library.
+  total_training_steps = hparams.steps_per_epoch * hparams.epochs
   default_decay_steps = hparams.decay_samples // hparams.batch_size
   decay_steps = max(total_training_steps, default_decay_steps)
 
@@ -92,11 +79,24 @@ def train_model(model: tf.keras.Model, hparams: hp.HParams,
   loss = tf.keras.losses.CategoricalCrossentropy(
       label_smoothing=hparams.label_smoothing)
   model.compile(optimizer=optimizer, loss=loss, metrics=['accuracy'])
-  callbacks = _get_default_callbacks(hparams.model_dir)
+
+  summary_dir = os.path.join(hparams.export_dir, 'summaries')
+  summary_callback = tf.keras.callbacks.TensorBoard(summary_dir)
+  # Save checkpoint every 5 epochs.
+  checkpoint_path = os.path.join(hparams.export_dir, 'checkpoint')
+  checkpoint_callback = tf.keras.callbacks.ModelCheckpoint(
+      os.path.join(checkpoint_path, 'model-{epoch:04d}'),
+      save_weights_only=True,
+      period=5)
+
+  latest_checkpoint = tf.train.latest_checkpoint(checkpoint_path)
+  if latest_checkpoint:
+    print(f'Resuming from {latest_checkpoint}')
+    model.load_weights(latest_checkpoint)
 
   # Train the model.
   return model.fit(
       x=train_ds,
-      epochs=hparams.train_epochs,
+      epochs=hparams.epochs,
       validation_data=validation_ds,
-      callbacks=callbacks)
+      callbacks=[summary_callback, checkpoint_callback])

mediapipe/python/BUILD

@@ -87,7 +87,6 @@ cc_library(
 cc_library(
     name = "builtin_task_graphs",
     deps = [
-        "//mediapipe/tasks/cc/audio/audio_classifier:audio_classifier_graph",
         "//mediapipe/tasks/cc/vision/gesture_recognizer:gesture_recognizer_graph",
         "//mediapipe/tasks/cc/vision/image_classifier:image_classifier_graph",
         "//mediapipe/tasks/cc/vision/image_segmenter:image_segmenter_graph",
@@ -95,8 +94,10 @@ cc_library(
         "//mediapipe/tasks/cc/vision/image_embedder:image_embedder_graph",
     ] + select({
         # TODO: Build text_classifier_graph on Windows.
+        # TODO: Build audio_classifier_graph on Windows.
         "//mediapipe:windows": [],
         "//conditions:default": [
+            "//mediapipe/tasks/cc/audio/audio_classifier:audio_classifier_graph",
             "//mediapipe/tasks/cc/text/text_classifier:text_classifier_graph",
         ],
     }),

mediapipe/tasks/cc/components/containers/BUILD

@@ -30,6 +30,15 @@ cc_library(
     ],
 )
 
+cc_library(
+    name = "hand_landmarks_detection_result",
+    hdrs = ["hand_landmarks_detection_result.h"],
+    deps = [
+        "//mediapipe/framework/formats:classification_cc_proto",
+        "//mediapipe/framework/formats:landmark_cc_proto",
+    ],
+)
+
 cc_library(
     name = "category",
     srcs = ["category.cc"],

mediapipe/tasks/cc/components/containers/hand_landmarks_detection_result.h

@@ -0,0 +1,43 @@
+/* Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#ifndef MEDIAPIPE_TASKS_CC_COMPONENTS_CONTAINERS_HAND_LANDMARKS_DETECTION_RESULT_H_
+#define MEDIAPIPE_TASKS_CC_COMPONENTS_CONTAINERS_HAND_LANDMARKS_DETECTION_RESULT_H_
+
+#include "mediapipe/framework/formats/classification.pb.h"
+#include "mediapipe/framework/formats/landmark.pb.h"
+
+namespace mediapipe {
+namespace tasks {
+namespace components {
+namespace containers {
+
+// The hand landmarks detection result from HandLandmarker, where each vector
+// element represents a single hand detected in the image.
+struct HandLandmarksDetectionResult {
+  // Classification of handedness.
+  std::vector<mediapipe::ClassificationList> handedness;
+  // Detected hand landmarks in normalized image coordinates.
+  std::vector<mediapipe::NormalizedLandmarkList> hand_landmarks;
+  // Detected hand landmarks in world coordinates.
+  std::vector<mediapipe::LandmarkList> hand_world_landmarks;
+};
+
+}  // namespace containers
+}  // namespace components
+}  // namespace tasks
+}  // namespace mediapipe
+
+#endif  // MEDIAPIPE_TASKS_CC_COMPONENTS_CONTAINERS_HAND_LANDMARKS_DETECTION_RESULT_H_

mediapipe/tasks/cc/components/proto/segmenter_options.proto

@@ -17,6 +17,9 @@ syntax = "proto2";
 
 package mediapipe.tasks.components.proto;
 
+option java_package = "com.google.mediapipe.tasks.components.proto";
+option java_outer_classname = "SegmenterOptionsProto";
+
 // Shared options used by image segmentation tasks.
 message SegmenterOptions {
   // Optional output mask type.

mediapipe/tasks/cc/text/text_embedder/BUILD

@@ -0,0 +1,87 @@
+# Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+package(default_visibility = ["//mediapipe/tasks:internal"])
+
+licenses(["notice"])
+
+cc_library(
+    name = "text_embedder",
+    srcs = ["text_embedder.cc"],
+    hdrs = ["text_embedder.h"],
+    deps = [
+        ":text_embedder_graph",
+        "//mediapipe/calculators/tensor:inference_calculator_cc_proto",
+        "//mediapipe/framework:calculator_cc_proto",
+        "//mediapipe/framework/api2:builder",
+        "//mediapipe/tasks/cc/components/containers:embedding_result",
+        "//mediapipe/tasks/cc/components/containers/proto:embeddings_cc_proto",
+        "//mediapipe/tasks/cc/components/processors:embedder_options",
+        "//mediapipe/tasks/cc/components/processors/proto:embedder_options_cc_proto",
+        "//mediapipe/tasks/cc/components/utils:cosine_similarity",
+        "//mediapipe/tasks/cc/core:base_options",
+        "//mediapipe/tasks/cc/core:base_task_api",
+        "//mediapipe/tasks/cc/core:task_api_factory",
+        "//mediapipe/tasks/cc/core/proto:base_options_cc_proto",
+        "//mediapipe/tasks/cc/text/text_embedder/proto:text_embedder_graph_options_cc_proto",
+        "@com_google_absl//absl/status",
+        "@com_google_absl//absl/status:statusor",
+        "@com_google_absl//absl/strings",
+    ],
+)
+
+cc_library(
+    name = "text_embedder_graph",
+    srcs = ["text_embedder_graph.cc"],
+    deps = [
+        "//mediapipe/calculators/tensor:inference_calculator",
+        "//mediapipe/calculators/tensor:inference_calculator_cc_proto",
+        "//mediapipe/framework:calculator_cc_proto",
+        "//mediapipe/framework:calculator_framework",
+        "//mediapipe/framework/api2:builder",
+        "//mediapipe/framework/api2:port",
+        "//mediapipe/tasks/cc/components:text_preprocessing_graph",
+        "//mediapipe/tasks/cc/components/containers/proto:embeddings_cc_proto",
+        "//mediapipe/tasks/cc/components/processors:embedding_postprocessing_graph",
+        "//mediapipe/tasks/cc/components/processors/proto:embedding_postprocessing_graph_options_cc_proto",
+        "//mediapipe/tasks/cc/components/proto:text_preprocessing_graph_options_cc_proto",
+        "//mediapipe/tasks/cc/core:model_resources",
+        "//mediapipe/tasks/cc/core:model_task_graph",
+        "//mediapipe/tasks/cc/core/proto:model_resources_calculator_cc_proto",
+        "//mediapipe/tasks/cc/text/text_embedder/proto:text_embedder_graph_options_cc_proto",
+        "@com_google_absl//absl/status",
+        "@com_google_absl//absl/status:statusor",
+    ],
+    alwayslink = 1,
+)
+
+cc_test(
+    name = "text_embedder_test",
+    srcs = ["text_embedder_test.cc"],
+    data = [
+        "//mediapipe/tasks/testdata/text:mobilebert_embedding_model",
+        "//mediapipe/tasks/testdata/text:regex_embedding_with_metadata",
+    ],
+    deps = [
+        ":text_embedder",
+        "//mediapipe/framework/deps:file_path",
+        "//mediapipe/framework/port:gtest_main",
+        "//mediapipe/tasks/cc:common",
+        "//mediapipe/tasks/cc/components/containers:embedding_result",
+        "@com_google_absl//absl/flags:flag",
+        "@com_google_absl//absl/status",
+        "@com_google_absl//absl/status:statusor",
+        "@org_tensorflow//tensorflow/lite/core/shims:cc_shims_test_util",
+    ],
+)

mediapipe/tasks/cc/text/text_embedder/proto/BUILD

@@ -0,0 +1,30 @@
+# Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+load("//mediapipe/framework/port:build_config.bzl", "mediapipe_proto_library")
+
+package(default_visibility = ["//mediapipe/tasks:internal"])
+
+licenses(["notice"])
+
+mediapipe_proto_library(
+    name = "text_embedder_graph_options_proto",
+    srcs = ["text_embedder_graph_options.proto"],
+    deps = [
+        "//mediapipe/framework:calculator_options_proto",
+        "//mediapipe/framework:calculator_proto",
+        "//mediapipe/tasks/cc/components/processors/proto:embedder_options_proto",
+        "//mediapipe/tasks/cc/core/proto:base_options_proto",
+    ],
+)

mediapipe/tasks/cc/text/text_embedder/proto/text_embedder_graph_options.proto

@@ -0,0 +1,36 @@
+/* Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+syntax = "proto2";
+
+package mediapipe.tasks.text.text_embedder.proto;
+
+import "mediapipe/framework/calculator.proto";
+import "mediapipe/tasks/cc/components/processors/proto/embedder_options.proto";
+import "mediapipe/tasks/cc/core/proto/base_options.proto";
+
+message TextEmbedderGraphOptions {
+  extend mediapipe.CalculatorOptions {
+    optional TextEmbedderGraphOptions ext = 477589892;
+  }
+
+  // Base options for configuring MediaPipe Tasks, such as specifying the TfLite
+  // model file with metadata, accelerator options, etc.
+  optional core.proto.BaseOptions base_options = 1;
+
+  // Options for configuring the embedder behavior, such as normalization or
+  // quantization.
+  optional components.processors.proto.EmbedderOptions embedder_options = 2;
+}

mediapipe/tasks/cc/text/text_embedder/text_embedder.cc

@@ -0,0 +1,104 @@
+/* Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#include "mediapipe/tasks/cc/text/text_embedder/text_embedder.h"
+
+#include <memory>
+
+#include "absl/status/statusor.h"
+#include "mediapipe/calculators/tensor/inference_calculator.pb.h"
+#include "mediapipe/framework/api2/builder.h"
+#include "mediapipe/framework/calculator.pb.h"
+#include "mediapipe/tasks/cc/components/containers/embedding_result.h"
+#include "mediapipe/tasks/cc/components/containers/proto/embeddings.pb.h"
+#include "mediapipe/tasks/cc/components/processors/embedder_options.h"
+#include "mediapipe/tasks/cc/components/processors/proto/embedder_options.pb.h"
+#include "mediapipe/tasks/cc/components/utils/cosine_similarity.h"
+#include "mediapipe/tasks/cc/core/base_options.h"
+#include "mediapipe/tasks/cc/core/proto/base_options.pb.h"
+#include "mediapipe/tasks/cc/core/task_api_factory.h"
+#include "mediapipe/tasks/cc/text/text_embedder/proto/text_embedder_graph_options.pb.h"
+
+namespace mediapipe::tasks::text::text_embedder {
+namespace {
+
+constexpr char kTextTag[] = "TEXT";
+constexpr char kEmbeddingsTag[] = "EMBEDDINGS";
+constexpr char kTextInStreamName[] = "text_in";
+constexpr char kEmbeddingsStreamName[] = "embeddings_out";
+constexpr char kGraphTypeName[] =
+    "mediapipe.tasks.text.text_embedder.TextEmbedderGraph";
+
+using ::mediapipe::tasks::components::containers::ConvertToEmbeddingResult;
+using ::mediapipe::tasks::components::containers::proto::EmbeddingResult;
+
+// Creates a MediaPipe graph config that contains a single node of type
+// "mediapipe.tasks.text.text_embedder.TextEmbedderGraph".
+CalculatorGraphConfig CreateGraphConfig(
+    std::unique_ptr<proto::TextEmbedderGraphOptions> options_proto) {
+  api2::builder::Graph graph;
+  auto& task_graph = graph.AddNode(kGraphTypeName);
+  task_graph.GetOptions<proto::TextEmbedderGraphOptions>().Swap(
+      options_proto.get());
+  graph.In(kTextTag).SetName(kTextInStreamName) >> task_graph.In(kTextTag);
+  task_graph.Out(kEmbeddingsTag).SetName(kEmbeddingsStreamName) >>
+      graph.Out(kEmbeddingsTag);
+  return graph.GetConfig();
+}
+
+// Converts the user-facing TextEmbedderOptions struct to the internal
+// TextEmbedderGraphOptions proto.
+std::unique_ptr<proto::TextEmbedderGraphOptions>
+ConvertTextEmbedderOptionsToProto(TextEmbedderOptions* options) {
+  auto options_proto = std::make_unique<proto::TextEmbedderGraphOptions>();
+  auto base_options_proto = std::make_unique<tasks::core::proto::BaseOptions>(
+      tasks::core::ConvertBaseOptionsToProto(&(options->base_options)));
+  options_proto->mutable_base_options()->Swap(base_options_proto.get());
+  auto embedder_options_proto =
+      std::make_unique<components::processors::proto::EmbedderOptions>(
+          components::processors::ConvertEmbedderOptionsToProto(
+              &(options->embedder_options)));
+  options_proto->mutable_embedder_options()->Swap(embedder_options_proto.get());
+  return options_proto;
+}
+
+}  // namespace
+
+absl::StatusOr<std::unique_ptr<TextEmbedder>> TextEmbedder::Create(
+    std::unique_ptr<TextEmbedderOptions> options) {
+  std::unique_ptr<proto::TextEmbedderGraphOptions> options_proto =
+      ConvertTextEmbedderOptionsToProto(options.get());
+  return core::TaskApiFactory::Create<TextEmbedder,
+                                      proto::TextEmbedderGraphOptions>(
+      CreateGraphConfig(std::move(options_proto)),
+      std::move(options->base_options.op_resolver));
+}
+
+absl::StatusOr<TextEmbedderResult> TextEmbedder::Embed(absl::string_view text) {
+  ASSIGN_OR_RETURN(
+      auto output_packets,
+      runner_->Process(
+          {{kTextInStreamName, MakePacket<std::string>(std::string(text))}}));
+  return ConvertToEmbeddingResult(
+      output_packets[kEmbeddingsStreamName].Get<EmbeddingResult>());
+}
+
+absl::StatusOr<double> TextEmbedder::CosineSimilarity(
+    const components::containers::Embedding& u,
+    const components::containers::Embedding& v) {
+  return components::utils::CosineSimilarity(u, v);
+}
+
+}  // namespace mediapipe::tasks::text::text_embedder

mediapipe/tasks/cc/text/text_embedder/text_embedder.h

@@ -0,0 +1,96 @@
+/* Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#ifndef MEDIAPIPE_TASKS_CC_TEXT_TEXT_EMBEDDER_TEXT_EMBEDDER_H_
+#define MEDIAPIPE_TASKS_CC_TEXT_TEXT_EMBEDDER_TEXT_EMBEDDER_H_
+
+#include <memory>
+
+#include "absl/status/status.h"
+#include "absl/status/statusor.h"
+#include "absl/strings/string_view.h"
+#include "mediapipe/tasks/cc/components/containers/embedding_result.h"
+#include "mediapipe/tasks/cc/components/processors/embedder_options.h"
+#include "mediapipe/tasks/cc/core/base_options.h"
+#include "mediapipe/tasks/cc/core/base_task_api.h"
+
+namespace mediapipe::tasks::text::text_embedder {
+
+// Alias the shared EmbeddingResult struct as result typo.
+using TextEmbedderResult =
+    ::mediapipe::tasks::components::containers::EmbeddingResult;
+
+// Options for configuring a MediaPipe text embedder task.
+struct TextEmbedderOptions {
+  // Base options for configuring MediaPipe Tasks, such as specifying the model
+  // file with metadata, accelerator options, op resolver, etc.
+  tasks::core::BaseOptions base_options;
+
+  // Options for configuring the embedder behavior, such as L2-normalization or
+  // scalar-quantization.
+  components::processors::EmbedderOptions embedder_options;
+};
+
+// Performs embedding extraction on text.
+//
+// This API expects a TFLite model with TFLite Model Metadata that contains the
+// mandatory (described below) input tensors and output tensors. Metadata should
+// contain the input process unit for the model's Tokenizer as well as input /
+// output tensor metadata.
+//
+// TODO: Support Universal Sentence Encoder.
+// Input tensors:
+//   (kTfLiteInt32)
+//    - 3 input tensors of size `[batch_size x bert_max_seq_len]` with names
+//    "ids", "mask", and "segment_ids" representing the input ids, mask ids, and
+//    segment ids respectively
+//    - or 1 input tensor of size `[batch_size x max_seq_len]` representing the
+//      input ids
+//
+// At least one output tensor with:
+//   (kTfLiteFloat32)
+//    - `N` components corresponding to the `N` dimensions of the returned
+//      feature vector for this output layer.
+//    - Either 2 or 4 dimensions, i.e. `[1 x N]` or `[1 x 1 x 1 x N]`.
+class TextEmbedder : core::BaseTaskApi {
+ public:
+  using BaseTaskApi::BaseTaskApi;
+
+  // Creates a TextEmbedder from the provided `options`. A non-default
+  // OpResolver can be specified in the BaseOptions in order to support custom
+  // Ops or specify a subset of built-in Ops.
+  static absl::StatusOr<std::unique_ptr<TextEmbedder>> Create(
+      std::unique_ptr<TextEmbedderOptions> options);
+
+  // Performs embedding extraction on the input `text`.
+  absl::StatusOr<TextEmbedderResult> Embed(absl::string_view text);
+
+  // Shuts down the TextEmbedder when all the work is done.
+  absl::Status Close() { return runner_->Close(); }
+
+  // Utility function to compute cosine similarity [1] between two embeddings.
+  // May return an InvalidArgumentError if e.g. the embeddings are of different
+  // types (quantized vs. float), have different sizes, or have a an L2-norm of
+  // 0.
+  //
+  // [1]: https://en.wikipedia.org/wiki/Cosine_similarity
+  static absl::StatusOr<double> CosineSimilarity(
+      const components::containers::Embedding& u,
+      const components::containers::Embedding& v);
+};
+
+}  // namespace mediapipe::tasks::text::text_embedder
+
+#endif  // MEDIAPIPE_TASKS_CC_TEXT_TEXT_EMBEDDER_TEXT_EMBEDDER_H_

mediapipe/tasks/cc/text/text_embedder/text_embedder_graph.cc

@@ -0,0 +1,145 @@
+/* Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#include "absl/status/status.h"
+#include "absl/status/statusor.h"
+#include "mediapipe/calculators/tensor/inference_calculator.pb.h"
+#include "mediapipe/framework/api2/builder.h"
+#include "mediapipe/framework/api2/port.h"
+#include "mediapipe/framework/calculator.pb.h"
+#include "mediapipe/framework/calculator_framework.h"
+#include "mediapipe/tasks/cc/components/containers/proto/embeddings.pb.h"
+#include "mediapipe/tasks/cc/components/processors/embedding_postprocessing_graph.h"
+#include "mediapipe/tasks/cc/components/processors/proto/embedding_postprocessing_graph_options.pb.h"
+#include "mediapipe/tasks/cc/components/proto/text_preprocessing_graph_options.pb.h"
+#include "mediapipe/tasks/cc/components/text_preprocessing_graph.h"
+#include "mediapipe/tasks/cc/core/model_resources.h"
+#include "mediapipe/tasks/cc/core/model_task_graph.h"
+#include "mediapipe/tasks/cc/core/proto/model_resources_calculator.pb.h"
+#include "mediapipe/tasks/cc/text/text_embedder/proto/text_embedder_graph_options.pb.h"
+
+namespace mediapipe::tasks::text::text_embedder {
+namespace {
+
+using ::mediapipe::api2::Input;
+using ::mediapipe::api2::Output;
+using ::mediapipe::api2::builder::Graph;
+using ::mediapipe::api2::builder::Source;
+using ::mediapipe::tasks::components::containers::proto::EmbeddingResult;
+using ::mediapipe::tasks::core::ModelResources;
+
+constexpr char kEmbeddingsTag[] = "EMBEDDINGS";
+constexpr char kTextTag[] = "TEXT";
+constexpr char kMetadataExtractorTag[] = "METADATA_EXTRACTOR";
+constexpr char kTensorsTag[] = "TENSORS";
+
+}  // namespace
+
+// A "mediapipe.tasks.text.TextEmbedderGraph" performs text embedding
+// extraction.
+// - Accepts input text and outputs embeddings on CPU.
+//
+// Inputs:
+//   TEXT - std::string
+//     Input text to perform embedding extraction on.
+//
+// Outputs:
+//   EMBEDDINGS - EmbeddingResult
+//     The embedding result.
+//
+// Example:
+// node {
+//   calculator: "mediapipe.tasks.text.TextEmbedderGraph"
+//   input_stream: "TEXT:text_in"
+//   output_stream: "EMBEDDINGS:embedding_result_out"
+//   options {
+//     [mediapipe.tasks.text.text_embedder.proto.TextEmbedderGraphOptions.ext] {
+//       base_options {
+//         model_asset {
+//           file_name: "/path/to/model.tflite"
+//         }
+//       }
+//     }
+//   }
+// }
+class TextEmbedderGraph : public core::ModelTaskGraph {
+ public:
+  absl::StatusOr<CalculatorGraphConfig> GetConfig(
+      SubgraphContext* sc) override {
+    CHECK(sc != nullptr);
+    ASSIGN_OR_RETURN(const ModelResources* model_resources,
+                     CreateModelResources<proto::TextEmbedderGraphOptions>(sc));
+    Graph graph;
+    ASSIGN_OR_RETURN(
+        Source<EmbeddingResult> embedding_result_out,
+        BuildTextEmbedderTask(sc->Options<proto::TextEmbedderGraphOptions>(),
+                              *model_resources,
+                              graph[Input<std::string>(kTextTag)], graph));
+    embedding_result_out >> graph[Output<EmbeddingResult>(kEmbeddingsTag)];
+    return graph.GetConfig();
+  }
+
+ private:
+  // Adds a mediapipe TextEmbedder task graph into the provided
+  // builder::Graph instance. The TextEmbedder task takes an input
+  // text (std::string) and returns an embedding result.
+  //
+  // task_options: the mediapipe tasks TextEmbedderGraphOptions proto.
+  // model_resources: the ModelResources object initialized from a
+  //   TextEmbedder model file with model metadata.
+  // text_in: (std::string) stream to run embedding extraction on.
+  // graph: the mediapipe builder::Graph instance to be updated.
+  absl::StatusOr<Source<EmbeddingResult>> BuildTextEmbedderTask(
+      const proto::TextEmbedderGraphOptions& task_options,
+      const ModelResources& model_resources, Source<std::string> text_in,
+      Graph& graph) {
+    // Adds preprocessing calculators and connects them to the text input
+    // stream.
+    auto& preprocessing =
+        graph.AddNode("mediapipe.tasks.components.TextPreprocessingSubgraph");
+    MP_RETURN_IF_ERROR(components::ConfigureTextPreprocessingSubgraph(
+        model_resources,
+        preprocessing.GetOptions<
+            tasks::components::proto::TextPreprocessingGraphOptions>()));
+    text_in >> preprocessing.In(kTextTag);
+
+    // Adds both InferenceCalculator and ModelResourcesCalculator.
+    auto& inference = AddInference(
+        model_resources, task_options.base_options().acceleration(), graph);
+    // The metadata extractor side-output comes from the
+    // ModelResourcesCalculator.
+    inference.SideOut(kMetadataExtractorTag) >>
+        preprocessing.SideIn(kMetadataExtractorTag);
+    preprocessing.Out(kTensorsTag) >> inference.In(kTensorsTag);
+
+    // Adds postprocessing calculators and connects its input stream to the
+    // inference results.
+    auto& postprocessing = graph.AddNode(
+        "mediapipe.tasks.components.processors.EmbeddingPostprocessingGraph");
+    MP_RETURN_IF_ERROR(components::processors::ConfigureEmbeddingPostprocessing(
+        model_resources, task_options.embedder_options(),
+        &postprocessing.GetOptions<components::processors::proto::
+                                       EmbeddingPostprocessingGraphOptions>()));
+    inference.Out(kTensorsTag) >> postprocessing.In(kTensorsTag);
+
+    // Outputs the embedding result.
+    return postprocessing[Output<EmbeddingResult>(kEmbeddingsTag)];
+  }
+};
+
+REGISTER_MEDIAPIPE_GRAPH(
+    ::mediapipe::tasks::text::text_embedder::TextEmbedderGraph);
+
+}  // namespace mediapipe::tasks::text::text_embedder

mediapipe/tasks/cc/text/text_embedder/text_embedder_test.cc

@@ -0,0 +1,143 @@
+/* Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#include "mediapipe/tasks/cc/text/text_embedder/text_embedder.h"
+
+#include <memory>
+
+#include "absl/flags/flag.h"
+#include "absl/status/status.h"
+#include "absl/status/statusor.h"
+#include "mediapipe/framework/deps/file_path.h"
+#include "mediapipe/framework/port/gmock.h"
+#include "mediapipe/framework/port/gtest.h"
+#include "mediapipe/framework/port/status_matchers.h"
+#include "mediapipe/tasks/cc/common.h"
+#include "mediapipe/tasks/cc/components/containers/embedding_result.h"
+#include "tensorflow/lite/core/shims/cc/shims_test_util.h"
+
+namespace mediapipe::tasks::text::text_embedder {
+namespace {
+
+constexpr char kTestDataDirectory[] = "/mediapipe/tasks/testdata/text/";
+
+// Note that these models use dynamic-sized tensors.
+// Embedding model with BERT preprocessing.
+constexpr char kMobileBert[] = "mobilebert_embedding_with_metadata.tflite";
+// Embedding model with regex preprocessing.
+constexpr char kRegexOneEmbeddingModel[] =
+    "regex_one_embedding_with_metadata.tflite";
+
+// Tolerance for embedding vector coordinate values.
+constexpr float kEpsilon = 1e-4;
+// Tolerancy for cosine similarity evaluation.
+constexpr double kSimilarityTolerancy = 1e-6;
+
+using ::mediapipe::file::JoinPath;
+using ::testing::HasSubstr;
+using ::testing::Optional;
+
+class EmbedderTest : public tflite_shims::testing::Test {};
+
+TEST_F(EmbedderTest, FailsWithMissingModel) {
+  auto text_embedder =
+      TextEmbedder::Create(std::make_unique<TextEmbedderOptions>());
+  ASSERT_EQ(text_embedder.status().code(), absl::StatusCode::kInvalidArgument);
+  ASSERT_THAT(
+      text_embedder.status().message(),
+      HasSubstr("ExternalFile must specify at least one of 'file_content', "
+                "'file_name', 'file_pointer_meta' or 'file_descriptor_meta'."));
+  ASSERT_THAT(text_embedder.status().GetPayload(kMediaPipeTasksPayload),
+              Optional(absl::Cord(absl::StrCat(
+                  MediaPipeTasksStatus::kRunnerInitializationError))));
+}
+
+TEST_F(EmbedderTest, SucceedsWithMobileBert) {
+  auto options = std::make_unique<TextEmbedderOptions>();
+  options->base_options.model_asset_path =
+      JoinPath("./", kTestDataDirectory, kMobileBert);
+  MP_ASSERT_OK_AND_ASSIGN(std::unique_ptr<TextEmbedder> text_embedder,
+                          TextEmbedder::Create(std::move(options)));
+  MP_ASSERT_OK_AND_ASSIGN(
+      TextEmbedderResult result0,
+      text_embedder->Embed("it's a charming and often affecting journey"));
+  ASSERT_EQ(result0.embeddings.size(), 1);
+  ASSERT_EQ(result0.embeddings[0].float_embedding.size(), 512);
+  ASSERT_NEAR(result0.embeddings[0].float_embedding[0], 19.9016f, kEpsilon);
+
+  MP_ASSERT_OK_AND_ASSIGN(
+      auto result1, text_embedder->Embed("what a great and fantastic trip"));
+  ASSERT_EQ(result1.embeddings.size(), 1);
+  ASSERT_EQ(result1.embeddings[0].float_embedding.size(), 512);
+  ASSERT_NEAR(result1.embeddings[0].float_embedding[0], 22.626251f, kEpsilon);
+
+  // Check cosine similarity.
+  MP_ASSERT_OK_AND_ASSIGN(
+      double similarity, TextEmbedder::CosineSimilarity(result0.embeddings[0],
+                                                        result1.embeddings[0]));
+  EXPECT_NEAR(similarity, 0.969514, kSimilarityTolerancy);
+
+  MP_ASSERT_OK(text_embedder->Close());
+}
+
+TEST(EmbedTest, SucceedsWithRegexOneEmbeddingModel) {
+  auto options = std::make_unique<TextEmbedderOptions>();
+  options->base_options.model_asset_path =
+      JoinPath("./", kTestDataDirectory, kRegexOneEmbeddingModel);
+  MP_ASSERT_OK_AND_ASSIGN(std::unique_ptr<TextEmbedder> text_embedder,
+                          TextEmbedder::Create(std::move(options)));
+
+  MP_ASSERT_OK_AND_ASSIGN(
+      auto result0,
+      text_embedder->Embed("it's a charming and often affecting journey"));
+  EXPECT_EQ(result0.embeddings.size(), 1);
+  EXPECT_EQ(result0.embeddings[0].float_embedding.size(), 16);
+
+  EXPECT_NEAR(result0.embeddings[0].float_embedding[0], 0.0309356f, kEpsilon);
+
+  MP_ASSERT_OK_AND_ASSIGN(
+      auto result1, text_embedder->Embed("what a great and fantastic trip"));
+  EXPECT_EQ(result1.embeddings.size(), 1);
+  EXPECT_EQ(result1.embeddings[0].float_embedding.size(), 16);
+
+  EXPECT_NEAR(result1.embeddings[0].float_embedding[0], 0.0312863f, kEpsilon);
+
+  // Check cosine similarity.
+  MP_ASSERT_OK_AND_ASSIGN(
+      double similarity, TextEmbedder::CosineSimilarity(result0.embeddings[0],
+                                                        result1.embeddings[0]));
+  EXPECT_NEAR(similarity, 0.999937, kSimilarityTolerancy);
+
+  MP_ASSERT_OK(text_embedder->Close());
+}
+
+TEST_F(EmbedderTest, SucceedsWithQuantization) {
+  auto options = std::make_unique<TextEmbedderOptions>();
+  options->base_options.model_asset_path =
+      JoinPath("./", kTestDataDirectory, kMobileBert);
+  options->embedder_options.quantize = true;
+  MP_ASSERT_OK_AND_ASSIGN(std::unique_ptr<TextEmbedder> text_embedder,
+                          TextEmbedder::Create(std::move(options)));
+  MP_ASSERT_OK_AND_ASSIGN(
+      TextEmbedderResult result,
+      text_embedder->Embed("it's a charming and often affecting journey"));
+  ASSERT_EQ(result.embeddings.size(), 1);
+  ASSERT_EQ(result.embeddings[0].quantized_embedding.size(), 512);
+
+  MP_ASSERT_OK(text_embedder->Close());
+}
+
+}  // namespace
+}  // namespace mediapipe::tasks::text::text_embedder

mediapipe/tasks/cc/vision/hand_landmarker/BUILD

@@ -110,4 +110,38 @@ cc_library(
     alwayslink = 1,
 )
 
+cc_library(
+    name = "hand_landmarker",
+    srcs = ["hand_landmarker.cc"],
+    hdrs = ["hand_landmarker.h"],
+    deps = [
+        ":hand_landmarker_graph",
+        "//mediapipe/framework/api2:builder",
+        "//mediapipe/framework/api2:port",
+        "//mediapipe/framework/formats:classification_cc_proto",
+        "//mediapipe/framework/formats:image",
+        "//mediapipe/framework/formats:landmark_cc_proto",
+        "//mediapipe/framework/formats:rect_cc_proto",
+        "//mediapipe/tasks/cc:common",
+        "//mediapipe/tasks/cc/components:image_preprocessing",
+        "//mediapipe/tasks/cc/components/containers:hand_landmarks_detection_result",
+        "//mediapipe/tasks/cc/components/processors:classifier_options",
+        "//mediapipe/tasks/cc/components/processors/proto:classifier_options_cc_proto",
+        "//mediapipe/tasks/cc/core:base_options",
+        "//mediapipe/tasks/cc/core:base_task_api",
+        "//mediapipe/tasks/cc/core:model_resources",
+        "//mediapipe/tasks/cc/core:task_runner",
+        "//mediapipe/tasks/cc/core:utils",
+        "//mediapipe/tasks/cc/core/proto:inference_subgraph_cc_proto",
+        "//mediapipe/tasks/cc/vision/core:base_vision_task_api",
+        "//mediapipe/tasks/cc/vision/core:image_processing_options",
+        "//mediapipe/tasks/cc/vision/core:running_mode",
+        "//mediapipe/tasks/cc/vision/core:vision_task_api_factory",
+        "//mediapipe/tasks/cc/vision/hand_detector/proto:hand_detector_graph_options_cc_proto",
+        "//mediapipe/tasks/cc/vision/hand_landmarker/proto:hand_landmarker_graph_options_cc_proto",
+        "//mediapipe/tasks/cc/vision/hand_landmarker/proto:hand_landmarks_detector_graph_options_cc_proto",
+        "@com_google_absl//absl/status:statusor",
+    ],
+)
+
 # TODO: Enable this test

mediapipe/tasks/cc/vision/hand_landmarker/hand_landmarker.cc

@@ -0,0 +1,269 @@
+/* Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#include "mediapipe/tasks/cc/vision/hand_landmarker/hand_landmarker.h"
+
+#include "mediapipe/framework/api2/builder.h"
+#include "mediapipe/framework/api2/port.h"
+#include "mediapipe/framework/formats/classification.pb.h"
+#include "mediapipe/framework/formats/image.h"
+#include "mediapipe/framework/formats/landmark.pb.h"
+#include "mediapipe/framework/formats/rect.pb.h"
+#include "mediapipe/tasks/cc/common.h"
+#include "mediapipe/tasks/cc/components/containers/hand_landmarks_detection_result.h"
+#include "mediapipe/tasks/cc/components/image_preprocessing.h"
+#include "mediapipe/tasks/cc/components/processors/proto/classifier_options.pb.h"
+#include "mediapipe/tasks/cc/core/base_task_api.h"
+#include "mediapipe/tasks/cc/core/model_resources.h"
+#include "mediapipe/tasks/cc/core/proto/inference_subgraph.pb.h"
+#include "mediapipe/tasks/cc/core/task_runner.h"
+#include "mediapipe/tasks/cc/core/utils.h"
+#include "mediapipe/tasks/cc/vision/core/base_vision_task_api.h"
+#include "mediapipe/tasks/cc/vision/core/image_processing_options.h"
+#include "mediapipe/tasks/cc/vision/core/vision_task_api_factory.h"
+#include "mediapipe/tasks/cc/vision/hand_detector/proto/hand_detector_graph_options.pb.h"
+#include "mediapipe/tasks/cc/vision/hand_landmarker/proto/hand_landmarker_graph_options.pb.h"
+#include "mediapipe/tasks/cc/vision/hand_landmarker/proto/hand_landmarks_detector_graph_options.pb.h"
+
+namespace mediapipe {
+namespace tasks {
+namespace vision {
+namespace hand_landmarker {
+
+namespace {
+
+using HandLandmarkerGraphOptionsProto = ::mediapipe::tasks::vision::
+    hand_landmarker::proto::HandLandmarkerGraphOptions;
+
+using ::mediapipe::tasks::components::containers::HandLandmarksDetectionResult;
+
+constexpr char kHandLandmarkerGraphTypeName[] =
+    "mediapipe.tasks.vision.hand_landmarker.HandLandmarkerGraph";
+
+constexpr char kImageTag[] = "IMAGE";
+constexpr char kImageInStreamName[] = "image_in";
+constexpr char kImageOutStreamName[] = "image_out";
+constexpr char kNormRectTag[] = "NORM_RECT";
+constexpr char kNormRectStreamName[] = "norm_rect_in";
+constexpr char kHandednessTag[] = "HANDEDNESS";
+constexpr char kHandednessStreamName[] = "handedness";
+constexpr char kHandLandmarksTag[] = "LANDMARKS";
+constexpr char kHandLandmarksStreamName[] = "landmarks";
+constexpr char kHandWorldLandmarksTag[] = "WORLD_LANDMARKS";
+constexpr char kHandWorldLandmarksStreamName[] = "world_landmarks";
+constexpr int kMicroSecondsPerMilliSecond = 1000;
+
+// Creates a MediaPipe graph config that contains a subgraph node of
+// "mediapipe.tasks.vision.hand_ladnamrker.HandLandmarkerGraph". If the task is
+// running in the live stream mode, a "FlowLimiterCalculator" will be added to
+// limit the number of frames in flight.
+CalculatorGraphConfig CreateGraphConfig(
+    std::unique_ptr<HandLandmarkerGraphOptionsProto> options,
+    bool enable_flow_limiting) {
+  api2::builder::Graph graph;
+  auto& subgraph = graph.AddNode(kHandLandmarkerGraphTypeName);
+  subgraph.GetOptions<HandLandmarkerGraphOptionsProto>().Swap(options.get());
+  graph.In(kImageTag).SetName(kImageInStreamName);
+  graph.In(kNormRectTag).SetName(kNormRectStreamName);
+  subgraph.Out(kHandednessTag).SetName(kHandednessStreamName) >>
+      graph.Out(kHandednessTag);
+  subgraph.Out(kHandLandmarksTag).SetName(kHandLandmarksStreamName) >>
+      graph.Out(kHandLandmarksTag);
+  subgraph.Out(kHandWorldLandmarksTag).SetName(kHandWorldLandmarksStreamName) >>
+      graph.Out(kHandWorldLandmarksTag);
+  subgraph.Out(kImageTag).SetName(kImageOutStreamName) >> graph.Out(kImageTag);
+  if (enable_flow_limiting) {
+    return tasks::core::AddFlowLimiterCalculator(
+        graph, subgraph, {kImageTag, kNormRectTag}, kHandLandmarksTag);
+  }
+  graph.In(kImageTag) >> subgraph.In(kImageTag);
+  graph.In(kNormRectTag) >> subgraph.In(kNormRectTag);
+  return graph.GetConfig();
+}
+
+// Converts the user-facing HandLandmarkerOptions struct to the internal
+// HandLandmarkerGraphOptions proto.
+std::unique_ptr<HandLandmarkerGraphOptionsProto>
+ConvertHandLandmarkerGraphOptionsProto(HandLandmarkerOptions* options) {
+  auto options_proto = std::make_unique<HandLandmarkerGraphOptionsProto>();
+  auto base_options_proto = std::make_unique<tasks::core::proto::BaseOptions>(
+      tasks::core::ConvertBaseOptionsToProto(&(options->base_options)));
+  options_proto->mutable_base_options()->Swap(base_options_proto.get());
+  options_proto->mutable_base_options()->set_use_stream_mode(
+      options->running_mode != core::RunningMode::IMAGE);
+
+  // Configure hand detector options.
+  auto* hand_detector_graph_options =
+      options_proto->mutable_hand_detector_graph_options();
+  hand_detector_graph_options->set_num_hands(options->num_hands);
+  hand_detector_graph_options->set_min_detection_confidence(
+      options->min_hand_detection_confidence);
+
+  // Configure hand landmark detector options.
+  options_proto->set_min_tracking_confidence(options->min_tracking_confidence);
+  auto* hand_landmarks_detector_graph_options =
+      options_proto->mutable_hand_landmarks_detector_graph_options();
+  hand_landmarks_detector_graph_options->set_min_detection_confidence(
+      options->min_hand_presence_confidence);
+
+  return options_proto;
+}
+
+}  // namespace
+
+absl::StatusOr<std::unique_ptr<HandLandmarker>> HandLandmarker::Create(
+    std::unique_ptr<HandLandmarkerOptions> options) {
+  auto options_proto = ConvertHandLandmarkerGraphOptionsProto(options.get());
+  tasks::core::PacketsCallback packets_callback = nullptr;
+  if (options->result_callback) {
+    auto result_callback = options->result_callback;
+    packets_callback = [=](absl::StatusOr<tasks::core::PacketMap>
+                               status_or_packets) {
+      if (!status_or_packets.ok()) {
+        Image image;
+        result_callback(status_or_packets.status(), image,
+                        Timestamp::Unset().Value());
+        return;
+      }
+      if (status_or_packets.value()[kImageOutStreamName].IsEmpty()) {
+        return;
+      }
+      Packet image_packet = status_or_packets.value()[kImageOutStreamName];
+      if (status_or_packets.value()[kHandLandmarksStreamName].IsEmpty()) {
+        Packet empty_packet =
+            status_or_packets.value()[kHandLandmarksStreamName];
+        result_callback(
+            {HandLandmarksDetectionResult()}, image_packet.Get<Image>(),
+            empty_packet.Timestamp().Value() / kMicroSecondsPerMilliSecond);
+        return;
+      }
+      Packet handedness_packet =
+          status_or_packets.value()[kHandednessStreamName];
+      Packet hand_landmarks_packet =
+          status_or_packets.value()[kHandLandmarksStreamName];
+      Packet hand_world_landmarks_packet =
+          status_or_packets.value()[kHandWorldLandmarksStreamName];
+      result_callback(
+          {{handedness_packet.Get<std::vector<ClassificationList>>(),
+            hand_landmarks_packet.Get<std::vector<NormalizedLandmarkList>>(),
+            hand_world_landmarks_packet.Get<std::vector<LandmarkList>>()}},
+          image_packet.Get<Image>(),
+          hand_landmarks_packet.Timestamp().Value() /
+              kMicroSecondsPerMilliSecond);
+    };
+  }
+  return core::VisionTaskApiFactory::Create<HandLandmarker,
+                                            HandLandmarkerGraphOptionsProto>(
+      CreateGraphConfig(
+          std::move(options_proto),
+          options->running_mode == core::RunningMode::LIVE_STREAM),
+      std::move(options->base_options.op_resolver), options->running_mode,
+      std::move(packets_callback));
+}
+
+absl::StatusOr<HandLandmarksDetectionResult> HandLandmarker::Detect(
+    mediapipe::Image image,
+    std::optional<core::ImageProcessingOptions> image_processing_options) {
+  if (image.UsesGpu()) {
+    return CreateStatusWithPayload(
+        absl::StatusCode::kInvalidArgument,
+        "GPU input images are currently not supported.",
+        MediaPipeTasksStatus::kRunnerUnexpectedInputError);
+  }
+  ASSIGN_OR_RETURN(
+      NormalizedRect norm_rect,
+      ConvertToNormalizedRect(image_processing_options, /*roi_allowed=*/false));
+  ASSIGN_OR_RETURN(
+      auto output_packets,
+      ProcessImageData(
+          {{kImageInStreamName, MakePacket<Image>(std::move(image))},
+           {kNormRectStreamName,
+            MakePacket<NormalizedRect>(std::move(norm_rect))}}));
+  if (output_packets[kHandLandmarksStreamName].IsEmpty()) {
+    return {HandLandmarksDetectionResult()};
+  }
+  return {{/* handedness= */
+           {output_packets[kHandednessStreamName]
+                .Get<std::vector<mediapipe::ClassificationList>>()},
+           /* hand_landmarks= */
+           {output_packets[kHandLandmarksStreamName]
+                .Get<std::vector<mediapipe::NormalizedLandmarkList>>()},
+           /* hand_world_landmarks */
+           {output_packets[kHandWorldLandmarksStreamName]
+                .Get<std::vector<mediapipe::LandmarkList>>()}}};
+}
+
+absl::StatusOr<HandLandmarksDetectionResult> HandLandmarker::DetectForVideo(
+    mediapipe::Image image, int64 timestamp_ms,
+    std::optional<core::ImageProcessingOptions> image_processing_options) {
+  if (image.UsesGpu()) {
+    return CreateStatusWithPayload(
+        absl::StatusCode::kInvalidArgument,
+        absl::StrCat("GPU input images are currently not supported."),
+        MediaPipeTasksStatus::kRunnerUnexpectedInputError);
+  }
+  ASSIGN_OR_RETURN(
+      NormalizedRect norm_rect,
+      ConvertToNormalizedRect(image_processing_options, /*roi_allowed=*/false));
+  ASSIGN_OR_RETURN(
+      auto output_packets,
+      ProcessVideoData(
+          {{kImageInStreamName,
+            MakePacket<Image>(std::move(image))
+                .At(Timestamp(timestamp_ms * kMicroSecondsPerMilliSecond))},
+           {kNormRectStreamName,
+            MakePacket<NormalizedRect>(std::move(norm_rect))
+                .At(Timestamp(timestamp_ms * kMicroSecondsPerMilliSecond))}}));
+  if (output_packets[kHandLandmarksStreamName].IsEmpty()) {
+    return {HandLandmarksDetectionResult()};
+  }
+  return {
+      {/* handedness= */
+       {output_packets[kHandednessStreamName]
+            .Get<std::vector<mediapipe::ClassificationList>>()},
+       /* hand_landmarks= */
+       {output_packets[kHandLandmarksStreamName]
+            .Get<std::vector<mediapipe::NormalizedLandmarkList>>()},
+       /* hand_world_landmarks */
+       {output_packets[kHandWorldLandmarksStreamName]
+            .Get<std::vector<mediapipe::LandmarkList>>()}},
+  };
+}
+
+absl::Status HandLandmarker::DetectAsync(
+    mediapipe::Image image, int64 timestamp_ms,
+    std::optional<core::ImageProcessingOptions> image_processing_options) {
+  if (image.UsesGpu()) {
+    return CreateStatusWithPayload(
+        absl::StatusCode::kInvalidArgument,
+        absl::StrCat("GPU input images are currently not supported."),
+        MediaPipeTasksStatus::kRunnerUnexpectedInputError);
+  }
+  ASSIGN_OR_RETURN(
+      NormalizedRect norm_rect,
+      ConvertToNormalizedRect(image_processing_options, /*roi_allowed=*/false));
+  return SendLiveStreamData(
+      {{kImageInStreamName,
+        MakePacket<Image>(std::move(image))
+            .At(Timestamp(timestamp_ms * kMicroSecondsPerMilliSecond))},
+       {kNormRectStreamName,
+        MakePacket<NormalizedRect>(std::move(norm_rect))
+            .At(Timestamp(timestamp_ms * kMicroSecondsPerMilliSecond))}});
+}
+
+}  // namespace hand_landmarker
+}  // namespace vision
+}  // namespace tasks
+}  // namespace mediapipe

mediapipe/tasks/cc/vision/hand_landmarker/hand_landmarker.h

@@ -0,0 +1,192 @@
+/* Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#ifndef MEDIAPIPE_TASKS_CC_VISION_HAND_LANDMARKER_HAND_LANDMARKER_H_
+#define MEDIAPIPE_TASKS_CC_VISION_HAND_LANDMARKER_HAND_LANDMARKER_H_
+
+#include <memory>
+#include <optional>
+#include <vector>
+
+#include "absl/status/statusor.h"
+#include "mediapipe/framework/formats/classification.pb.h"
+#include "mediapipe/framework/formats/image.h"
+#include "mediapipe/framework/formats/landmark.pb.h"
+#include "mediapipe/tasks/cc/components/containers/hand_landmarks_detection_result.h"
+#include "mediapipe/tasks/cc/components/processors/classifier_options.h"
+#include "mediapipe/tasks/cc/core/base_options.h"
+#include "mediapipe/tasks/cc/vision/core/base_vision_task_api.h"
+#include "mediapipe/tasks/cc/vision/core/image_processing_options.h"
+#include "mediapipe/tasks/cc/vision/core/running_mode.h"
+
+namespace mediapipe {
+namespace tasks {
+namespace vision {
+namespace hand_landmarker {
+
+struct HandLandmarkerOptions {
+  // Base options for configuring MediaPipe Tasks library, such as specifying
+  // the TfLite model bundle file with metadata, accelerator options, op
+  // resolver, etc.
+  tasks::core::BaseOptions base_options;
+
+  // The running mode of the task. Default to the image mode.
+  // HandLandmarker has three running modes:
+  // 1) The image mode for detecting hand landmarks on single image inputs.
+  // 2) The video mode for detecting hand landmarks on the decoded frames of a
+  //    video.
+  // 3) The live stream mode for detecting hand landmarks on the live stream of
+  //    input data, such as from camera. In this mode, the "result_callback"
+  //    below must be specified to receive the detection results asynchronously.
+  core::RunningMode running_mode = core::RunningMode::IMAGE;
+
+  // The maximum number of hands can be detected by the HandLandmarker.
+  int num_hands = 1;
+
+  // The minimum confidence score for the hand detection to be considered
+  // successful.
+  float min_hand_detection_confidence = 0.5;
+
+  // The minimum confidence score of hand presence score in the hand landmark
+  // detection.
+  float min_hand_presence_confidence = 0.5;
+
+  // The minimum confidence score for the hand tracking to be considered
+  // successful.
+  float min_tracking_confidence = 0.5;
+
+  // The user-defined result callback for processing live stream data.
+  // The result callback should only be specified when the running mode is set
+  // to RunningMode::LIVE_STREAM.
+  std::function<void(
+      absl::StatusOr<components::containers::HandLandmarksDetectionResult>,
+      const Image&, int64)>
+      result_callback = nullptr;
+};
+
+// Performs hand landmarks detection on the given image.
+//
+// TODO  add the link to DevSite.
+// This API expects a pre-trained hand landmarker model asset bundle.
+//
+// Inputs:
+//   Image
+//     - The image that hand landmarks detection runs on.
+//   std::optional<NormalizedRect>
+//     - If provided, can be used to specify the rotation to apply to the image
+//       before performing hand landmarks detection, by setting its 'rotation'
+//       field in radians (e.g. 'M_PI / 2' for a 90° anti-clockwise rotation).
+//       Note that specifying a region-of-interest using the 'x_center',
+//       'y_center', 'width' and 'height' fields is NOT supported and will
+//       result in an invalid argument error being returned.
+// Outputs:
+//   HandLandmarksDetectionResult
+//     - The hand landmarks detection results.
+class HandLandmarker : tasks::vision::core::BaseVisionTaskApi {
+ public:
+  using BaseVisionTaskApi::BaseVisionTaskApi;
+
+  // Creates a HandLandmarker from a HandLandmarkerOptions to process image data
+  // or streaming data. Hand landmarker can be created with one of the following
+  // three running modes:
+  // 1) Image mode for detecting hand landmarks on single image inputs. Users
+  //    provide mediapipe::Image to the `Detect` method, and will receive the
+  //    deteced hand landmarks results as the return value.
+  // 2) Video mode for detecting hand landmarks on the decoded frames of a
+  //    video. Users call `DetectForVideo` method, and will receive the detected
+  //    hand landmarks results as the return value.
+  // 3) Live stream mode for detecting hand landmarks on the live stream of the
+  //    input data, such as from camera. Users call `DetectAsync` to push the
+  //    image data into the HandLandmarker, the detected results along with the
+  //    input timestamp and the image that hand landmarker runs on will be
+  //    available in the result callback when the hand landmarker finishes the
+  //    work.
+  static absl::StatusOr<std::unique_ptr<HandLandmarker>> Create(
+      std::unique_ptr<HandLandmarkerOptions> options);
+
+  // Performs hand landmarks detection on the given image.
+  // Only use this method when the HandLandmarker is created with the image
+  // running mode.
+  //
+  // The optional 'image_processing_options' parameter can be used to specify
+  // the rotation to apply to the image before performing detection, by setting
+  // its 'rotation_degrees' field. Note that specifying a region-of-interest
+  // using the 'region_of_interest' field is NOT supported and will result in an
+  // invalid argument error being returned.
+  //
+  // The image can be of any size with format RGB or RGBA.
+  // TODO: Describes how the input image will be preprocessed
+  // after the yuv support is implemented.
+  absl::StatusOr<components::containers::HandLandmarksDetectionResult> Detect(
+      Image image,
+      std::optional<core::ImageProcessingOptions> image_processing_options =
+          std::nullopt);
+
+  // Performs hand landmarks detection on the provided video frame.
+  // Only use this method when the HandLandmarker is created with the video
+  // running mode.
+  //
+  // The optional 'image_processing_options' parameter can be used to specify
+  // the rotation to apply to the image before performing detection, by setting
+  // its 'rotation_degrees' field. Note that specifying a region-of-interest
+  // using the 'region_of_interest' field is NOT supported and will result in an
+  // invalid argument error being returned.
+  //
+  // The image can be of any size with format RGB or RGBA. It's required to
+  // provide the video frame's timestamp (in milliseconds). The input timestamps
+  // must be monotonically increasing.
+  absl::StatusOr<components::containers::HandLandmarksDetectionResult>
+  DetectForVideo(Image image, int64 timestamp_ms,
+                 std::optional<core::ImageProcessingOptions>
+                     image_processing_options = std::nullopt);
+
+  // Sends live image data to perform hand landmarks detection, and the results
+  // will be available via the "result_callback" provided in the
+  // HandLandmarkerOptions. Only use this method when the HandLandmarker
+  // is created with the live stream running mode.
+  //
+  // The image can be of any size with format RGB or RGBA. It's required to
+  // provide a timestamp (in milliseconds) to indicate when the input image is
+  // sent to the hand landmarker. The input timestamps must be monotonically
+  // increasing.
+  //
+  // The optional 'image_processing_options' parameter can be used to specify
+  // the rotation to apply to the image before performing detection, by setting
+  // its 'rotation_degrees' field. Note that specifying a region-of-interest
+  // using the 'region_of_interest' field is NOT supported and will result in an
+  // invalid argument error being returned.
+  //
+  // The "result_callback" provides
+  //   - A vector of HandLandmarksDetectionResult, each is the detected results
+  //     for a input frame.
+  //   - The const reference to the corresponding input image that the hand
+  //     landmarker runs on. Note that the const reference to the image will no
+  //     longer be valid when the callback returns. To access the image data
+  //     outside of the callback, callers need to make a copy of the image.
+  //   - The input timestamp in milliseconds.
+  absl::Status DetectAsync(Image image, int64 timestamp_ms,
+                           std::optional<core::ImageProcessingOptions>
+                               image_processing_options = std::nullopt);
+
+  // Shuts down the HandLandmarker when all works are done.
+  absl::Status Close() { return runner_->Close(); }
+};
+
+}  // namespace hand_landmarker
+}  // namespace vision
+}  // namespace tasks
+}  // namespace mediapipe
+
+#endif  // MEDIAPIPE_TASKS_CC_VISION_HAND_LANDMARKER_HAND_LANDMARKER_H_

mediapipe/tasks/cc/vision/hand_landmarker/hand_landmarker_test.cc

@@ -0,0 +1,511 @@
+/* Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#include "mediapipe/tasks/cc/vision/hand_landmarker/hand_landmarker.h"
+
+#include <cmath>
+#include <memory>
+#include <string>
+#include <utility>
+
+#include "absl/flags/flag.h"
+#include "absl/status/status.h"
+#include "absl/status/statusor.h"
+#include "absl/strings/string_view.h"
+#include "mediapipe/framework/deps/file_path.h"
+#include "mediapipe/framework/formats/classification.pb.h"
+#include "mediapipe/framework/formats/image.h"
+#include "mediapipe/framework/formats/landmark.pb.h"
+#include "mediapipe/framework/port/file_helpers.h"
+#include "mediapipe/framework/port/gmock.h"
+#include "mediapipe/framework/port/gtest.h"
+#include "mediapipe/tasks/cc/common.h"
+#include "mediapipe/tasks/cc/components/containers/hand_landmarks_detection_result.h"
+#include "mediapipe/tasks/cc/components/containers/proto/landmarks_detection_result.pb.h"
+#include "mediapipe/tasks/cc/components/containers/rect.h"
+#include "mediapipe/tasks/cc/components/processors/proto/classifier_options.pb.h"
+#include "mediapipe/tasks/cc/core/base_options.h"
+#include "mediapipe/tasks/cc/vision/core/image_processing_options.h"
+#include "mediapipe/tasks/cc/vision/utils/image_utils.h"
+#include "tensorflow/lite/core/shims/cc/shims_test_util.h"
+
+namespace mediapipe {
+namespace tasks {
+namespace vision {
+namespace hand_landmarker {
+
+namespace {
+
+using ::file::Defaults;
+using ::mediapipe::file::JoinPath;
+using ::mediapipe::tasks::components::containers::HandLandmarksDetectionResult;
+using ::mediapipe::tasks::components::containers::Rect;
+using ::mediapipe::tasks::containers::proto::LandmarksDetectionResult;
+using ::mediapipe::tasks::vision::core::ImageProcessingOptions;
+using ::testing::EqualsProto;
+using ::testing::HasSubstr;
+using ::testing::Optional;
+using ::testing::Pointwise;
+using ::testing::TestParamInfo;
+using ::testing::TestWithParam;
+using ::testing::Values;
+using ::testing::proto::Approximately;
+using ::testing::proto::Partially;
+
+constexpr char kTestDataDirectory[] = "/mediapipe/tasks/testdata/vision/";
+constexpr char kHandLandmarkerBundleAsset[] = "hand_landmarker.task";
+constexpr char kThumbUpLandmarksFilename[] = "thumb_up_landmarks.pbtxt";
+constexpr char kPointingUpLandmarksFilename[] = "pointing_up_landmarks.pbtxt";
+constexpr char kPointingUpRotatedLandmarksFilename[] =
+    "pointing_up_rotated_landmarks.pbtxt";
+constexpr char kThumbUpImage[] = "thumb_up.jpg";
+constexpr char kPointingUpImage[] = "pointing_up.jpg";
+constexpr char kPointingUpRotatedImage[] = "pointing_up_rotated.jpg";
+constexpr char kNoHandsImage[] = "cats_and_dogs.jpg";
+
+constexpr float kLandmarksFractionDiff = 0.03;  // percentage
+constexpr float kLandmarksAbsMargin = 0.03;
+constexpr float kHandednessMargin = 0.05;
+
+LandmarksDetectionResult GetLandmarksDetectionResult(
+    absl::string_view landmarks_file_name) {
+  LandmarksDetectionResult result;
+  MP_EXPECT_OK(GetTextProto(
+      file::JoinPath("./", kTestDataDirectory, landmarks_file_name), &result,
+      Defaults()));
+  // Remove z position of landmarks, because they are not used in correctness
+  // testing. For video or live stream mode, the z positions varies a lot during
+  // tracking from frame to frame.
+  for (int i = 0; i < result.landmarks().landmark().size(); i++) {
+    auto& landmark = *result.mutable_landmarks()->mutable_landmark(i);
+    landmark.clear_z();
+  }
+  return result;
+}
+
+HandLandmarksDetectionResult GetExpectedHandLandmarksDetectionResult(
+    const std::vector<absl::string_view>& landmarks_file_names) {
+  HandLandmarksDetectionResult expected_results;
+  for (const auto& file_name : landmarks_file_names) {
+    const auto landmarks_detection_result =
+        GetLandmarksDetectionResult(file_name);
+    expected_results.hand_landmarks.push_back(
+        landmarks_detection_result.landmarks());
+    expected_results.handedness.push_back(
+        landmarks_detection_result.classifications());
+  }
+  return expected_results;
+}
+
+void ExpectHandLandmarksDetectionResultsCorrect(
+    const HandLandmarksDetectionResult& actual_results,
+    const HandLandmarksDetectionResult& expected_results) {
+  const auto& actual_landmarks = actual_results.hand_landmarks;
+  const auto& actual_handedness = actual_results.handedness;
+
+  const auto& expected_landmarks = expected_results.hand_landmarks;
+  const auto& expected_handedness = expected_results.handedness;
+
+  ASSERT_EQ(actual_landmarks.size(), expected_landmarks.size());
+  ASSERT_EQ(actual_handedness.size(), expected_handedness.size());
+
+  EXPECT_THAT(
+      actual_handedness,
+      Pointwise(Approximately(Partially(EqualsProto()), kHandednessMargin),
+                expected_handedness));
+  EXPECT_THAT(actual_landmarks,
+              Pointwise(Approximately(Partially(EqualsProto()),
+                                      /*margin=*/kLandmarksAbsMargin,
+                                      /*fraction=*/kLandmarksFractionDiff),
+                        expected_landmarks));
+}
+
+}  // namespace
+
+struct TestParams {
+  // The name of this test, for convenience when displaying test results.
+  std::string test_name;
+  // The filename of test image.
+  std::string test_image_name;
+  // The filename of test model.
+  std::string test_model_file;
+  // The rotation to apply to the test image before processing, in degrees
+  // clockwise.
+  int rotation;
+  // Expected results from the hand landmarker model output.
+  HandLandmarksDetectionResult expected_results;
+};
+
+class ImageModeTest : public testing::TestWithParam<TestParams> {};
+
+TEST_F(ImageModeTest, FailsWithCallingWrongMethod) {
+  MP_ASSERT_OK_AND_ASSIGN(
+      Image image,
+      DecodeImageFromFile(JoinPath("./", kTestDataDirectory, kThumbUpImage)));
+  auto options = std::make_unique<HandLandmarkerOptions>();
+  options->base_options.model_asset_path =
+      JoinPath("./", kTestDataDirectory, kHandLandmarkerBundleAsset);
+  options->running_mode = core::RunningMode::IMAGE;
+
+  MP_ASSERT_OK_AND_ASSIGN(std::unique_ptr<HandLandmarker> hand_landmarker,
+                          HandLandmarker::Create(std::move(options)));
+  auto results = hand_landmarker->DetectForVideo(image, 0);
+  EXPECT_EQ(results.status().code(), absl::StatusCode::kInvalidArgument);
+  EXPECT_THAT(results.status().message(),
+              HasSubstr("not initialized with the video mode"));
+  EXPECT_THAT(results.status().GetPayload(kMediaPipeTasksPayload),
+              Optional(absl::Cord(absl::StrCat(
+                  MediaPipeTasksStatus::kRunnerApiCalledInWrongModeError))));
+
+  results = hand_landmarker->DetectAsync(image, 0);
+  EXPECT_EQ(results.status().code(), absl::StatusCode::kInvalidArgument);
+  EXPECT_THAT(results.status().message(),
+              HasSubstr("not initialized with the live stream mode"));
+  EXPECT_THAT(results.status().GetPayload(kMediaPipeTasksPayload),
+              Optional(absl::Cord(absl::StrCat(
+                  MediaPipeTasksStatus::kRunnerApiCalledInWrongModeError))));
+  MP_ASSERT_OK(hand_landmarker->Close());
+}
+
+TEST_F(ImageModeTest, FailsWithRegionOfInterest) {
+  MP_ASSERT_OK_AND_ASSIGN(
+      Image image,
+      DecodeImageFromFile(JoinPath("./", kTestDataDirectory, kThumbUpImage)));
+  auto options = std::make_unique<HandLandmarkerOptions>();
+  options->base_options.model_asset_path =
+      JoinPath("./", kTestDataDirectory, kHandLandmarkerBundleAsset);
+  options->running_mode = core::RunningMode::IMAGE;
+  MP_ASSERT_OK_AND_ASSIGN(std::unique_ptr<HandLandmarker> hand_landmarker,
+                          HandLandmarker::Create(std::move(options)));
+  Rect roi{/*left=*/0.1, /*top=*/0, /*right=*/0.9, /*bottom=*/1};
+  ImageProcessingOptions image_processing_options{roi, /*rotation_degrees=*/0};
+
+  auto results = hand_landmarker->Detect(image, image_processing_options);
+  EXPECT_EQ(results.status().code(), absl::StatusCode::kInvalidArgument);
+  EXPECT_THAT(results.status().message(),
+              HasSubstr("This task doesn't support region-of-interest"));
+  EXPECT_THAT(
+      results.status().GetPayload(kMediaPipeTasksPayload),
+      Optional(absl::Cord(absl::StrCat(
+          MediaPipeTasksStatus::kImageProcessingInvalidArgumentError))));
+}
+
+TEST_P(ImageModeTest, Succeeds) {
+  MP_ASSERT_OK_AND_ASSIGN(
+      Image image, DecodeImageFromFile(JoinPath("./", kTestDataDirectory,
+                                                GetParam().test_image_name)));
+  auto options = std::make_unique<HandLandmarkerOptions>();
+  options->base_options.model_asset_path =
+      JoinPath("./", kTestDataDirectory, GetParam().test_model_file);
+  options->running_mode = core::RunningMode::IMAGE;
+
+  MP_ASSERT_OK_AND_ASSIGN(std::unique_ptr<HandLandmarker> hand_landmarker,
+                          HandLandmarker::Create(std::move(options)));
+  HandLandmarksDetectionResult hand_landmarker_results;
+  if (GetParam().rotation != 0) {
+    ImageProcessingOptions image_processing_options;
+    image_processing_options.rotation_degrees = GetParam().rotation;
+    MP_ASSERT_OK_AND_ASSIGN(
+        hand_landmarker_results,
+        hand_landmarker->Detect(image, image_processing_options));
+  } else {
+    MP_ASSERT_OK_AND_ASSIGN(hand_landmarker_results,
+                            hand_landmarker->Detect(image));
+  }
+  ExpectHandLandmarksDetectionResultsCorrect(hand_landmarker_results,
+                                             GetParam().expected_results);
+  MP_ASSERT_OK(hand_landmarker->Close());
+}
+
+INSTANTIATE_TEST_SUITE_P(
+    HandGestureTest, ImageModeTest,
+    Values(TestParams{
+               /* test_name= */ "LandmarksThumbUp",
+               /* test_image_name= */ kThumbUpImage,
+               /* test_model_file= */ kHandLandmarkerBundleAsset,
+               /* rotation= */ 0,
+               /* expected_results = */
+               GetExpectedHandLandmarksDetectionResult(
+                   {kThumbUpLandmarksFilename}),
+           },
+           TestParams{
+               /* test_name= */ "LandmarksPointingUp",
+               /* test_image_name= */ kPointingUpImage,
+               /* test_model_file= */ kHandLandmarkerBundleAsset,
+               /* rotation= */ 0,
+               /* expected_results = */
+               GetExpectedHandLandmarksDetectionResult(
+                   {kPointingUpLandmarksFilename}),
+           },
+           TestParams{
+               /* test_name= */ "LandmarksPointingUpRotated",
+               /* test_image_name= */ kPointingUpRotatedImage,
+               /* test_model_file= */ kHandLandmarkerBundleAsset,
+               /* rotation= */ -90,
+               /* expected_results = */
+               GetExpectedHandLandmarksDetectionResult(
+                   {kPointingUpRotatedLandmarksFilename}),
+           },
+           TestParams{
+               /* test_name= */ "NoHands",
+               /* test_image_name= */ kNoHandsImage,
+               /* test_model_file= */ kHandLandmarkerBundleAsset,
+               /* rotation= */ 0,
+               /* expected_results = */
+               {{}, {}, {}},
+           }),
+    [](const TestParamInfo<ImageModeTest::ParamType>& info) {
+      return info.param.test_name;
+    });
+
+class VideoModeTest : public testing::TestWithParam<TestParams> {};
+
+TEST_F(VideoModeTest, FailsWithCallingWrongMethod) {
+  MP_ASSERT_OK_AND_ASSIGN(
+      Image image,
+      DecodeImageFromFile(JoinPath("./", kTestDataDirectory, kThumbUpImage)));
+  auto options = std::make_unique<HandLandmarkerOptions>();
+  options->base_options.model_asset_path =
+      JoinPath("./", kTestDataDirectory, kHandLandmarkerBundleAsset);
+  options->running_mode = core::RunningMode::VIDEO;
+
+  MP_ASSERT_OK_AND_ASSIGN(std::unique_ptr<HandLandmarker> hand_landmarker,
+                          HandLandmarker::Create(std::move(options)));
+  auto results = hand_landmarker->Detect(image);
+  EXPECT_EQ(results.status().code(), absl::StatusCode::kInvalidArgument);
+  EXPECT_THAT(results.status().message(),
+              HasSubstr("not initialized with the image mode"));
+  EXPECT_THAT(results.status().GetPayload(kMediaPipeTasksPayload),
+              Optional(absl::Cord(absl::StrCat(
+                  MediaPipeTasksStatus::kRunnerApiCalledInWrongModeError))));
+
+  results = hand_landmarker->DetectAsync(image, 0);
+  EXPECT_EQ(results.status().code(), absl::StatusCode::kInvalidArgument);
+  EXPECT_THAT(results.status().message(),
+              HasSubstr("not initialized with the live stream mode"));
+  EXPECT_THAT(results.status().GetPayload(kMediaPipeTasksPayload),
+              Optional(absl::Cord(absl::StrCat(
+                  MediaPipeTasksStatus::kRunnerApiCalledInWrongModeError))));
+  MP_ASSERT_OK(hand_landmarker->Close());
+}
+
+TEST_P(VideoModeTest, Succeeds) {
+  const int iterations = 100;
+  MP_ASSERT_OK_AND_ASSIGN(
+      Image image, DecodeImageFromFile(JoinPath("./", kTestDataDirectory,
+                                                GetParam().test_image_name)));
+  auto options = std::make_unique<HandLandmarkerOptions>();
+  options->base_options.model_asset_path =
+      JoinPath("./", kTestDataDirectory, GetParam().test_model_file);
+  options->running_mode = core::RunningMode::VIDEO;
+
+  MP_ASSERT_OK_AND_ASSIGN(std::unique_ptr<HandLandmarker> hand_landmarker,
+                          HandLandmarker::Create(std::move(options)));
+  const auto expected_results = GetParam().expected_results;
+  for (int i = 0; i < iterations; ++i) {
+    HandLandmarksDetectionResult hand_landmarker_results;
+    if (GetParam().rotation != 0) {
+      ImageProcessingOptions image_processing_options;
+      image_processing_options.rotation_degrees = GetParam().rotation;
+      MP_ASSERT_OK_AND_ASSIGN(
+          hand_landmarker_results,
+          hand_landmarker->DetectForVideo(image, i, image_processing_options));
+    } else {
+      MP_ASSERT_OK_AND_ASSIGN(hand_landmarker_results,
+                              hand_landmarker->DetectForVideo(image, i));
+    }
+    ExpectHandLandmarksDetectionResultsCorrect(hand_landmarker_results,
+                                               expected_results);
+  }
+  MP_ASSERT_OK(hand_landmarker->Close());
+}
+
+INSTANTIATE_TEST_SUITE_P(
+    HandGestureTest, VideoModeTest,
+    Values(TestParams{
+               /* test_name= */ "LandmarksThumbUp",
+               /* test_image_name= */ kThumbUpImage,
+               /* test_model_file= */ kHandLandmarkerBundleAsset,
+               /* rotation= */ 0,
+               /* expected_results = */
+               GetExpectedHandLandmarksDetectionResult(
+                   {kThumbUpLandmarksFilename}),
+           },
+           TestParams{
+               /* test_name= */ "LandmarksPointingUp",
+               /* test_image_name= */ kPointingUpImage,
+               /* test_model_file= */ kHandLandmarkerBundleAsset,
+               /* rotation= */ 0,
+               /* expected_results = */
+               GetExpectedHandLandmarksDetectionResult(
+                   {kPointingUpLandmarksFilename}),
+           },
+           TestParams{
+               /* test_name= */ "LandmarksPointingUpRotated",
+               /* test_image_name= */ kPointingUpRotatedImage,
+               /* test_model_file= */ kHandLandmarkerBundleAsset,
+               /* rotation= */ -90,
+               /* expected_results = */
+               GetExpectedHandLandmarksDetectionResult(
+                   {kPointingUpRotatedLandmarksFilename}),
+           },
+           TestParams{
+               /* test_name= */ "NoHands",
+               /* test_image_name= */ kNoHandsImage,
+               /* test_model_file= */ kHandLandmarkerBundleAsset,
+               /* rotation= */ 0,
+               /* expected_results = */
+               {{}, {}, {}},
+           }),
+    [](const TestParamInfo<ImageModeTest::ParamType>& info) {
+      return info.param.test_name;
+    });
+
+class LiveStreamModeTest : public testing::TestWithParam<TestParams> {};
+
+TEST_F(LiveStreamModeTest, FailsWithCallingWrongMethod) {
+  MP_ASSERT_OK_AND_ASSIGN(
+      Image image,
+      DecodeImageFromFile(JoinPath("./", kTestDataDirectory, kThumbUpImage)));
+  auto options = std::make_unique<HandLandmarkerOptions>();
+  options->base_options.model_asset_path =
+      JoinPath("./", kTestDataDirectory, kHandLandmarkerBundleAsset);
+  options->running_mode = core::RunningMode::LIVE_STREAM;
+  options->result_callback =
+      [](absl::StatusOr<HandLandmarksDetectionResult> results,
+         const Image& image, int64 timestamp_ms) {};
+
+  MP_ASSERT_OK_AND_ASSIGN(std::unique_ptr<HandLandmarker> hand_landmarker,
+                          HandLandmarker::Create(std::move(options)));
+  auto results = hand_landmarker->Detect(image);
+  EXPECT_EQ(results.status().code(), absl::StatusCode::kInvalidArgument);
+  EXPECT_THAT(results.status().message(),
+              HasSubstr("not initialized with the image mode"));
+  EXPECT_THAT(results.status().GetPayload(kMediaPipeTasksPayload),
+              Optional(absl::Cord(absl::StrCat(
+                  MediaPipeTasksStatus::kRunnerApiCalledInWrongModeError))));
+
+  results = hand_landmarker->DetectForVideo(image, 0);
+  EXPECT_EQ(results.status().code(), absl::StatusCode::kInvalidArgument);
+  EXPECT_THAT(results.status().message(),
+              HasSubstr("not initialized with the video mode"));
+  EXPECT_THAT(results.status().GetPayload(kMediaPipeTasksPayload),
+              Optional(absl::Cord(absl::StrCat(
+                  MediaPipeTasksStatus::kRunnerApiCalledInWrongModeError))));
+  MP_ASSERT_OK(hand_landmarker->Close());
+}
+
+TEST_P(LiveStreamModeTest, Succeeds) {
+  const int iterations = 100;
+  MP_ASSERT_OK_AND_ASSIGN(
+      Image image, DecodeImageFromFile(JoinPath("./", kTestDataDirectory,
+                                                GetParam().test_image_name)));
+  auto options = std::make_unique<HandLandmarkerOptions>();
+  options->base_options.model_asset_path =
+      JoinPath("./", kTestDataDirectory, GetParam().test_model_file);
+  options->running_mode = core::RunningMode::LIVE_STREAM;
+  std::vector<HandLandmarksDetectionResult> hand_landmarker_results;
+  std::vector<std::pair<int, int>> image_sizes;
+  std::vector<int64> timestamps;
+  options->result_callback =
+      [&hand_landmarker_results, &image_sizes, &timestamps](
+          absl::StatusOr<HandLandmarksDetectionResult> results,
+          const Image& image, int64 timestamp_ms) {
+        MP_ASSERT_OK(results.status());
+        hand_landmarker_results.push_back(std::move(results.value()));
+        image_sizes.push_back({image.width(), image.height()});
+        timestamps.push_back(timestamp_ms);
+      };
+
+  MP_ASSERT_OK_AND_ASSIGN(std::unique_ptr<HandLandmarker> hand_landmarker,
+                          HandLandmarker::Create(std::move(options)));
+  for (int i = 0; i < iterations; ++i) {
+    HandLandmarksDetectionResult hand_landmarker_results;
+    if (GetParam().rotation != 0) {
+      ImageProcessingOptions image_processing_options;
+      image_processing_options.rotation_degrees = GetParam().rotation;
+      MP_ASSERT_OK(
+          hand_landmarker->DetectAsync(image, i, image_processing_options));
+    } else {
+      MP_ASSERT_OK(hand_landmarker->DetectAsync(image, i));
+    }
+  }
+  MP_ASSERT_OK(hand_landmarker->Close());
+  // Due to the flow limiter, the total of outputs will be smaller than the
+  // number of iterations.
+  ASSERT_LE(hand_landmarker_results.size(), iterations);
+  ASSERT_GT(hand_landmarker_results.size(), 0);
+
+  const auto expected_results = GetParam().expected_results;
+  for (int i = 0; i < hand_landmarker_results.size(); ++i) {
+    ExpectHandLandmarksDetectionResultsCorrect(hand_landmarker_results[i],
+                                               expected_results);
+  }
+  for (const auto& image_size : image_sizes) {
+    EXPECT_EQ(image_size.first, image.width());
+    EXPECT_EQ(image_size.second, image.height());
+  }
+  int64 timestamp_ms = -1;
+  for (const auto& timestamp : timestamps) {
+    EXPECT_GT(timestamp, timestamp_ms);
+    timestamp_ms = timestamp;
+  }
+}
+
+INSTANTIATE_TEST_SUITE_P(
+    HandGestureTest, LiveStreamModeTest,
+    Values(TestParams{
+               /* test_name= */ "LandmarksThumbUp",
+               /* test_image_name= */ kThumbUpImage,
+               /* test_model_file= */ kHandLandmarkerBundleAsset,
+               /* rotation= */ 0,
+               /* expected_results = */
+               GetExpectedHandLandmarksDetectionResult(
+                   {kThumbUpLandmarksFilename}),
+           },
+           TestParams{
+               /* test_name= */ "LandmarksPointingUp",
+               /* test_image_name= */ kPointingUpImage,
+               /* test_model_file= */ kHandLandmarkerBundleAsset,
+               /* rotation= */ 0,
+               /* expected_results = */
+               GetExpectedHandLandmarksDetectionResult(
+                   {kPointingUpLandmarksFilename}),
+           },
+           TestParams{
+               /* test_name= */ "LandmarksPointingUpRotated",
+               /* test_image_name= */ kPointingUpRotatedImage,
+               /* test_model_file= */ kHandLandmarkerBundleAsset,
+               /* rotation= */ -90,
+               /* expected_results = */
+               GetExpectedHandLandmarksDetectionResult(
+                   {kPointingUpRotatedLandmarksFilename}),
+           },
+           TestParams{
+               /* test_name= */ "NoHands",
+               /* test_image_name= */ kNoHandsImage,
+               /* test_model_file= */ kHandLandmarkerBundleAsset,
+               /* rotation= */ 0,
+               /* expected_results = */
+               {{}, {}, {}},
+           }),
+    [](const TestParamInfo<ImageModeTest::ParamType>& info) {
+      return info.param.test_name;
+    });
+
+}  // namespace hand_landmarker
+}  // namespace vision
+}  // namespace tasks
+}  // namespace mediapipe

mediapipe/tasks/cc/vision/image_segmenter/BUILD

@@ -32,7 +32,7 @@ cc_library(
         "//mediapipe/tasks/cc/vision/core:image_processing_options",
         "//mediapipe/tasks/cc/vision/core:running_mode",
         "//mediapipe/tasks/cc/vision/core:vision_task_api_factory",
-        "//mediapipe/tasks/cc/vision/image_segmenter/proto:image_segmenter_options_cc_proto",
+        "//mediapipe/tasks/cc/vision/image_segmenter/proto:image_segmenter_graph_options_cc_proto",
         "@com_google_absl//absl/memory",
         "@com_google_absl//absl/status:statusor",
         "@org_tensorflow//tensorflow/lite/kernels:builtin_ops",
@@ -63,7 +63,7 @@ cc_library(
         "//mediapipe/tasks/cc/core/proto:acceleration_cc_proto",
         "//mediapipe/tasks/cc/core/proto:inference_subgraph_cc_proto",
         "//mediapipe/tasks/cc/metadata:metadata_extractor",
-        "//mediapipe/tasks/cc/vision/image_segmenter/proto:image_segmenter_options_cc_proto",
+        "//mediapipe/tasks/cc/vision/image_segmenter/proto:image_segmenter_graph_options_cc_proto",
         "//mediapipe/tasks/metadata:metadata_schema_cc",
         "//mediapipe/util:label_map_cc_proto",
         "//mediapipe/util:label_map_util",

mediapipe/tasks/cc/vision/image_segmenter/image_segmenter.cc

@@ -23,10 +23,12 @@ limitations under the License.
 #include "mediapipe/tasks/cc/vision/core/image_processing_options.h"
 #include "mediapipe/tasks/cc/vision/core/running_mode.h"
 #include "mediapipe/tasks/cc/vision/core/vision_task_api_factory.h"
+#include "mediapipe/tasks/cc/vision/image_segmenter/proto/image_segmenter_graph_options.pb.h"
 
 namespace mediapipe {
 namespace tasks {
 namespace vision {
+namespace image_segmenter {
 namespace {
 
 constexpr char kSegmentationStreamName[] = "segmented_mask_out";
@@ -37,23 +39,24 @@ constexpr char kImageTag[] = "IMAGE";
 constexpr char kNormRectStreamName[] = "norm_rect_in";
 constexpr char kNormRectTag[] = "NORM_RECT";
 constexpr char kSubgraphTypeName[] =
-    "mediapipe.tasks.vision.ImageSegmenterGraph";
+    "mediapipe.tasks.vision.image_segmenter.ImageSegmenterGraph";
 constexpr int kMicroSecondsPerMilliSecond = 1000;
 
 using ::mediapipe::CalculatorGraphConfig;
 using ::mediapipe::Image;
 using ::mediapipe::tasks::components::proto::SegmenterOptions;
-using ImageSegmenterOptionsProto =
+using ImageSegmenterGraphOptionsProto = ::mediapipe::tasks::vision::
-    image_segmenter::proto::ImageSegmenterOptions;
+    image_segmenter::proto::ImageSegmenterGraphOptions;
 
 // Creates a MediaPipe graph config that only contains a single subgraph node of
-// "mediapipe.tasks.vision.ImageSegmenterGraph".
+// "mediapipe.tasks.vision.image_segmenter.ImageSegmenterGraph".
 CalculatorGraphConfig CreateGraphConfig(
-    std::unique_ptr<ImageSegmenterOptionsProto> options,
+    std::unique_ptr<ImageSegmenterGraphOptionsProto> options,
     bool enable_flow_limiting) {
   api2::builder::Graph graph;
   auto& task_subgraph = graph.AddNode(kSubgraphTypeName);
-  task_subgraph.GetOptions<ImageSegmenterOptionsProto>().Swap(options.get());
+  task_subgraph.GetOptions<ImageSegmenterGraphOptionsProto>().Swap(
+      options.get());
   graph.In(kImageTag).SetName(kImageInStreamName);
   graph.In(kNormRectTag).SetName(kNormRectStreamName);
   task_subgraph.Out(kGroupedSegmentationTag).SetName(kSegmentationStreamName) >>
@@ -72,9 +75,9 @@ CalculatorGraphConfig CreateGraphConfig(
 
 // Converts the user-facing ImageSegmenterOptions struct to the internal
 // ImageSegmenterOptions proto.
-std::unique_ptr<ImageSegmenterOptionsProto> ConvertImageSegmenterOptionsToProto(
+std::unique_ptr<ImageSegmenterGraphOptionsProto>
-    ImageSegmenterOptions* options) {
+ConvertImageSegmenterOptionsToProto(ImageSegmenterOptions* options) {
-  auto options_proto = std::make_unique<ImageSegmenterOptionsProto>();
+  auto options_proto = std::make_unique<ImageSegmenterGraphOptionsProto>();
   auto base_options_proto = std::make_unique<tasks::core::proto::BaseOptions>(
       tasks::core::ConvertBaseOptionsToProto(&(options->base_options)));
   options_proto->mutable_base_options()->Swap(base_options_proto.get());
@@ -137,7 +140,7 @@ absl::StatusOr<std::unique_ptr<ImageSegmenter>> ImageSegmenter::Create(
         };
   }
   return core::VisionTaskApiFactory::Create<ImageSegmenter,
-                                            ImageSegmenterOptionsProto>(
+                                            ImageSegmenterGraphOptionsProto>(
       CreateGraphConfig(
           std::move(options_proto),
           options->running_mode == core::RunningMode::LIVE_STREAM),
@@ -211,6 +214,7 @@ absl::Status ImageSegmenter::SegmentAsync(
             .At(Timestamp(timestamp_ms * kMicroSecondsPerMilliSecond))}});
 }
 
+}  // namespace image_segmenter
 }  // namespace vision
 }  // namespace tasks
 }  // namespace mediapipe

mediapipe/tasks/cc/vision/image_segmenter/image_segmenter.h

@@ -26,12 +26,12 @@ limitations under the License.
 #include "mediapipe/tasks/cc/core/base_options.h"
 #include "mediapipe/tasks/cc/vision/core/base_vision_task_api.h"
 #include "mediapipe/tasks/cc/vision/core/image_processing_options.h"
-#include "mediapipe/tasks/cc/vision/image_segmenter/proto/image_segmenter_options.pb.h"
 #include "tensorflow/lite/kernels/register.h"
 
 namespace mediapipe {
 namespace tasks {
 namespace vision {
+namespace image_segmenter {
 
 // The options for configuring a mediapipe image segmenter task.
 struct ImageSegmenterOptions {
@@ -191,6 +191,7 @@ class ImageSegmenter : tasks::vision::core::BaseVisionTaskApi {
   absl::Status Close() { return runner_->Close(); }
 };
 
+}  // namespace image_segmenter
 }  // namespace vision
 }  // namespace tasks
 }  // namespace mediapipe

mediapipe/tasks/cc/vision/image_segmenter/image_segmenter_graph.cc

@@ -35,7 +35,7 @@ limitations under the License.
 #include "mediapipe/tasks/cc/core/proto/acceleration.pb.h"
 #include "mediapipe/tasks/cc/core/proto/inference_subgraph.pb.h"
 #include "mediapipe/tasks/cc/metadata/metadata_extractor.h"
-#include "mediapipe/tasks/cc/vision/image_segmenter/proto/image_segmenter_options.pb.h"
+#include "mediapipe/tasks/cc/vision/image_segmenter/proto/image_segmenter_graph_options.pb.h"
 #include "mediapipe/tasks/metadata/metadata_schema_generated.h"
 #include "mediapipe/util/label_map.pb.h"
 #include "mediapipe/util/label_map_util.h"
@@ -44,6 +44,7 @@ limitations under the License.
 namespace mediapipe {
 namespace tasks {
 namespace vision {
+namespace image_segmenter {
 
 namespace {
 
@@ -55,7 +56,8 @@ using ::mediapipe::api2::builder::MultiSource;
 using ::mediapipe::api2::builder::Source;
 using ::mediapipe::tasks::components::proto::SegmenterOptions;
 using ::mediapipe::tasks::metadata::ModelMetadataExtractor;
-using ::mediapipe::tasks::vision::image_segmenter::proto::ImageSegmenterOptions;
+using ::mediapipe::tasks::vision::image_segmenter::proto::
+    ImageSegmenterGraphOptions;
 using ::tflite::Tensor;
 using ::tflite::TensorMetadata;
 using LabelItems = mediapipe::proto_ns::Map<int64, ::mediapipe::LabelMapItem>;
@@ -77,7 +79,7 @@ struct ImageSegmenterOutputs {
 
 }  // namespace
 
-absl::Status SanityCheckOptions(const ImageSegmenterOptions& options) {
+absl::Status SanityCheckOptions(const ImageSegmenterGraphOptions& options) {
   if (options.segmenter_options().output_type() ==
       SegmenterOptions::UNSPECIFIED) {
     return CreateStatusWithPayload(absl::StatusCode::kInvalidArgument,
@@ -112,7 +114,7 @@ absl::StatusOr<LabelItems> GetLabelItemsIfAny(
 }
 
 absl::Status ConfigureTensorsToSegmentationCalculator(
-    const ImageSegmenterOptions& segmenter_option,
+    const ImageSegmenterGraphOptions& segmenter_option,
     const core::ModelResources& model_resources,
     TensorsToSegmentationCalculatorOptions* options) {
   *options->mutable_segmenter_options() = segmenter_option.segmenter_options();
@@ -181,7 +183,7 @@ absl::StatusOr<const Tensor*> GetOutputTensor(
 //   input_stream: "IMAGE:image"
 //   output_stream: "SEGMENTATION:segmented_masks"
 //   options {
-//     [mediapipe.tasks.vision.image_segmenter.proto.ImageSegmenterOptions.ext]
+//     [mediapipe.tasks.vision.image_segmenter.proto.ImageSegmenterGraphOptions.ext]
 //     {
 //       base_options {
 //         model_asset {
@@ -200,12 +202,12 @@ class ImageSegmenterGraph : public core::ModelTaskGraph {
   absl::StatusOr<mediapipe::CalculatorGraphConfig> GetConfig(
       mediapipe::SubgraphContext* sc) override {
     ASSIGN_OR_RETURN(const auto* model_resources,
-                     CreateModelResources<ImageSegmenterOptions>(sc));
+                     CreateModelResources<ImageSegmenterGraphOptions>(sc));
     Graph graph;
     ASSIGN_OR_RETURN(
         auto output_streams,
         BuildSegmentationTask(
-            sc->Options<ImageSegmenterOptions>(), *model_resources,
+            sc->Options<ImageSegmenterGraphOptions>(), *model_resources,
             graph[Input<Image>(kImageTag)],
             graph[Input<NormalizedRect>::Optional(kNormRectTag)], graph));
 
@@ -228,13 +230,13 @@ class ImageSegmenterGraph : public core::ModelTaskGraph {
   // builder::Graph instance. The segmentation pipeline takes images
   // (mediapipe::Image) as the input and returns segmented image mask as output.
   //
-  // task_options: the mediapipe tasks ImageSegmenterOptions proto.
+  // task_options: the mediapipe tasks ImageSegmenterGraphOptions proto.
   // model_resources: the ModelSources object initialized from a segmentation
   // model file with model metadata.
   // image_in: (mediapipe::Image) stream to run segmentation on.
   // graph: the mediapipe builder::Graph instance to be updated.
   absl::StatusOr<ImageSegmenterOutputs> BuildSegmentationTask(
-      const ImageSegmenterOptions& task_options,
+      const ImageSegmenterGraphOptions& task_options,
       const core::ModelResources& model_resources, Source<Image> image_in,
       Source<NormalizedRect> norm_rect_in, Graph& graph) {
     MP_RETURN_IF_ERROR(SanityCheckOptions(task_options));
@@ -293,8 +295,10 @@ class ImageSegmenterGraph : public core::ModelTaskGraph {
   }
 };
 
-REGISTER_MEDIAPIPE_GRAPH(::mediapipe::tasks::vision::ImageSegmenterGraph);
+REGISTER_MEDIAPIPE_GRAPH(
+    ::mediapipe::tasks::vision::image_segmenter::ImageSegmenterGraph);
 
+}  // namespace image_segmenter
 }  // namespace vision
 }  // namespace tasks
 }  // namespace mediapipe

mediapipe/tasks/cc/vision/image_segmenter/image_segmenter_test.cc

@@ -33,7 +33,7 @@ limitations under the License.
 #include "mediapipe/tasks/cc/core/proto/base_options.pb.h"
 #include "mediapipe/tasks/cc/core/proto/external_file.pb.h"
 #include "mediapipe/tasks/cc/vision/core/image_processing_options.h"
-#include "mediapipe/tasks/cc/vision/image_segmenter/proto/image_segmenter_options.pb.h"
+#include "mediapipe/tasks/cc/vision/image_segmenter/proto/image_segmenter_graph_options.pb.h"
 #include "mediapipe/tasks/cc/vision/utils/image_utils.h"
 #include "tensorflow/lite/core/shims/cc/shims_test_util.h"
 #include "tensorflow/lite/kernels/builtin_op_kernels.h"
@@ -42,6 +42,7 @@ limitations under the License.
 namespace mediapipe {
 namespace tasks {
 namespace vision {
+namespace image_segmenter {
 namespace {
 
 using ::mediapipe::Image;
@@ -547,6 +548,7 @@ TEST_F(LiveStreamModeTest, Succeeds) {
 // TODO: Add test for hair segmentation model.
 
 }  // namespace
+}  // namespace image_segmenter
 }  // namespace vision
 }  // namespace tasks
 }  // namespace mediapipe

mediapipe/tasks/cc/vision/image_segmenter/proto/BUILD

@@ -19,8 +19,8 @@ package(default_visibility = ["//mediapipe/tasks:internal"])
 licenses(["notice"])
 
 mediapipe_proto_library(
-    name = "image_segmenter_options_proto",
+    name = "image_segmenter_graph_options_proto",
-    srcs = ["image_segmenter_options.proto"],
+    srcs = ["image_segmenter_graph_options.proto"],
     deps = [
         "//mediapipe/framework:calculator_options_proto",
         "//mediapipe/framework:calculator_proto",

mediapipe/tasks/cc/vision/image_segmenter/proto/image_segmenter_graph_options.proto

@@ -21,9 +21,12 @@ import "mediapipe/framework/calculator.proto";
 import "mediapipe/tasks/cc/components/proto/segmenter_options.proto";
 import "mediapipe/tasks/cc/core/proto/base_options.proto";
 
-message ImageSegmenterOptions {
+option java_package = "com.google.mediapipe.tasks.vision.imagesegmenter.proto";
+option java_outer_classname = "ImageSegmenterGraphOptionsProto";
+
+message ImageSegmenterGraphOptions {
   extend mediapipe.CalculatorOptions {
-    optional ImageSegmenterOptions ext = 458105758;
+    optional ImageSegmenterGraphOptions ext = 458105758;
   }
   // Base options for configuring MediaPipe Tasks, such as specifying the TfLite
   // model file with metadata, accelerator options, etc.

mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers/BUILD

@@ -20,6 +20,7 @@ android_library(
     name = "category",
     srcs = ["Category.java"],
     deps = [
+        "//mediapipe/framework/formats:classification_java_proto_lite",
         "//third_party:autovalue",
         "@maven//:com_google_guava_guava",
     ],
@@ -36,20 +37,29 @@ android_library(
 )
 
 android_library(
-    name = "classification_entry",
+    name = "classifications",
-    srcs = ["ClassificationEntry.java"],
+    srcs = ["Classifications.java"],
+    javacopts = [
+        "-Xep:AndroidJdkLibsChecker:OFF",
+    ],
     deps = [
         ":category",
+        "//mediapipe/framework/formats:classification_java_proto_lite",
+        "//mediapipe/tasks/cc/components/containers/proto:classifications_java_proto_lite",
         "//third_party:autovalue",
         "@maven//:com_google_guava_guava",
     ],
 )
 
 android_library(
-    name = "classifications",
+    name = "classificationresult",
-    srcs = ["Classifications.java"],
+    srcs = ["ClassificationResult.java"],
+    javacopts = [
+        "-Xep:AndroidJdkLibsChecker:OFF",
+    ],
     deps = [
-        ":classification_entry",
+        ":classifications",
+        "//mediapipe/tasks/cc/components/containers/proto:classifications_java_proto_lite",
         "//third_party:autovalue",
         "@maven//:com_google_guava_guava",
     ],

mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers/Category.java

@@ -15,6 +15,7 @@
 package com.google.mediapipe.tasks.components.containers;
 
 import com.google.auto.value.AutoValue;
+import com.google.mediapipe.formats.proto.ClassificationProto;
 import java.util.Objects;
 
 /**
@@ -38,6 +39,16 @@ public abstract class Category {
     return new AutoValue_Category(score, index, categoryName, displayName);
   }
 
+  /**
+   * Creates a {@link Category} object from a {@link ClassificationProto.Classification} protobuf
+   * message.
+   *
+   * @param proto the {@link ClassificationProto.Classification} protobuf message to convert.
+   */
+  public static Category createFromProto(ClassificationProto.Classification proto) {
+    return create(proto.getScore(), proto.getIndex(), proto.getLabel(), proto.getDisplayName());
+  }
+
   /** The probability score of this label category. */
   public abstract float score();
 

mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers/ClassificationEntry.java

@@ -1,48 +0,0 @@
-// Copyright 2022 The MediaPipe Authors. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.mediapipe.tasks.components.containers;
-
-import com.google.auto.value.AutoValue;
-import java.util.Collections;
-import java.util.List;
-
-/**
- * Represents a list of predicted categories with an optional timestamp. Typically used as result
- * for classification tasks.
- */
-@AutoValue
-public abstract class ClassificationEntry {
-  /**
-   * Creates a {@link ClassificationEntry} instance from a list of {@link Category} and optional
-   * timestamp.
-   *
-   * @param categories the list of {@link Category} objects that contain category name, display
-   *     name, score and label index.
-   * @param timestampMs the {@link long} representing the timestamp for which these categories were
-   *     obtained.
-   */
-  public static ClassificationEntry create(List<Category> categories, long timestampMs) {
-    return new AutoValue_ClassificationEntry(Collections.unmodifiableList(categories), timestampMs);
-  }
-
-  /** The list of predicted {@link Category} objects, sorted by descending score. */
-  public abstract List<Category> categories();
-
-  /**
-   * The timestamp (in milliseconds) associated to the classification entry. This is useful for time
-   * series use cases, e.g. audio classification.
-   */
-  public abstract long timestampMs();
-}

mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers/ClassificationResult.java

@@ -0,0 +1,76 @@
+// Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.mediapipe.tasks.components.containers;
+
+import com.google.auto.value.AutoValue;
+import com.google.mediapipe.tasks.components.containers.proto.ClassificationsProto;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Represents the classification results of a model. Typically used as a result for classification
+ * tasks.
+ */
+@AutoValue
+public abstract class ClassificationResult {
+
+  /**
+   * Creates a {@link ClassificationResult} instance.
+   *
+   * @param classifications the list of {@link Classifications} objects containing the predicted
+   *     categories for each head of the model.
+   * @param timestampMs the optional timestamp (in milliseconds) of the start of the chunk of data
+   *     corresponding to these results.
+   */
+  public static ClassificationResult create(
+      List<Classifications> classifications, Optional<Long> timestampMs) {
+    return new AutoValue_ClassificationResult(
+        Collections.unmodifiableList(classifications), timestampMs);
+  }
+
+  /**
+   * Creates a {@link ClassificationResult} object from a {@link
+   * ClassificationsProto.ClassificationResult} protobuf message.
+   *
+   * @param proto the {@link ClassificationsProto.ClassificationResult} protobuf message to convert.
+   */
+  public static ClassificationResult createFromProto(
+      ClassificationsProto.ClassificationResult proto) {
+    List<Classifications> classifications = new ArrayList<>();
+    for (ClassificationsProto.Classifications classificationsProto :
+        proto.getClassificationsList()) {
+      classifications.add(Classifications.createFromProto(classificationsProto));
+    }
+    Optional<Long> timestampMs =
+        proto.hasTimestampMs() ? Optional.of(proto.getTimestampMs()) : Optional.empty();
+    return create(classifications, timestampMs);
+  }
+
+  /** The classification results for each head of the model. */
+  public abstract List<Classifications> classifications();
+
+  /**
+   * The optional timestamp (in milliseconds) of the start of the chunk of data corresponding to
+   * these results.
+   *
+   * <p>This is only used for classification on time series (e.g. audio classification). In these
+   * use cases, the amount of data to process might exceed the maximum size that the model can
+   * process: to solve this, the input data is split into multiple chunks starting at different
+   * timestamps.
+   */
+  public abstract Optional<Long> timestampMs();
+}

mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers/Classifications.java

@@ -15,8 +15,12 @@
 package com.google.mediapipe.tasks.components.containers;
 
 import com.google.auto.value.AutoValue;
+import com.google.mediapipe.formats.proto.ClassificationProto;
+import com.google.mediapipe.tasks.components.containers.proto.ClassificationsProto;
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.Optional;
 
 /**
  * Represents the list of classification for a given classifier head. Typically used as a result for
@@ -28,25 +32,41 @@ public abstract class Classifications {
   /**
    * Creates a {@link Classifications} instance.
    *
-   * @param entries the list of {@link ClassificationEntry} objects containing the predicted
+   * @param categories the list of {@link Category} objects containing the predicted categories.
-   *     categories.
    * @param headIndex the index of the classifier head.
-   * @param headName the name of the classifier head.
+   * @param headName the optional name of the classifier head.
    */
   public static Classifications create(
-      List<ClassificationEntry> entries, int headIndex, String headName) {
+      List<Category> categories, int headIndex, Optional<String> headName) {
     return new AutoValue_Classifications(
-        Collections.unmodifiableList(entries), headIndex, headName);
+        Collections.unmodifiableList(categories), headIndex, headName);
   }
 
-  /** A list of {@link ClassificationEntry} objects. */
+  /**
-  public abstract List<ClassificationEntry> entries();
+   * Creates a {@link Classifications} object from a {@link ClassificationsProto.Classifications}
+   * protobuf message.
+   *
+   * @param proto the {@link ClassificationsProto.Classifications} protobuf message to convert.
+   */
+  public static Classifications createFromProto(ClassificationsProto.Classifications proto) {
+    List<Category> categories = new ArrayList<>();
+    for (ClassificationProto.Classification classificationProto :
+        proto.getClassificationList().getClassificationList()) {
+      categories.add(Category.createFromProto(classificationProto));
+    }
+    Optional<String> headName =
+        proto.hasHeadName() ? Optional.of(proto.getHeadName()) : Optional.empty();
+    return create(categories, proto.getHeadIndex(), headName);
+  }
+
+  /** A list of {@link Category} objects. */
+  public abstract List<Category> categories();
 
   /**
    * The index of the classifier head these entries refer to. This is useful for multi-head models.
    */
   public abstract int headIndex();
 
-  /** The name of the classifier head, which is the corresponding tensor metadata name. */
+  /** The optional name of the classifier head, which is the corresponding tensor metadata name. */
-  public abstract String headName();
+  public abstract Optional<String> headName();
 }

mediapipe/tasks/java/com/google/mediapipe/tasks/core/BaseOptions.java

@@ -26,22 +26,23 @@ public abstract class BaseOptions {
   @AutoValue.Builder
   public abstract static class Builder {
     /**
-     * Sets the model path to a tflite model with metadata in the assets.
+     * Sets the model path to a model asset file (a tflite model or a model asset bundle file) in
+     * the Android app assets folder.
      *
      * <p>Note: when model path is set, both model file descriptor and model buffer should be empty.
      */
     public abstract Builder setModelAssetPath(String value);
 
     /**
-     * Sets the native fd int of a tflite model with metadata.
+     * Sets the native fd int of a model asset file (a tflite model or a model asset bundle file).
      *
      * <p>Note: when model file descriptor is set, both model path and model buffer should be empty.
      */
     public abstract Builder setModelAssetFileDescriptor(Integer value);
 
     /**
-     * Sets either the direct {@link ByteBuffer} or the {@link MappedByteBuffer} of a tflite model
+     * Sets either the direct {@link ByteBuffer} or the {@link MappedByteBuffer} of a model asset
-     * with metadata.
+     * file (a tflite model or a model asset bundle file).
      *
      * <p>Note: when model buffer is set, both model file and model file descriptor should be empty.
      */

mediapipe/tasks/java/com/google/mediapipe/tasks/mediapipe_tasks_aar.bzl

@@ -22,6 +22,7 @@ _CORE_TASKS_JAVA_PROTO_LITE_TARGETS = [
     "//mediapipe/tasks/cc/components/containers/proto:classifications_java_proto_lite",
     "//mediapipe/tasks/cc/components/containers/proto:embeddings_java_proto_lite",
     "//mediapipe/tasks/cc/components/containers/proto:landmarks_detection_result_java_proto_lite",
+    "//mediapipe/tasks/cc/components/proto:segmenter_options_java_proto_lite",
     "//mediapipe/tasks/cc/components/processors/proto:classifier_options_java_proto_lite",
     "//mediapipe/tasks/cc/components/processors/proto:embedder_options_java_proto_lite",
     "//mediapipe/tasks/cc/core/proto:acceleration_java_proto_lite",
@@ -36,6 +37,7 @@ _VISION_TASKS_JAVA_PROTO_LITE_TARGETS = [
     "//mediapipe/tasks/cc/vision/gesture_recognizer/proto:gesture_embedder_graph_options_java_proto_lite",
     "//mediapipe/tasks/cc/vision/gesture_recognizer/proto:gesture_recognizer_graph_options_java_proto_lite",
     "//mediapipe/tasks/cc/vision/gesture_recognizer/proto:hand_gesture_recognizer_graph_options_java_proto_lite",
+    "//mediapipe/tasks/cc/vision/image_segmenter/proto:image_segmenter_graph_options_java_proto_lite",
     "//mediapipe/tasks/cc/vision/hand_detector/proto:hand_detector_graph_options_java_proto_lite",
     "//mediapipe/tasks/cc/vision/hand_landmarker/proto:hand_landmarker_graph_options_java_proto_lite",
     "//mediapipe/tasks/cc/vision/hand_landmarker/proto:hand_landmarks_detector_graph_options_java_proto_lite",
@@ -232,7 +234,7 @@ def _mediapipe_tasks_aar(name, srcs, manifest, java_proto_lite_targets, native_l
             "//mediapipe/framework/formats:rect_java_proto_lite",
             "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers:detection",
             "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers:category",
-            "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers:classification_entry",
+            "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers:classificationresult",
             "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers:classifications",
             "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers:landmark",
             "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/processors:classifieroptions",

mediapipe/tasks/java/com/google/mediapipe/tasks/text/BUILD

@@ -37,8 +37,8 @@ cc_library(
 android_library(
     name = "textclassifier",
     srcs = [
-        "textclassifier/TextClassificationResult.java",
         "textclassifier/TextClassifier.java",
+        "textclassifier/TextClassifierResult.java",
     ],
     javacopts = [
         "-Xep:AndroidJdkLibsChecker:OFF",
@@ -51,9 +51,7 @@ android_library(
         "//mediapipe/tasks/cc/components/containers/proto:classifications_java_proto_lite",
         "//mediapipe/tasks/cc/core/proto:base_options_java_proto_lite",
         "//mediapipe/tasks/cc/text/text_classifier/proto:text_classifier_graph_options_java_proto_lite",
-        "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers:category",
+        "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers:classificationresult",
-        "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers:classification_entry",
-        "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers:classifications",
         "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/processors:classifieroptions",
         "//mediapipe/tasks/java/com/google/mediapipe/tasks/core",
         "//mediapipe/tasks/java/com/google/mediapipe/tasks/text:libmediapipe_tasks_text_jni_lib",

mediapipe/tasks/java/com/google/mediapipe/tasks/text/textclassifier/TextClassificationResult.java

@@ -1,103 +0,0 @@
-// Copyright 2022 The MediaPipe Authors. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.mediapipe.tasks.text.textclassifier;
-
-import com.google.auto.value.AutoValue;
-import com.google.mediapipe.tasks.components.containers.Category;
-import com.google.mediapipe.tasks.components.containers.ClassificationEntry;
-import com.google.mediapipe.tasks.components.containers.Classifications;
-import com.google.mediapipe.tasks.components.containers.proto.CategoryProto;
-import com.google.mediapipe.tasks.components.containers.proto.ClassificationsProto;
-import com.google.mediapipe.tasks.core.TaskResult;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-
-/** Represents the classification results generated by {@link TextClassifier}. */
-@AutoValue
-public abstract class TextClassificationResult implements TaskResult {
-
-  /**
-   * Creates an {@link TextClassificationResult} instance from a {@link
-   * ClassificationsProto.ClassificationResult} protobuf message.
-   *
-   * @param classificationResult a {@link ClassificationsProto.ClassificationResult} protobuf
-   *     message.
-   * @param timestampMs a timestamp for this result.
-   */
-  // TODO: consolidate output formats across platforms.
-  static TextClassificationResult create(
-      ClassificationsProto.ClassificationResult classificationResult, long timestampMs) {
-    List<Classifications> classifications = new ArrayList<>();
-    for (ClassificationsProto.Classifications classificationsProto :
-        classificationResult.getClassificationsList()) {
-      classifications.add(classificationsFromProto(classificationsProto));
-    }
-    return new AutoValue_TextClassificationResult(
-        timestampMs, Collections.unmodifiableList(classifications));
-  }
-
-  @Override
-  public abstract long timestampMs();
-
-  /** Contains one set of results per classifier head. */
-  @SuppressWarnings("AutoValueImmutableFields")
-  public abstract List<Classifications> classifications();
-
-  /**
-   * Converts a {@link CategoryProto.Category} protobuf message to a {@link Category} object.
-   *
-   * @param category the {@link CategoryProto.Category} protobuf message to convert.
-   */
-  static Category categoryFromProto(CategoryProto.Category category) {
-    return Category.create(
-        category.getScore(),
-        category.getIndex(),
-        category.getCategoryName(),
-        category.getDisplayName());
-  }
-
-  /**
-   * Converts a {@link ClassificationsProto.ClassificationEntry} protobuf message to a {@link
-   * ClassificationEntry} object.
-   *
-   * @param entry the {@link ClassificationsProto.ClassificationEntry} protobuf message to convert.
-   */
-  static ClassificationEntry classificationEntryFromProto(
-      ClassificationsProto.ClassificationEntry entry) {
-    List<Category> categories = new ArrayList<>();
-    for (CategoryProto.Category category : entry.getCategoriesList()) {
-      categories.add(categoryFromProto(category));
-    }
-    return ClassificationEntry.create(categories, entry.getTimestampMs());
-  }
-
-  /**
-   * Converts a {@link ClassificationsProto.Classifications} protobuf message to a {@link
-   * Classifications} object.
-   *
-   * @param classifications the {@link ClassificationsProto.Classifications} protobuf message to
-   *     convert.
-   */
-  static Classifications classificationsFromProto(
-      ClassificationsProto.Classifications classifications) {
-    List<ClassificationEntry> entries = new ArrayList<>();
-    for (ClassificationsProto.ClassificationEntry entry : classifications.getEntriesList()) {
-      entries.add(classificationEntryFromProto(entry));
-    }
-    return Classifications.create(
-        entries, classifications.getHeadIndex(), classifications.getHeadName());
-  }
-}

mediapipe/tasks/java/com/google/mediapipe/tasks/text/textclassifier/TextClassifier.java

@@ -22,6 +22,7 @@ import com.google.mediapipe.framework.MediaPipeException;
 import com.google.mediapipe.framework.Packet;
 import com.google.mediapipe.framework.PacketGetter;
 import com.google.mediapipe.framework.ProtoUtil;
+import com.google.mediapipe.tasks.components.containers.ClassificationResult;
 import com.google.mediapipe.tasks.components.containers.proto.ClassificationsProto;
 import com.google.mediapipe.tasks.components.processors.ClassifierOptions;
 import com.google.mediapipe.tasks.core.BaseOptions;
@@ -86,10 +87,9 @@ public final class TextClassifier implements AutoCloseable {
 
   @SuppressWarnings("ConstantCaseForConstants")
   private static final List<String> OUTPUT_STREAMS =
-      Collections.unmodifiableList(
+      Collections.unmodifiableList(Arrays.asList("CLASSIFICATIONS:classifications_out"));
-          Arrays.asList("CLASSIFICATION_RESULT:classification_result_out"));
 
-  private static final int CLASSIFICATION_RESULT_OUT_STREAM_INDEX = 0;
+  private static final int CLASSIFICATIONS_OUT_STREAM_INDEX = 0;
   private static final String TASK_GRAPH_NAME =
       "mediapipe.tasks.text.text_classifier.TextClassifierGraph";
   private final TaskRunner runner;
@@ -142,17 +142,18 @@ public final class TextClassifier implements AutoCloseable {
    * @throws MediaPipeException if there is an error during {@link TextClassifier} creation.
    */
   public static TextClassifier createFromOptions(Context context, TextClassifierOptions options) {
-    OutputHandler<TextClassificationResult, Void> handler = new OutputHandler<>();
+    OutputHandler<TextClassifierResult, Void> handler = new OutputHandler<>();
     handler.setOutputPacketConverter(
-        new OutputHandler.OutputPacketConverter<TextClassificationResult, Void>() {
+        new OutputHandler.OutputPacketConverter<TextClassifierResult, Void>() {
           @Override
-          public TextClassificationResult convertToTaskResult(List<Packet> packets) {
+          public TextClassifierResult convertToTaskResult(List<Packet> packets) {
             try {
-              return TextClassificationResult.create(
+              return TextClassifierResult.create(
+                  ClassificationResult.createFromProto(
                       PacketGetter.getProto(
-                      packets.get(CLASSIFICATION_RESULT_OUT_STREAM_INDEX),
+                          packets.get(CLASSIFICATIONS_OUT_STREAM_INDEX),
-                      ClassificationsProto.ClassificationResult.getDefaultInstance()),
+                          ClassificationsProto.ClassificationResult.getDefaultInstance())),
-                  packets.get(CLASSIFICATION_RESULT_OUT_STREAM_INDEX).getTimestamp());
+                  packets.get(CLASSIFICATIONS_OUT_STREAM_INDEX).getTimestamp());
             } catch (IOException e) {
               throw new MediaPipeException(
                   MediaPipeException.StatusCode.INTERNAL.ordinal(), e.getMessage());
@@ -192,10 +193,10 @@ public final class TextClassifier implements AutoCloseable {
    *
    * @param inputText a {@link String} for processing.
    */
-  public TextClassificationResult classify(String inputText) {
+  public TextClassifierResult classify(String inputText) {
     Map<String, Packet> inputPackets = new HashMap<>();
     inputPackets.put(TEXT_IN_STREAM_NAME, runner.getPacketCreator().createString(inputText));
-    return (TextClassificationResult) runner.process(inputPackets);
+    return (TextClassifierResult) runner.process(inputPackets);
   }
 
   /** Closes and cleans up the {@link TextClassifier}. */

mediapipe/tasks/java/com/google/mediapipe/tasks/text/textclassifier/TextClassifierResult.java

@@ -0,0 +1,55 @@
+// Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.mediapipe.tasks.text.textclassifier;
+
+import com.google.auto.value.AutoValue;
+import com.google.mediapipe.tasks.components.containers.ClassificationResult;
+import com.google.mediapipe.tasks.components.containers.proto.ClassificationsProto;
+import com.google.mediapipe.tasks.core.TaskResult;
+
+/** Represents the classification results generated by {@link TextClassifier}. */
+@AutoValue
+public abstract class TextClassifierResult implements TaskResult {
+
+  /**
+   * Creates an {@link TextClassifierResult} instance.
+   *
+   * @param classificationResult the {@link ClassificationResult} object containing one set of
+   *     results per classifier head.
+   * @param timestampMs a timestamp for this result.
+   */
+  static TextClassifierResult create(ClassificationResult classificationResult, long timestampMs) {
+    return new AutoValue_TextClassifierResult(classificationResult, timestampMs);
+  }
+
+  /**
+   * Creates an {@link TextClassifierResult} instance from a {@link
+   * ClassificationsProto.ClassificationResult} protobuf message.
+   *
+   * @param proto the {@link ClassificationsProto.ClassificationResult} protobuf message to convert.
+   * @param timestampMs a timestamp for this result.
+   */
+  // TODO: consolidate output formats across platforms.
+  static TextClassifierResult createFromProto(
+      ClassificationsProto.ClassificationResult proto, long timestampMs) {
+    return create(ClassificationResult.createFromProto(proto), timestampMs);
+  }
+
+  /** Contains one set of results per classifier head. */
+  public abstract ClassificationResult classificationResult();
+
+  @Override
+  public abstract long timestampMs();
+}

mediapipe/tasks/java/com/google/mediapipe/tasks/vision/BUILD

@@ -84,8 +84,8 @@ android_library(
 android_library(
     name = "imageclassifier",
     srcs = [
-        "imageclassifier/ImageClassificationResult.java",
         "imageclassifier/ImageClassifier.java",
+        "imageclassifier/ImageClassifierResult.java",
     ],
     javacopts = [
         "-Xep:AndroidJdkLibsChecker:OFF",
@@ -100,9 +100,7 @@ android_library(
         "//mediapipe/tasks/cc/components/containers/proto:classifications_java_proto_lite",
         "//mediapipe/tasks/cc/core/proto:base_options_java_proto_lite",
         "//mediapipe/tasks/cc/vision/image_classifier/proto:image_classifier_graph_options_java_proto_lite",
-        "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers:category",
+        "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers:classificationresult",
-        "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers:classification_entry",
-        "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers:classifications",
         "//mediapipe/tasks/java/com/google/mediapipe/tasks/components/processors:classifieroptions",
         "//mediapipe/tasks/java/com/google/mediapipe/tasks/core",
         "//third_party:autovalue",

mediapipe/tasks/java/com/google/mediapipe/tasks/vision/imageclassifier/ImageClassificationResult.java

@@ -1,102 +0,0 @@
-// Copyright 2022 The MediaPipe Authors. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.mediapipe.tasks.vision.imageclassifier;
-
-import com.google.auto.value.AutoValue;
-import com.google.mediapipe.tasks.components.containers.Category;
-import com.google.mediapipe.tasks.components.containers.ClassificationEntry;
-import com.google.mediapipe.tasks.components.containers.Classifications;
-import com.google.mediapipe.tasks.components.containers.proto.CategoryProto;
-import com.google.mediapipe.tasks.components.containers.proto.ClassificationsProto;
-import com.google.mediapipe.tasks.core.TaskResult;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-
-/** Represents the classification results generated by {@link ImageClassifier}. */
-@AutoValue
-public abstract class ImageClassificationResult implements TaskResult {
-
-  /**
-   * Creates an {@link ImageClassificationResult} instance from a {@link
-   * ClassificationsProto.ClassificationResult} protobuf message.
-   *
-   * @param classificationResult a {@link ClassificationsProto.ClassificationResult} protobuf
-   *     message.
-   * @param timestampMs a timestamp for this result.
-   */
-  // TODO: consolidate output formats across platforms.
-  static ImageClassificationResult create(
-      ClassificationsProto.ClassificationResult classificationResult, long timestampMs) {
-    List<Classifications> classifications = new ArrayList<>();
-    for (ClassificationsProto.Classifications classificationsProto :
-        classificationResult.getClassificationsList()) {
-      classifications.add(classificationsFromProto(classificationsProto));
-    }
-    return new AutoValue_ImageClassificationResult(
-        timestampMs, Collections.unmodifiableList(classifications));
-  }
-
-  @Override
-  public abstract long timestampMs();
-
-  /** Contains one set of results per classifier head. */
-  public abstract List<Classifications> classifications();
-
-  /**
-   * Converts a {@link CategoryProto.Category} protobuf message to a {@link Category} object.
-   *
-   * @param category the {@link CategoryProto.Category} protobuf message to convert.
-   */
-  static Category categoryFromProto(CategoryProto.Category category) {
-    return Category.create(
-        category.getScore(),
-        category.getIndex(),
-        category.getCategoryName(),
-        category.getDisplayName());
-  }
-
-  /**
-   * Converts a {@link ClassificationsProto.ClassificationEntry} protobuf message to a {@link
-   * ClassificationEntry} object.
-   *
-   * @param entry the {@link ClassificationsProto.ClassificationEntry} protobuf message to convert.
-   */
-  static ClassificationEntry classificationEntryFromProto(
-      ClassificationsProto.ClassificationEntry entry) {
-    List<Category> categories = new ArrayList<>();
-    for (CategoryProto.Category category : entry.getCategoriesList()) {
-      categories.add(categoryFromProto(category));
-    }
-    return ClassificationEntry.create(categories, entry.getTimestampMs());
-  }
-
-  /**
-   * Converts a {@link ClassificationsProto.Classifications} protobuf message to a {@link
-   * Classifications} object.
-   *
-   * @param classifications the {@link ClassificationsProto.Classifications} protobuf message to
-   *     convert.
-   */
-  static Classifications classificationsFromProto(
-      ClassificationsProto.Classifications classifications) {
-    List<ClassificationEntry> entries = new ArrayList<>();
-    for (ClassificationsProto.ClassificationEntry entry : classifications.getEntriesList()) {
-      entries.add(classificationEntryFromProto(entry));
-    }
-    return Classifications.create(
-        entries, classifications.getHeadIndex(), classifications.getHeadName());
-  }
-}

mediapipe/tasks/java/com/google/mediapipe/tasks/vision/imageclassifier/ImageClassifier.java

@@ -25,6 +25,7 @@ import com.google.mediapipe.framework.PacketGetter;
 import com.google.mediapipe.framework.ProtoUtil;
 import com.google.mediapipe.framework.image.BitmapImageBuilder;
 import com.google.mediapipe.framework.image.MPImage;
+import com.google.mediapipe.tasks.components.containers.ClassificationResult;
 import com.google.mediapipe.tasks.components.containers.proto.ClassificationsProto;
 import com.google.mediapipe.tasks.components.processors.ClassifierOptions;
 import com.google.mediapipe.tasks.core.BaseOptions;
@@ -96,8 +97,8 @@ public final class ImageClassifier extends BaseVisionTaskApi {
           Arrays.asList("IMAGE:" + IMAGE_IN_STREAM_NAME, "NORM_RECT:" + NORM_RECT_IN_STREAM_NAME));
   private static final List<String> OUTPUT_STREAMS =
       Collections.unmodifiableList(
-          Arrays.asList("CLASSIFICATION_RESULT:classification_result_out", "IMAGE:image_out"));
+          Arrays.asList("CLASSIFICATIONS:classifications_out", "IMAGE:image_out"));
-  private static final int CLASSIFICATION_RESULT_OUT_STREAM_INDEX = 0;
+  private static final int CLASSIFICATIONS_OUT_STREAM_INDEX = 0;
   private static final int IMAGE_OUT_STREAM_INDEX = 1;
   private static final String TASK_GRAPH_NAME =
       "mediapipe.tasks.vision.image_classifier.ImageClassifierGraph";
@@ -164,17 +165,18 @@ public final class ImageClassifier extends BaseVisionTaskApi {
    * @throws MediaPipeException if there is an error during {@link ImageClassifier} creation.
    */
   public static ImageClassifier createFromOptions(Context context, ImageClassifierOptions options) {
-    OutputHandler<ImageClassificationResult, MPImage> handler = new OutputHandler<>();
+    OutputHandler<ImageClassifierResult, MPImage> handler = new OutputHandler<>();
     handler.setOutputPacketConverter(
-        new OutputHandler.OutputPacketConverter<ImageClassificationResult, MPImage>() {
+        new OutputHandler.OutputPacketConverter<ImageClassifierResult, MPImage>() {
           @Override
-          public ImageClassificationResult convertToTaskResult(List<Packet> packets) {
+          public ImageClassifierResult convertToTaskResult(List<Packet> packets) {
             try {
-              return ImageClassificationResult.create(
+              return ImageClassifierResult.create(
+                  ClassificationResult.createFromProto(
                       PacketGetter.getProto(
-                      packets.get(CLASSIFICATION_RESULT_OUT_STREAM_INDEX),
+                          packets.get(CLASSIFICATIONS_OUT_STREAM_INDEX),
-                      ClassificationsProto.ClassificationResult.getDefaultInstance()),
+                          ClassificationsProto.ClassificationResult.getDefaultInstance())),
-                  packets.get(CLASSIFICATION_RESULT_OUT_STREAM_INDEX).getTimestamp());
+                  packets.get(CLASSIFICATIONS_OUT_STREAM_INDEX).getTimestamp());
             } catch (IOException e) {
               throw new MediaPipeException(
                   MediaPipeException.StatusCode.INTERNAL.ordinal(), e.getMessage());
@@ -229,7 +231,7 @@ public final class ImageClassifier extends BaseVisionTaskApi {
    * @param image a MediaPipe {@link MPImage} object for processing.
    * @throws MediaPipeException if there is an internal error.
    */
-  public ImageClassificationResult classify(MPImage image) {
+  public ImageClassifierResult classify(MPImage image) {
     return classify(image, ImageProcessingOptions.builder().build());
   }
 
@@ -248,9 +250,9 @@ public final class ImageClassifier extends BaseVisionTaskApi {
    *     input image before running inference.
    * @throws MediaPipeException if there is an internal error.
    */
-  public ImageClassificationResult classify(
+  public ImageClassifierResult classify(
       MPImage image, ImageProcessingOptions imageProcessingOptions) {
-    return (ImageClassificationResult) processImageData(image, imageProcessingOptions);
+    return (ImageClassifierResult) processImageData(image, imageProcessingOptions);
   }
 
   /**
@@ -271,7 +273,7 @@ public final class ImageClassifier extends BaseVisionTaskApi {
    * @param timestampMs the input timestamp (in milliseconds).
    * @throws MediaPipeException if there is an internal error.
    */
-  public ImageClassificationResult classifyForVideo(MPImage image, long timestampMs) {
+  public ImageClassifierResult classifyForVideo(MPImage image, long timestampMs) {
     return classifyForVideo(image, ImageProcessingOptions.builder().build(), timestampMs);
   }
 
@@ -294,9 +296,9 @@ public final class ImageClassifier extends BaseVisionTaskApi {
    * @param timestampMs the input timestamp (in milliseconds).
    * @throws MediaPipeException if there is an internal error.
    */
-  public ImageClassificationResult classifyForVideo(
+  public ImageClassifierResult classifyForVideo(
       MPImage image, ImageProcessingOptions imageProcessingOptions, long timestampMs) {
-    return (ImageClassificationResult) processVideoData(image, imageProcessingOptions, timestampMs);
+    return (ImageClassifierResult) processVideoData(image, imageProcessingOptions, timestampMs);
   }
 
   /**
@@ -383,7 +385,7 @@ public final class ImageClassifier extends BaseVisionTaskApi {
        * the image classifier is in the live stream mode.
        */
       public abstract Builder setResultListener(
-          ResultListener<ImageClassificationResult, MPImage> resultListener);
+          ResultListener<ImageClassifierResult, MPImage> resultListener);
 
       /** Sets an optional {@link ErrorListener}. */
       public abstract Builder setErrorListener(ErrorListener errorListener);
@@ -420,7 +422,7 @@ public final class ImageClassifier extends BaseVisionTaskApi {
 
     abstract Optional<ClassifierOptions> classifierOptions();
 
-    abstract Optional<ResultListener<ImageClassificationResult, MPImage>> resultListener();
+    abstract Optional<ResultListener<ImageClassifierResult, MPImage>> resultListener();
 
     abstract Optional<ErrorListener> errorListener();
 

mediapipe/tasks/java/com/google/mediapipe/tasks/vision/imageclassifier/ImageClassifierResult.java

@@ -0,0 +1,55 @@
+// Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.mediapipe.tasks.vision.imageclassifier;
+
+import com.google.auto.value.AutoValue;
+import com.google.mediapipe.tasks.components.containers.ClassificationResult;
+import com.google.mediapipe.tasks.components.containers.proto.ClassificationsProto;
+import com.google.mediapipe.tasks.core.TaskResult;
+
+/** Represents the classification results generated by {@link ImageClassifier}. */
+@AutoValue
+public abstract class ImageClassifierResult implements TaskResult {
+
+  /**
+   * Creates an {@link ImageClassifierResult} instance.
+   *
+   * @param classificationResult the {@link ClassificationResult} object containing one set of
+   *     results per classifier head.
+   * @param timestampMs a timestamp for this result.
+   */
+  static ImageClassifierResult create(ClassificationResult classificationResult, long timestampMs) {
+    return new AutoValue_ImageClassifierResult(classificationResult, timestampMs);
+  }
+
+  /**
+   * Creates an {@link ImageClassifierResult} instance from a {@link
+   * ClassificationsProto.ClassificationResult} protobuf message.
+   *
+   * @param proto the {@link ClassificationsProto.ClassificationResult} protobuf message to convert.
+   * @param timestampMs a timestamp for this result.
+   */
+  // TODO: consolidate output formats across platforms.
+  static ImageClassifierResult createFromProto(
+      ClassificationsProto.ClassificationResult proto, long timestampMs) {
+    return create(ClassificationResult.createFromProto(proto), timestampMs);
+  }
+
+  /** Contains one set of results per classifier head. */
+  public abstract ClassificationResult classificationResult();
+
+  @Override
+  public abstract long timestampMs();
+}

mediapipe/tasks/javatests/com/google/mediapipe/tasks/text/textclassifier/TextClassifierTest.java

@@ -76,7 +76,7 @@ public class TextClassifierTest {
   public void classify_succeedsWithBert() throws Exception {
     TextClassifier textClassifier =
         TextClassifier.createFromFile(ApplicationProvider.getApplicationContext(), BERT_MODEL_FILE);
-    TextClassificationResult negativeResults = textClassifier.classify(NEGATIVE_TEXT);
+    TextClassifierResult negativeResults = textClassifier.classify(NEGATIVE_TEXT);
     assertHasOneHead(negativeResults);
     assertCategoriesAre(
         negativeResults,
@@ -84,7 +84,7 @@ public class TextClassifierTest {
             Category.create(0.95630914f, 0, "negative", ""),
             Category.create(0.04369091f, 1, "positive", "")));
 
-    TextClassificationResult positiveResults = textClassifier.classify(POSITIVE_TEXT);
+    TextClassifierResult positiveResults = textClassifier.classify(POSITIVE_TEXT);
     assertHasOneHead(positiveResults);
     assertCategoriesAre(
         positiveResults,
@@ -99,7 +99,7 @@ public class TextClassifierTest {
         TextClassifier.createFromFile(
             ApplicationProvider.getApplicationContext(),
             TestUtils.loadFile(ApplicationProvider.getApplicationContext(), BERT_MODEL_FILE));
-    TextClassificationResult negativeResults = textClassifier.classify(NEGATIVE_TEXT);
+    TextClassifierResult negativeResults = textClassifier.classify(NEGATIVE_TEXT);
     assertHasOneHead(negativeResults);
     assertCategoriesAre(
         negativeResults,
@@ -107,7 +107,7 @@ public class TextClassifierTest {
             Category.create(0.95630914f, 0, "negative", ""),
             Category.create(0.04369091f, 1, "positive", "")));
 
-    TextClassificationResult positiveResults = textClassifier.classify(POSITIVE_TEXT);
+    TextClassifierResult positiveResults = textClassifier.classify(POSITIVE_TEXT);
     assertHasOneHead(positiveResults);
     assertHasOneHead(positiveResults);
     assertCategoriesAre(
@@ -122,7 +122,7 @@ public class TextClassifierTest {
     TextClassifier textClassifier =
         TextClassifier.createFromFile(
             ApplicationProvider.getApplicationContext(), REGEX_MODEL_FILE);
-    TextClassificationResult negativeResults = textClassifier.classify(NEGATIVE_TEXT);
+    TextClassifierResult negativeResults = textClassifier.classify(NEGATIVE_TEXT);
     assertHasOneHead(negativeResults);
     assertCategoriesAre(
         negativeResults,
@@ -130,7 +130,7 @@ public class TextClassifierTest {
             Category.create(0.6647746f, 0, "Negative", ""),
             Category.create(0.33522537f, 1, "Positive", "")));
 
-    TextClassificationResult positiveResults = textClassifier.classify(POSITIVE_TEXT);
+    TextClassifierResult positiveResults = textClassifier.classify(POSITIVE_TEXT);
     assertHasOneHead(positiveResults);
     assertCategoriesAre(
         positiveResults,
@@ -139,16 +139,15 @@ public class TextClassifierTest {
             Category.create(0.48799595f, 1, "Positive", "")));
   }
 
-  private static void assertHasOneHead(TextClassificationResult results) {
+  private static void assertHasOneHead(TextClassifierResult results) {
-    assertThat(results.classifications()).hasSize(1);
+    assertThat(results.classificationResult().classifications()).hasSize(1);
-    assertThat(results.classifications().get(0).headIndex()).isEqualTo(0);
+    assertThat(results.classificationResult().classifications().get(0).headIndex()).isEqualTo(0);
-    assertThat(results.classifications().get(0).headName()).isEqualTo("probability");
+    assertThat(results.classificationResult().classifications().get(0).headName().get())
-    assertThat(results.classifications().get(0).entries()).hasSize(1);
+        .isEqualTo("probability");
   }
 
-  private static void assertCategoriesAre(
+  private static void assertCategoriesAre(TextClassifierResult results, List<Category> categories) {
-      TextClassificationResult results, List<Category> categories) {
+    assertThat(results.classificationResult().classifications().get(0).categories())
-    assertThat(results.classifications().get(0).entries().get(0).categories())
         .isEqualTo(categories);
   }
 }

mediapipe/tasks/javatests/com/google/mediapipe/tasks/vision/imageclassifier/ImageClassifierTest.java

@@ -91,11 +91,12 @@ public class ImageClassifierTest {
       ImageClassifier imageClassifier =
           ImageClassifier.createFromFile(
               ApplicationProvider.getApplicationContext(), FLOAT_MODEL_FILE);
-      ImageClassificationResult results = imageClassifier.classify(getImageFromAsset(BURGER_IMAGE));
+      ImageClassifierResult results = imageClassifier.classify(getImageFromAsset(BURGER_IMAGE));
 
-      assertHasOneHeadAndOneTimestamp(results, 0);
+      assertHasOneHead(results);
-      assertThat(results.classifications().get(0).entries().get(0).categories()).hasSize(1001);
+      assertThat(results.classificationResult().classifications().get(0).categories())
-      assertThat(results.classifications().get(0).entries().get(0).categories().get(0))
+          .hasSize(1001);
+      assertThat(results.classificationResult().classifications().get(0).categories().get(0))
           .isEqualTo(Category.create(0.7952058f, 934, "cheeseburger", ""));
     }
 
@@ -108,9 +109,9 @@ public class ImageClassifierTest {
               .build();
       ImageClassifier imageClassifier =
           ImageClassifier.createFromOptions(ApplicationProvider.getApplicationContext(), options);
-      ImageClassificationResult results = imageClassifier.classify(getImageFromAsset(BURGER_IMAGE));
+      ImageClassifierResult results = imageClassifier.classify(getImageFromAsset(BURGER_IMAGE));
 
-      assertHasOneHeadAndOneTimestamp(results, 0);
+      assertHasOneHead(results);
       assertCategoriesAre(
           results,
           Arrays.asList(
@@ -128,9 +129,9 @@ public class ImageClassifierTest {
               .build();
       ImageClassifier imageClassifier =
           ImageClassifier.createFromOptions(ApplicationProvider.getApplicationContext(), options);
-      ImageClassificationResult results = imageClassifier.classify(getImageFromAsset(BURGER_IMAGE));
+      ImageClassifierResult results = imageClassifier.classify(getImageFromAsset(BURGER_IMAGE));
 
-      assertHasOneHeadAndOneTimestamp(results, 0);
+      assertHasOneHead(results);
       assertCategoriesAre(
           results, Arrays.asList(Category.create(0.97265625f, 934, "cheeseburger", "")));
     }
@@ -144,9 +145,9 @@ public class ImageClassifierTest {
               .build();
       ImageClassifier imageClassifier =
           ImageClassifier.createFromOptions(ApplicationProvider.getApplicationContext(), options);
-      ImageClassificationResult results = imageClassifier.classify(getImageFromAsset(BURGER_IMAGE));
+      ImageClassifierResult results = imageClassifier.classify(getImageFromAsset(BURGER_IMAGE));
 
-      assertHasOneHeadAndOneTimestamp(results, 0);
+      assertHasOneHead(results);
       assertCategoriesAre(
           results,
           Arrays.asList(
@@ -166,9 +167,9 @@ public class ImageClassifierTest {
               .build();
       ImageClassifier imageClassifier =
           ImageClassifier.createFromOptions(ApplicationProvider.getApplicationContext(), options);
-      ImageClassificationResult results = imageClassifier.classify(getImageFromAsset(BURGER_IMAGE));
+      ImageClassifierResult results = imageClassifier.classify(getImageFromAsset(BURGER_IMAGE));
 
-      assertHasOneHeadAndOneTimestamp(results, 0);
+      assertHasOneHead(results);
       assertCategoriesAre(
           results,
           Arrays.asList(
@@ -190,9 +191,9 @@ public class ImageClassifierTest {
               .build();
       ImageClassifier imageClassifier =
           ImageClassifier.createFromOptions(ApplicationProvider.getApplicationContext(), options);
-      ImageClassificationResult results = imageClassifier.classify(getImageFromAsset(BURGER_IMAGE));
+      ImageClassifierResult results = imageClassifier.classify(getImageFromAsset(BURGER_IMAGE));
 
-      assertHasOneHeadAndOneTimestamp(results, 0);
+      assertHasOneHead(results);
       assertCategoriesAre(
           results,
           Arrays.asList(
@@ -214,10 +215,10 @@ public class ImageClassifierTest {
       RectF roi = new RectF(0.450f, 0.308f, 0.614f, 0.734f);
       ImageProcessingOptions imageProcessingOptions =
           ImageProcessingOptions.builder().setRegionOfInterest(roi).build();
-      ImageClassificationResult results =
+      ImageClassifierResult results =
           imageClassifier.classify(getImageFromAsset(MULTI_OBJECTS_IMAGE), imageProcessingOptions);
 
-      assertHasOneHeadAndOneTimestamp(results, 0);
+      assertHasOneHead(results);
       assertCategoriesAre(
           results, Arrays.asList(Category.create(0.9969325f, 806, "soccer ball", "")));
     }
@@ -233,10 +234,10 @@ public class ImageClassifierTest {
           ImageClassifier.createFromOptions(ApplicationProvider.getApplicationContext(), options);
       ImageProcessingOptions imageProcessingOptions =
           ImageProcessingOptions.builder().setRotationDegrees(-90).build();
-      ImageClassificationResult results =
+      ImageClassifierResult results =
           imageClassifier.classify(getImageFromAsset(BURGER_ROTATED_IMAGE), imageProcessingOptions);
 
-      assertHasOneHeadAndOneTimestamp(results, 0);
+      assertHasOneHead(results);
       assertCategoriesAre(
           results,
           Arrays.asList(
@@ -258,11 +259,11 @@ public class ImageClassifierTest {
       RectF roi = new RectF(0.0f, 0.1763f, 0.5642f, 0.3049f);
       ImageProcessingOptions imageProcessingOptions =
           ImageProcessingOptions.builder().setRegionOfInterest(roi).setRotationDegrees(-90).build();
-      ImageClassificationResult results =
+      ImageClassifierResult results =
           imageClassifier.classify(
               getImageFromAsset(MULTI_OBJECTS_ROTATED_IMAGE), imageProcessingOptions);
 
-      assertHasOneHeadAndOneTimestamp(results, 0);
+      assertHasOneHead(results);
       assertCategoriesAre(
           results, Arrays.asList(Category.create(0.686824f, 560, "folding chair", "")));
     }
@@ -391,9 +392,9 @@ public class ImageClassifierTest {
               .build();
       ImageClassifier imageClassifier =
           ImageClassifier.createFromOptions(ApplicationProvider.getApplicationContext(), options);
-      ImageClassificationResult results = imageClassifier.classify(getImageFromAsset(BURGER_IMAGE));
+      ImageClassifierResult results = imageClassifier.classify(getImageFromAsset(BURGER_IMAGE));
 
-      assertHasOneHeadAndOneTimestamp(results, 0);
+      assertHasOneHead(results);
       assertCategoriesAre(
           results, Arrays.asList(Category.create(0.7952058f, 934, "cheeseburger", "")));
     }
@@ -410,9 +411,8 @@ public class ImageClassifierTest {
       ImageClassifier imageClassifier =
           ImageClassifier.createFromOptions(ApplicationProvider.getApplicationContext(), options);
       for (int i = 0; i < 3; i++) {
-        ImageClassificationResult results =
+        ImageClassifierResult results = imageClassifier.classifyForVideo(image, /*timestampMs=*/ i);
-            imageClassifier.classifyForVideo(image, /*timestampMs=*/ i);
+        assertHasOneHead(results);
-        assertHasOneHeadAndOneTimestamp(results, i);
         assertCategoriesAre(
             results, Arrays.asList(Category.create(0.7952058f, 934, "cheeseburger", "")));
       }
@@ -478,24 +478,17 @@ public class ImageClassifierTest {
     return new BitmapImageBuilder(BitmapFactory.decodeStream(istr)).build();
   }
 
-  private static void assertHasOneHeadAndOneTimestamp(
+  private static void assertHasOneHead(ImageClassifierResult results) {
-      ImageClassificationResult results, long timestampMs) {
+    assertThat(results.classificationResult().classifications()).hasSize(1);
-    assertThat(results.classifications()).hasSize(1);
+    assertThat(results.classificationResult().classifications().get(0).headIndex()).isEqualTo(0);
-    assertThat(results.classifications().get(0).headIndex()).isEqualTo(0);
+    assertThat(results.classificationResult().classifications().get(0).headName().get())
-    assertThat(results.classifications().get(0).headName()).isEqualTo("probability");
+        .isEqualTo("probability");
-    assertThat(results.classifications().get(0).entries()).hasSize(1);
-    assertThat(results.classifications().get(0).entries().get(0).timestampMs())
-        .isEqualTo(timestampMs);
   }
 
   private static void assertCategoriesAre(
-      ImageClassificationResult results, List<Category> categories) {
+      ImageClassifierResult results, List<Category> categories) {
-    assertThat(results.classifications().get(0).entries().get(0).categories())
+    assertThat(results.classificationResult().classifications().get(0).categories())
-        .hasSize(categories.size());
+        .isEqualTo(categories);
-    for (int i = 0; i < categories.size(); i++) {
-      assertThat(results.classifications().get(0).entries().get(0).categories().get(i))
-          .isEqualTo(categories.get(i));
-    }
   }
 
   private static void assertImageSizeIsExpected(MPImage inputImage) {

mediapipe/tasks/python/metadata/metadata_writers/BUILD

@@ -43,3 +43,9 @@ py_library(
     srcs = ["image_classifier.py"],
     deps = [":metadata_writer"],
 )
+
+py_library(
+    name = "text_classifier",
+    srcs = ["text_classifier.py"],
+    deps = [":metadata_writer"],
+)

mediapipe/tasks/python/metadata/metadata_writers/image_classifier.py

@@ -62,10 +62,10 @@ class MetadataWriter(metadata_writer.MetadataWriterBase):
         https://github.com/google/mediapipe/blob/f8af41b1eb49ff4bdad756ff19d1d36f486be614/mediapipe/tasks/metadata/metadata_schema.fbs#L456
 
     Returns:
-      An MetadataWrite object.
+      A MetadataWriter object.
     """
     writer = metadata_writer.MetadataWriter(model_buffer)
-    writer.add_genernal_info(_MODEL_NAME, _MODEL_DESCRIPTION)
+    writer.add_general_info(_MODEL_NAME, _MODEL_DESCRIPTION)
     writer.add_image_input(input_norm_mean, input_norm_std)
     writer.add_classification_output(labels, score_calibration)
     return cls(writer)

mediapipe/tasks/python/metadata/metadata_writers/metadata_info.py

@@ -228,6 +228,45 @@ class ScoreThresholdingMd:
     return score_thresholding
 
 
+class RegexTokenizerMd:
+  """A container for the Regex tokenizer [1] metadata information.
+
+  [1]:
+    https://github.com/google/mediapipe/blob/f8af41b1eb49ff4bdad756ff19d1d36f486be614/mediapipe/tasks/metadata/metadata_schema.fbs#L500
+  """
+
+  def __init__(self, delim_regex_pattern: str, vocab_file_path: str):
+    """Initializes a RegexTokenizerMd object.
+
+    Args:
+      delim_regex_pattern: the regular expression to segment strings and create
+        tokens.
+      vocab_file_path: path to the vocabulary file.
+    """
+    self._delim_regex_pattern = delim_regex_pattern
+    self._vocab_file_path = vocab_file_path
+
+  def create_metadata(self) -> _metadata_fb.ProcessUnitT:
+    """Creates the Regex tokenizer metadata based on the information.
+
+    Returns:
+      A Flatbuffers Python object of the Regex tokenizer metadata.
+    """
+    vocab = _metadata_fb.AssociatedFileT()
+    vocab.name = self._vocab_file_path
+    vocab.description = _VOCAB_FILE_DESCRIPTION
+    vocab.type = _metadata_fb.AssociatedFileType.VOCABULARY
+
+    # Create the RegexTokenizer.
+    tokenizer = _metadata_fb.ProcessUnitT()
+    tokenizer.optionsType = (
+        _metadata_fb.ProcessUnitOptions.RegexTokenizerOptions)
+    tokenizer.options = _metadata_fb.RegexTokenizerOptionsT()
+    tokenizer.options.delimRegexPattern = self._delim_regex_pattern
+    tokenizer.options.vocabFile = [vocab]
+    return tokenizer
+
+
 class TensorMd:
   """A container for common tensor metadata information.
 
@@ -397,6 +436,56 @@ class InputImageTensorMd(TensorMd):
     return tensor_metadata
 
 
+class InputTextTensorMd(TensorMd):
+  """A container for the input text tensor metadata information.
+
+  Attributes:
+    tokenizer_md: information of the tokenizer in the input text tensor, if any.
+  """
+
+  def __init__(self,
+               name: Optional[str] = None,
+               description: Optional[str] = None,
+               tokenizer_md: Optional[RegexTokenizerMd] = None):
+    """Initializes the instance of InputTextTensorMd.
+
+    Args:
+      name: name of the tensor.
+      description: description of what the tensor is.
+      tokenizer_md: information of the tokenizer in the input text tensor, if
+        any. Only `RegexTokenizer` [1] is currenly supported. If the tokenizer
+        is `BertTokenizer` [2] or `SentencePieceTokenizer` [3], refer to
+        `BertInputTensorsMd` class.
+      [1]:
+        https://github.com/google/mediapipe/blob/f8af41b1eb49ff4bdad756ff19d1d36f486be614/mediapipe/tasks/metadata/metadata_schema.fbs#L500
+      [2]:
+        https://github.com/google/mediapipe/blob/f8af41b1eb49ff4bdad756ff19d1d36f486be614/mediapipe/tasks/metadata/metadata_schema.fbs#L477
+      [3]:
+        https://github.com/google/mediapipe/blob/f8af41b1eb49ff4bdad756ff19d1d36f486be614/mediapipe/tasks/metadata/metadata_schema.fbs#L485
+    """
+    super().__init__(name, description)
+    self.tokenizer_md = tokenizer_md
+
+  def create_metadata(self) -> _metadata_fb.TensorMetadataT:
+    """Creates the input text metadata based on the information.
+
+    Returns:
+      A Flatbuffers Python object of the input text metadata.
+
+    Raises:
+      ValueError: if the type of tokenizer_md is unsupported.
+    """
+    if not isinstance(self.tokenizer_md, (type(None), RegexTokenizerMd)):
+      raise ValueError(
+          f"The type of tokenizer_options, {type(self.tokenizer_md)}, is "
+          f"unsupported")
+
+    tensor_metadata = super().create_metadata()
+    if self.tokenizer_md:
+      tensor_metadata.processUnits = [self.tokenizer_md.create_metadata()]
+    return tensor_metadata
+
+
 class ClassificationTensorMd(TensorMd):
   """A container for the classification tensor metadata information.
 

mediapipe/tasks/python/metadata/metadata_writers/metadata_writer.py

@@ -29,6 +29,9 @@ from mediapipe.tasks.python.metadata.metadata_writers import writer_utils
 
 _INPUT_IMAGE_NAME = 'image'
 _INPUT_IMAGE_DESCRIPTION = 'Input image to be processed.'
+_INPUT_REGEX_TEXT_NAME = 'input_text'
+_INPUT_REGEX_TEXT_DESCRIPTION = ('Embedding vectors representing the input '
+                                 'text to be processed.')
 _OUTPUT_CLASSIFICATION_NAME = 'score'
 _OUTPUT_CLASSIFICATION_DESCRIPTION = 'Score of the labels respectively.'
 
@@ -82,6 +85,22 @@ class ScoreThresholding:
   global_score_threshold: float
 
 
+@dataclasses.dataclass
+class RegexTokenizer:
+  """Parameters of the Regex tokenizer [1] metadata information.
+
+  [1]:
+    https://github.com/google/mediapipe/blob/f8af41b1eb49ff4bdad756ff19d1d36f486be614/mediapipe/tasks/metadata/metadata_schema.fbs#L500
+
+  Attributes:
+    delim_regex_pattern: the regular expression to segment strings and create
+      tokens.
+    vocab_file_path: path to the vocabulary file.
+  """
+  delim_regex_pattern: str
+  vocab_file_path: str
+
+
 class Labels(object):
   """Simple container holding classification labels of a particular tensor.
 
@@ -355,11 +374,11 @@ class MetadataWriter(object):
     if os.path.exists(self._temp_folder.name):
       self._temp_folder.cleanup()
 
-  def add_genernal_info(
+  def add_general_info(
       self,
       model_name: str,
       model_description: Optional[str] = None) -> 'MetadataWriter':
-    """Adds a genernal info metadata for the general metadata informantion."""
+    """Adds a general info metadata for the general metadata informantion."""
     # Will overwrite the previous `self._general_md` if exists.
     self._general_md = metadata_info.GeneralMd(
         name=model_name, description=model_description)
@@ -415,6 +434,34 @@ class MetadataWriter(object):
     self._input_mds.append(input_md)
     return self
 
+  def add_regex_text_input(
+      self,
+      regex_tokenizer: RegexTokenizer,
+      name: str = _INPUT_REGEX_TEXT_NAME,
+      description: str = _INPUT_REGEX_TEXT_DESCRIPTION) -> 'MetadataWriter':
+    """Adds an input text metadata for the text input with regex tokenizer.
+
+    Args:
+      regex_tokenizer: information of the regex tokenizer [1] used to process
+        the input string.
+      name: Name of the input tensor.
+      description: Description of the input tensor.
+
+    Returns:
+      The MetaWriter instance, can be used for chained operation.
+
+    [1]:
+      https://github.com/google/mediapipe/blob/f8af41b1eb49ff4bdad756ff19d1d36f486be614/mediapipe/tasks/metadata/metadata_schema.fbs#L500
+    """
+    tokenizer_md = metadata_info.RegexTokenizerMd(
+        delim_regex_pattern=regex_tokenizer.delim_regex_pattern,
+        vocab_file_path=regex_tokenizer.vocab_file_path)
+    input_md = metadata_info.InputTextTensorMd(
+        name=name, description=description, tokenizer_md=tokenizer_md)
+    self._input_mds.append(input_md)
+    self._associated_files.append(regex_tokenizer.vocab_file_path)
+    return self
+
   def add_classification_output(
       self,
       labels: Optional[Labels] = None,

mediapipe/tasks/python/metadata/metadata_writers/text_classifier.py

@@ -0,0 +1,64 @@
+# Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+"""Writes metadata and label file to the Text classifier models."""
+
+from mediapipe.tasks.python.metadata.metadata_writers import metadata_writer
+
+_MODEL_NAME = "TextClassifier"
+_MODEL_DESCRIPTION = ("Classify the input text into a set of known categories.")
+
+
+class MetadataWriter(metadata_writer.MetadataWriterBase):
+  """MetadataWriter to write the metadata into the text classifier."""
+
+  @classmethod
+  def create_for_regex_model(
+      cls, model_buffer: bytearray,
+      regex_tokenizer: metadata_writer.RegexTokenizer,
+      labels: metadata_writer.Labels) -> "MetadataWriter":
+    """Creates MetadataWriter for TFLite model with regex tokentizer.
+
+    The parameters required in this method are mandatory when using MediaPipe
+    Tasks.
+
+    Note that only the output TFLite is used for deployment. The output JSON
+    content is used to interpret the metadata content.
+
+    Args:
+      model_buffer: A valid flatbuffer loaded from the TFLite model file.
+      regex_tokenizer: information of the regex tokenizer [1] used to process
+        the input string. If the tokenizer is `BertTokenizer` [2] or
+        `SentencePieceTokenizer` [3], please refer to
+        `create_for_bert_model`.
+      labels: an instance of Labels helper class used in the output
+        classification tensor [4].
+
+      [1]:
+        https://github.com/google/mediapipe/blob/f8af41b1eb49ff4bdad756ff19d1d36f486be614/mediapipe/tasks/metadata/metadata_schema.fbs#L500
+      [2]:
+        https://github.com/google/mediapipe/blob/f8af41b1eb49ff4bdad756ff19d1d36f486be614/mediapipe/tasks/metadata/metadata_schema.fbs#L477
+      [3]:
+        https://github.com/google/mediapipe/blob/f8af41b1eb49ff4bdad756ff19d1d36f486be614/mediapipe/tasks/metadata/metadata_schema.fbs#L485
+      [4]:
+        https://github.com/google/mediapipe/blob/f8af41b1eb49ff4bdad756ff19d1d36f486be614/mediapipe/tasks/metadata/metadata_schema.fbs#L99
+
+    Returns:
+      A MetadataWriter object.
+    """
+    writer = metadata_writer.MetadataWriter(model_buffer)
+    writer.add_general_info(_MODEL_NAME, _MODEL_DESCRIPTION)
+    writer.add_regex_text_input(regex_tokenizer)
+    writer.add_classification_output(labels)
+    return cls(writer)

mediapipe/tasks/python/test/audio/audio_classifier_test.py

@@ -174,12 +174,10 @@ class AudioClassifierTest(parameterized.TestCase):
       self.assertIsInstance(classifier, _AudioClassifier)
 
   def test_create_from_options_fails_with_invalid_model_path(self):
-    # Invalid empty model path.
     with self.assertRaisesRegex(
-        ValueError,
+        RuntimeError, 'Unable to open file at /path/to/invalid/model.tflite'):
-        r"ExternalFile must specify at least one of 'file_content', "
+      base_options = _BaseOptions(
-        r"'file_name', 'file_pointer_meta' or 'file_descriptor_meta'."):
+          model_asset_path='/path/to/invalid/model.tflite')
-      base_options = _BaseOptions(model_asset_path='')
       options = _AudioClassifierOptions(base_options=base_options)
       _AudioClassifier.create_from_options(options)
 

mediapipe/tasks/python/test/metadata/metadata_writers/BUILD

@@ -53,3 +53,17 @@ py_test(
         "//mediapipe/tasks/python/test:test_utils",
     ],
 )
+
+py_test(
+    name = "text_classifier_test",
+    srcs = ["text_classifier_test.py"],
+    data = [
+        "//mediapipe/tasks/testdata/metadata:data_files",
+        "//mediapipe/tasks/testdata/metadata:model_files",
+    ],
+    deps = [
+        "//mediapipe/tasks/python/metadata/metadata_writers:metadata_writer",
+        "//mediapipe/tasks/python/metadata/metadata_writers:text_classifier",
+        "//mediapipe/tasks/python/test:test_utils",
+    ],
+)

mediapipe/tasks/python/test/metadata/metadata_writers/metadata_info_test.py

@@ -191,6 +191,43 @@ class InputImageTensorMdTest(parameterized.TestCase):
         f"{len(norm_mean)} and {len(norm_std)}", str(error.exception))
 
 
+class InputTextTensorMdTest(absltest.TestCase):
+
+  _NAME = "input text"
+  _DESCRIPTION = "The input string."
+  _VOCAB_FILE = "vocab.txt"
+  _DELIM_REGEX_PATTERN = r"[^\w\']+"
+  _EXPECTED_TENSOR_JSON = test_utils.get_test_data_path(
+      os.path.join(_TEST_DATA_DIR, "input_text_tensor_meta.json"))
+  _EXPECTED_TENSOR_DEFAULT_JSON = test_utils.get_test_data_path(
+      os.path.join(_TEST_DATA_DIR, "input_text_tensor_default_meta.json"))
+
+  def test_create_metadata_should_succeed(self):
+    regex_tokenizer_md = metadata_info.RegexTokenizerMd(
+        self._DELIM_REGEX_PATTERN, self._VOCAB_FILE)
+
+    text_tensor_md = metadata_info.InputTextTensorMd(self._NAME,
+                                                     self._DESCRIPTION,
+                                                     regex_tokenizer_md)
+
+    metadata_json = _metadata.convert_to_json(
+        _create_dummy_model_metadata_with_tensor(
+            text_tensor_md.create_metadata()))
+    with open(self._EXPECTED_TENSOR_JSON, "r") as f:
+      expected_json = f.read()
+    self.assertEqual(metadata_json, expected_json)
+
+  def test_create_metadata_by_default_should_succeed(self):
+    text_tensor_md = metadata_info.InputTextTensorMd()
+
+    metadata_json = _metadata.convert_to_json(
+        _create_dummy_model_metadata_with_tensor(
+            text_tensor_md.create_metadata()))
+    with open(self._EXPECTED_TENSOR_DEFAULT_JSON, "r") as f:
+      expected_json = f.read()
+    self.assertEqual(metadata_json, expected_json)
+
+
 class ClassificationTensorMdTest(parameterized.TestCase):
 
   _NAME = "probability"

mediapipe/tasks/python/test/metadata/metadata_writers/metadata_writer_test.py

@@ -113,7 +113,7 @@ class MetadataWriterForTaskTest(absltest.TestCase):
   def test_initialize_and_populate(self):
     writer = metadata_writer.MetadataWriter.create(
         self.image_classifier_model_buffer)
-    writer.add_genernal_info(
+    writer.add_general_info(
         model_name='my_image_model', model_description='my_description')
     tflite_model, metadata_json = writer.populate()
     self.assertLen(tflite_model, 1882986)
@@ -142,7 +142,7 @@ class MetadataWriterForTaskTest(absltest.TestCase):
   def test_add_feature_input_output(self):
     writer = metadata_writer.MetadataWriter.create(
         self.image_classifier_model_buffer)
-    writer.add_genernal_info(
+    writer.add_general_info(
         model_name='my_model', model_description='my_description')
     writer.add_feature_input(
         name='input_tesnor', description='a feature input tensor')
@@ -191,7 +191,7 @@ class MetadataWriterForTaskTest(absltest.TestCase):
   def test_image_classifier(self):
     writer = metadata_writer.MetadataWriter.create(
         self.image_classifier_model_buffer)
-    writer.add_genernal_info(
+    writer.add_general_info(
         model_name='image_classifier',
         model_description='Imagenet classification model')
     writer.add_image_input(
@@ -282,7 +282,7 @@ class MetadataWriterForTaskTest(absltest.TestCase):
 
   def test_image_classifier_with_locale_and_score_calibration(self):
     writer = metadata_writer.MetadataWriter(self.image_classifier_model_buffer)
-    writer.add_genernal_info(
+    writer.add_general_info(
         model_name='image_classifier',
         model_description='Classify the input image.')
     writer.add_image_input(

mediapipe/tasks/python/test/metadata/metadata_writers/text_classifier_test.py

@@ -0,0 +1,51 @@
+# Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+"""Tests for metadata_writer.text_classifier."""
+
+from absl.testing import absltest
+
+from mediapipe.tasks.python.metadata.metadata_writers import metadata_writer
+from mediapipe.tasks.python.metadata.metadata_writers import text_classifier
+from mediapipe.tasks.python.test import test_utils
+
+_TEST_DIR = "mediapipe/tasks/testdata/metadata/"
+_MODEL = test_utils.get_test_data_path(_TEST_DIR + "movie_review.tflite")
+_LABEL_FILE = test_utils.get_test_data_path(_TEST_DIR +
+                                            "movie_review_labels.txt")
+_VOCAB_FILE = test_utils.get_test_data_path(_TEST_DIR + "regex_vocab.txt")
+_DELIM_REGEX_PATTERN = r"[^\w\']+"
+_JSON_FILE = test_utils.get_test_data_path("movie_review.json")
+
+
+class TextClassifierTest(absltest.TestCase):
+
+  def test_write_metadata(self,):
+    with open(_MODEL, "rb") as f:
+      model_buffer = f.read()
+    writer = text_classifier.MetadataWriter.create_for_regex_model(
+        model_buffer,
+        regex_tokenizer=metadata_writer.RegexTokenizer(
+            delim_regex_pattern=_DELIM_REGEX_PATTERN,
+            vocab_file_path=_VOCAB_FILE),
+        labels=metadata_writer.Labels().add_from_file(_LABEL_FILE))
+    _, metadata_json = writer.populate()
+
+    with open(_JSON_FILE, "r") as f:
+      expected_json = f.read()
+    self.assertEqual(metadata_json, expected_json)
+
+
+if __name__ == "__main__":
+  absltest.main()

mediapipe/tasks/python/test/text/text_classifier_test.py

@@ -154,12 +154,10 @@ class ImageClassifierTest(parameterized.TestCase):
       self.assertIsInstance(classifier, _TextClassifier)
 
   def test_create_from_options_fails_with_invalid_model_path(self):
-    # Invalid empty model path.
     with self.assertRaisesRegex(
-        ValueError,
+        RuntimeError, 'Unable to open file at /path/to/invalid/model.tflite'):
-        r"ExternalFile must specify at least one of 'file_content', "
+      base_options = _BaseOptions(
-        r"'file_name', 'file_pointer_meta' or 'file_descriptor_meta'."):
+          model_asset_path='/path/to/invalid/model.tflite')
-      base_options = _BaseOptions(model_asset_path='')
       options = _TextClassifierOptions(base_options=base_options)
       _TextClassifier.create_from_options(options)
 

mediapipe/tasks/python/test/vision/image_classifier_test.py

@@ -147,12 +147,10 @@ class ImageClassifierTest(parameterized.TestCase):
       self.assertIsInstance(classifier, _ImageClassifier)
 
   def test_create_from_options_fails_with_invalid_model_path(self):
-    # Invalid empty model path.
     with self.assertRaisesRegex(
-        ValueError,
+        RuntimeError, 'Unable to open file at /path/to/invalid/model.tflite'):
-        r"ExternalFile must specify at least one of 'file_content', "
+      base_options = _BaseOptions(
-        r"'file_name', 'file_pointer_meta' or 'file_descriptor_meta'."):
+          model_asset_path='/path/to/invalid/model.tflite')
-      base_options = _BaseOptions(model_asset_path='')
       options = _ImageClassifierOptions(base_options=base_options)
       _ImageClassifier.create_from_options(options)
 

mediapipe/tasks/python/test/vision/image_segmenter_test.py

@@ -97,12 +97,10 @@ class ImageSegmenterTest(parameterized.TestCase):
       self.assertIsInstance(segmenter, _ImageSegmenter)
 
   def test_create_from_options_fails_with_invalid_model_path(self):
-    # Invalid empty model path.
     with self.assertRaisesRegex(
-        ValueError,
+        RuntimeError, 'Unable to open file at /path/to/invalid/model.tflite'):
-        r"ExternalFile must specify at least one of 'file_content', "
+      base_options = _BaseOptions(
-        r"'file_name', 'file_pointer_meta' or 'file_descriptor_meta'."):
+          model_asset_path='/path/to/invalid/model.tflite')
-      base_options = _BaseOptions(model_asset_path='')
       options = _ImageSegmenterOptions(base_options=base_options)
       _ImageSegmenter.create_from_options(options)
 

mediapipe/tasks/python/test/vision/object_detector_test.py

@@ -119,12 +119,10 @@ class ObjectDetectorTest(parameterized.TestCase):
       self.assertIsInstance(detector, _ObjectDetector)
 
   def test_create_from_options_fails_with_invalid_model_path(self):
-    # Invalid empty model path.
     with self.assertRaisesRegex(
-        ValueError,
+        RuntimeError, 'Unable to open file at /path/to/invalid/model.tflite'):
-        r"ExternalFile must specify at least one of 'file_content', "
+      base_options = _BaseOptions(
-        r"'file_name', 'file_pointer_meta' or 'file_descriptor_meta'."):
+          model_asset_path='/path/to/invalid/model.tflite')
-      base_options = _BaseOptions(model_asset_path='')
       options = _ObjectDetectorOptions(base_options=base_options)
       _ObjectDetector.create_from_options(options)
 

mediapipe/tasks/python/vision/BUILD

@@ -70,7 +70,7 @@ py_library(
         "//mediapipe/python:packet_creator",
         "//mediapipe/python:packet_getter",
         "//mediapipe/tasks/cc/components/proto:segmenter_options_py_pb2",
-        "//mediapipe/tasks/cc/vision/image_segmenter/proto:image_segmenter_options_py_pb2",
+        "//mediapipe/tasks/cc/vision/image_segmenter/proto:image_segmenter_graph_options_py_pb2",
         "//mediapipe/tasks/python/core:base_options",
         "//mediapipe/tasks/python/core:optional_dependencies",
         "//mediapipe/tasks/python/core:task_info",

mediapipe/tasks/python/vision/image_segmenter.py

@@ -22,7 +22,7 @@ from mediapipe.python import packet_getter
 from mediapipe.python._framework_bindings import image as image_module
 from mediapipe.python._framework_bindings import packet
 from mediapipe.tasks.cc.components.proto import segmenter_options_pb2
-from mediapipe.tasks.cc.vision.image_segmenter.proto import image_segmenter_options_pb2
+from mediapipe.tasks.cc.vision.image_segmenter.proto import image_segmenter_graph_options_pb2
 from mediapipe.tasks.python.core import base_options as base_options_module
 from mediapipe.tasks.python.core import task_info as task_info_module
 from mediapipe.tasks.python.core.optional_dependencies import doc_controls
@@ -31,7 +31,7 @@ from mediapipe.tasks.python.vision.core import vision_task_running_mode
 
 _BaseOptions = base_options_module.BaseOptions
 _SegmenterOptionsProto = segmenter_options_pb2.SegmenterOptions
-_ImageSegmenterOptionsProto = image_segmenter_options_pb2.ImageSegmenterOptions
+_ImageSegmenterGraphOptionsProto = image_segmenter_graph_options_pb2.ImageSegmenterGraphOptions
 _RunningMode = vision_task_running_mode.VisionTaskRunningMode
 _TaskInfo = task_info_module.TaskInfo
 
@@ -40,7 +40,7 @@ _SEGMENTATION_TAG = 'GROUPED_SEGMENTATION'
 _IMAGE_IN_STREAM_NAME = 'image_in'
 _IMAGE_OUT_STREAM_NAME = 'image_out'
 _IMAGE_TAG = 'IMAGE'
-_TASK_GRAPH_NAME = 'mediapipe.tasks.vision.ImageSegmenterGraph'
+_TASK_GRAPH_NAME = 'mediapipe.tasks.vision.image_segmenter.ImageSegmenterGraph'
 _MICRO_SECONDS_PER_MILLISECOND = 1000
 
 
@@ -81,13 +81,13 @@ class ImageSegmenterOptions:
       [List[image_module.Image], image_module.Image, int], None]] = None
 
   @doc_controls.do_not_generate_docs
-  def to_pb2(self) -> _ImageSegmenterOptionsProto:
+  def to_pb2(self) -> _ImageSegmenterGraphOptionsProto:
     """Generates an ImageSegmenterOptions protobuf object."""
     base_options_proto = self.base_options.to_pb2()
     base_options_proto.use_stream_mode = False if self.running_mode == _RunningMode.IMAGE else True
     segmenter_options_proto = _SegmenterOptionsProto(
         output_type=self.output_type.value, activation=self.activation.value)
-    return _ImageSegmenterOptionsProto(
+    return _ImageSegmenterGraphOptionsProto(
         base_options=base_options_proto,
         segmenter_options=segmenter_options_proto)
 

mediapipe/tasks/testdata/metadata/BUILD

@@ -31,6 +31,7 @@ mediapipe_files(srcs = [
     "mobilenet_v2_1.0_224_quant.tflite",
     "mobilenet_v2_1.0_224_quant_without_metadata.tflite",
     "mobilenet_v2_1.0_224_without_metadata.tflite",
+    "movie_review.tflite",
 ])
 
 exports_files([
@@ -54,6 +55,11 @@ exports_files([
     "labels.txt",
     "mobilenet_v2_1.0_224.json",
     "mobilenet_v2_1.0_224_quant.json",
+    "input_text_tensor_meta.json",
+    "input_text_tensor_default_meta.json",
+    "movie_review_labels.txt",
+    "regex_vocab.txt",
+    "movie_review.json",
 ])
 
 filegroup(
@@ -67,6 +73,7 @@ filegroup(
         "mobilenet_v2_1.0_224_quant.tflite",
         "mobilenet_v2_1.0_224_quant_without_metadata.tflite",
         "mobilenet_v2_1.0_224_without_metadata.tflite",
+        "movie_review.tflite",
     ],
 )
 
@@ -86,9 +93,14 @@ filegroup(
         "input_image_tensor_float_meta.json",
         "input_image_tensor_uint8_meta.json",
         "input_image_tensor_unsupported_meta.json",
+        "input_text_tensor_default_meta.json",
+        "input_text_tensor_meta.json",
         "labels.txt",
         "mobilenet_v2_1.0_224.json",
         "mobilenet_v2_1.0_224_quant.json",
+        "movie_review.json",
+        "movie_review_labels.txt",
+        "regex_vocab.txt",
         "score_calibration.txt",
         "score_calibration_file_meta.json",
         "score_calibration_tensor_meta.json",

mediapipe/tasks/testdata/metadata/input_text_tensor_default_meta.json

@@ -0,0 +1,17 @@
+{
+  "subgraph_metadata": [
+    {
+      "input_tensor_metadata": [
+        {
+          "content": {
+            "content_properties_type": "FeatureProperties",
+            "content_properties": {
+            }
+          },
+          "stats": {
+          }
+        }
+      ]
+    }
+  ]
+}

mediapipe/tasks/testdata/metadata/input_text_tensor_meta.json

@@ -0,0 +1,34 @@
+{
+  "subgraph_metadata": [
+    {
+      "input_tensor_metadata": [
+        {
+          "name": "input text",
+          "description": "The input string.",
+          "content": {
+            "content_properties_type": "FeatureProperties",
+            "content_properties": {
+            }
+          },
+          "process_units": [
+            {
+              "options_type": "RegexTokenizerOptions",
+              "options": {
+                "delim_regex_pattern": "[^\\w\\']+",
+                "vocab_file": [
+                  {
+                    "name": "vocab.txt",
+                    "description": "Vocabulary file to convert natural language words to embedding vectors.",
+                    "type": "VOCABULARY"
+                  }
+                ]
+              }
+            }
+          ],
+          "stats": {
+          }
+        }
+      ]
+    }
+  ]
+}

mediapipe/tasks/testdata/metadata/movie_review.json

@@ -0,0 +1,63 @@
+{
+  "name": "TextClassifier",
+  "description": "Classify the input text into a set of known categories.",
+  "subgraph_metadata": [
+    {
+      "input_tensor_metadata": [
+        {
+          "name": "input_text",
+          "description": "Embedding vectors representing the input text to be processed.",
+          "content": {
+            "content_properties_type": "FeatureProperties",
+            "content_properties": {
+            }
+          },
+          "process_units": [
+            {
+              "options_type": "RegexTokenizerOptions",
+              "options": {
+                "delim_regex_pattern": "[^\\w\\']+",
+                "vocab_file": [
+                  {
+                    "name": "regex_vocab.txt",
+                    "description": "Vocabulary file to convert natural language words to embedding vectors.",
+                    "type": "VOCABULARY"
+                  }
+                ]
+              }
+            }
+          ],
+          "stats": {
+          }
+        }
+      ],
+      "output_tensor_metadata": [
+        {
+          "name": "score",
+          "description": "Score of the labels respectively.",
+          "content": {
+            "content_properties_type": "FeatureProperties",
+            "content_properties": {
+            }
+          },
+          "stats": {
+            "max": [
+              1.0
+            ],
+            "min": [
+              0.0
+            ]
+          },
+          "associated_files": [
+            {
+              "name": "labels.txt",
+              "description": "Labels for categories that the model can recognize.",
+              "type": "TENSOR_AXIS_LABELS"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "min_parser_version": "1.2.1"
+}

mediapipe/tasks/testdata/metadata/movie_review_labels.txt

@@ -0,0 +1,2 @@
+Negative
+Positive

mediapipe/tasks/testdata/text/BUILD

@@ -28,6 +28,7 @@ mediapipe_files(srcs = [
     "bert_text_classifier.tflite",
     "mobilebert_embedding_with_metadata.tflite",
     "mobilebert_with_metadata.tflite",
+    "regex_one_embedding_with_metadata.tflite",
     "test_model_text_classifier_bool_output.tflite",
     "test_model_text_classifier_with_regex_tokenizer.tflite",
     "universal_sentence_encoder_qa_with_metadata.tflite",
@@ -92,6 +93,11 @@ filegroup(
     srcs = ["mobilebert_embedding_with_metadata.tflite"],
 )
 
+filegroup(
+    name = "regex_embedding_with_metadata",
+    srcs = ["regex_one_embedding_with_metadata.tflite"],
+)
+
 filegroup(
     name = "universal_sentence_encoder_qa",
     data = ["universal_sentence_encoder_qa_with_metadata.tflite"],

mediapipe/tasks/testdata/vision/BUILD

@@ -144,8 +144,13 @@ filegroup(
 )
 
 # Gestures related models. Visible to model_maker.
+# TODO: Upload canned gesture model and gesture embedding model to GCS after Model Card approval
 filegroup(
     name = "test_gesture_models",
+    srcs = [
+        "hand_landmark_full.tflite",
+        "palm_detection_full.tflite",
+    ],
     visibility = [
         "//mediapipe/model_maker:__subpackages__",
         "//mediapipe/tasks:internal",

mediapipe/tasks/web/BUILD

@@ -0,0 +1,106 @@
+# This contains the MediaPipe Tasks NPM package definitions.
+
+load("//mediapipe/framework/port:build_config.bzl", "mediapipe_ts_library")
+load("@build_bazel_rules_nodejs//:index.bzl", "pkg_npm")
+load("@npm//@bazel/rollup:index.bzl", "rollup_bundle")
+
+package(default_visibility = ["//mediapipe/tasks:internal"])
+
+# Audio
+
+mediapipe_ts_library(
+    name = "audio_lib",
+    srcs = ["audio.ts"],
+    deps = ["//mediapipe/tasks/web/audio:audio_lib"],
+)
+
+rollup_bundle(
+    name = "audio_bundle",
+    config_file = "rollup.config.mjs",
+    entry_point = "audio.ts",
+    output_dir = False,
+    deps = [
+        ":audio_lib",
+        "@npm//@rollup/plugin-commonjs",
+        "@npm//@rollup/plugin-node-resolve",
+    ],
+)
+
+pkg_npm(
+    name = "audio_pkg",
+    package_name = "__PACKAGE_NAME__",
+    srcs = ["package.json"],
+    substitutions = {
+        "__PACKAGE_NAME__": "@mediapipe/tasks-audio",
+        "__DESCRIPTION__": "MediaPipe Audio Tasks",
+        "__BUNDLE__": "audio_bundle.js",
+    },
+    tgz = "audio.tgz",
+    deps = [":audio_bundle"],
+)
+
+# Text
+
+mediapipe_ts_library(
+    name = "text_lib",
+    srcs = ["text.ts"],
+    deps = ["//mediapipe/tasks/web/text:text_lib"],
+)
+
+rollup_bundle(
+    name = "text_bundle",
+    config_file = "rollup.config.mjs",
+    entry_point = "text.ts",
+    output_dir = False,
+    deps = [
+        ":text_lib",
+        "@npm//@rollup/plugin-commonjs",
+        "@npm//@rollup/plugin-node-resolve",
+    ],
+)
+
+pkg_npm(
+    name = "text_pkg",
+    package_name = "__PACKAGE_NAME__",
+    srcs = ["package.json"],
+    substitutions = {
+        "__PACKAGE_NAME__": "@mediapipe/tasks-text",
+        "__DESCRIPTION__": "MediaPipe Text Tasks",
+        "__BUNDLE__": "text_bundle.js",
+    },
+    tgz = "text.tgz",
+    deps = [":text_bundle"],
+)
+
+# Vision
+
+mediapipe_ts_library(
+    name = "vision_lib",
+    srcs = ["vision.ts"],
+    deps = ["//mediapipe/tasks/web/vision:vision_lib"],
+)
+
+rollup_bundle(
+    name = "vision_bundle",
+    config_file = "rollup.config.mjs",
+    entry_point = "vision.ts",
+    output_dir = False,
+    deps = [
+        ":vision_lib",
+        "@npm//@rollup/plugin-commonjs",
+        "@npm//@rollup/plugin-node-resolve",
+    ],
+)
+
+pkg_npm(
+    name = "vision_pkg",
+    package_name = "__PACKAGE_NAME__",
+    srcs = ["package.json"],
+    substitutions = {
+        "__PACKAGE_NAME__": "@mediapipe/tasks-vision",
+        "__DESCRIPTION__": "MediaPipe Vision Tasks",
+        "__BUNDLE__": "vision_bundle.js",
+    },
+    tgz = "vision.tgz",
+    deps = [":vision_bundle"],
+)

mediapipe/tasks/web/audio.ts

@@ -0,0 +1,17 @@
+/**
+ * Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export * from '../../tasks/web/audio/index';

mediapipe/tasks/web/audio/BUILD

@@ -2,6 +2,8 @@
 
 load("//mediapipe/framework/port:build_config.bzl", "mediapipe_ts_library")
 
+package(default_visibility = ["//mediapipe/tasks:internal"])
+
 mediapipe_ts_library(
     name = "audio_lib",
     srcs = ["index.ts"],

mediapipe/tasks/web/audio/audio_classifier/audio_classifier.ts

@@ -119,8 +119,8 @@ export class AudioClassifier extends TaskRunner {
    */
   async setOptions(options: AudioClassifierOptions): Promise<void> {
     if (options.baseOptions) {
-      const baseOptionsProto =
+      const baseOptionsProto = await convertBaseOptionsToProto(
-          await convertBaseOptionsToProto(options.baseOptions);
+          options.baseOptions, this.options.getBaseOptions());
       this.options.setBaseOptions(baseOptionsProto);
     }
 
@@ -198,7 +198,7 @@ export class AudioClassifier extends TaskRunner {
     classifierNode.addInputStream('AUDIO:' + AUDIO_STREAM);
     classifierNode.addInputStream('SAMPLE_RATE:' + SAMPLE_RATE_STREAM);
     classifierNode.addOutputStream(
-        'CLASSIFICATION_RESULT:' + CLASSIFICATION_RESULT_STREAM);
+        'CLASSIFICATIONS:' + CLASSIFICATION_RESULT_STREAM);
     classifierNode.setOptions(calculatorOptions);
 
     graphConfig.addNode(classifierNode);

mediapipe/tasks/web/components/processors/BUILD

@@ -26,6 +26,8 @@ mediapipe_ts_library(
     name = "base_options",
     srcs = ["base_options.ts"],
     deps = [
+        "//mediapipe/calculators/tensor:inference_calculator_jspb_proto",
+        "//mediapipe/tasks/cc/core/proto:acceleration_jspb_proto",
         "//mediapipe/tasks/cc/core/proto:base_options_jspb_proto",
         "//mediapipe/tasks/cc/core/proto:external_file_jspb_proto",
         "//mediapipe/tasks/web/core",

mediapipe/tasks/web/components/processors/base_options.ts

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+import {InferenceCalculatorOptions} from '../../../../calculators/tensor/inference_calculator_pb';
+import {Acceleration} from '../../../../tasks/cc/core/proto/acceleration_pb';
 import {BaseOptions as BaseOptionsProto} from '../../../../tasks/cc/core/proto/base_options_pb';
 import {ExternalFile} from '../../../../tasks/cc/core/proto/external_file_pb';
 import {BaseOptions} from '../../../../tasks/web/core/base_options';
@@ -25,26 +27,60 @@ import {BaseOptions} from '../../../../tasks/web/core/base_options';
  * Converts a BaseOptions API object to its Protobuf representation.
  * @throws If neither a model assset path or buffer is provided
  */
-export async function convertBaseOptionsToProto(baseOptions: BaseOptions):
+export async function convertBaseOptionsToProto(
-    Promise<BaseOptionsProto> {
+    updatedOptions: BaseOptions,
-  if (baseOptions.modelAssetPath && baseOptions.modelAssetBuffer) {
+    currentOptions?: BaseOptionsProto): Promise<BaseOptionsProto> {
+  const result =
+      currentOptions ? currentOptions.clone() : new BaseOptionsProto();
+
+  await configureExternalFile(updatedOptions, result);
+  configureAcceleration(updatedOptions, result);
+
+  return result;
+}
+
+/**
+ * Configues the `externalFile` option and validates that a single model is
+ * provided.
+ */
+async function configureExternalFile(
+    options: BaseOptions, proto: BaseOptionsProto) {
+  const externalFile = proto.getModelAsset() || new ExternalFile();
+  proto.setModelAsset(externalFile);
+
+  if (options.modelAssetPath || options.modelAssetBuffer) {
+    if (options.modelAssetPath && options.modelAssetBuffer) {
       throw new Error(
           'Cannot set both baseOptions.modelAssetPath and baseOptions.modelAssetBuffer');
     }
-  if (!baseOptions.modelAssetPath && !baseOptions.modelAssetBuffer) {
+
+    let modelAssetBuffer = options.modelAssetBuffer;
+    if (!modelAssetBuffer) {
+      const response = await fetch(options.modelAssetPath!.toString());
+      modelAssetBuffer = new Uint8Array(await response.arrayBuffer());
+    }
+    externalFile.setFileContent(modelAssetBuffer);
+  }
+
+  if (!externalFile.hasFileContent()) {
     throw new Error(
         'Either baseOptions.modelAssetPath or baseOptions.modelAssetBuffer must be set');
   }
-
+}
-  let modelAssetBuffer = baseOptions.modelAssetBuffer;
+
-  if (!modelAssetBuffer) {
+/** Configues the `acceleration` option. */
-    const response = await fetch(baseOptions.modelAssetPath!.toString());
+function configureAcceleration(options: BaseOptions, proto: BaseOptionsProto) {
-    modelAssetBuffer = new Uint8Array(await response.arrayBuffer());
+  if ('delegate' in options) {
-  }
+    const acceleration = new Acceleration();
-
+    if (options.delegate === 'cpu') {
-  const proto = new BaseOptionsProto();
+      acceleration.setXnnpack(
-  const externalFile = new ExternalFile();
+          new InferenceCalculatorOptions.Delegate.Xnnpack());
-  externalFile.setFileContent(modelAssetBuffer);
+      proto.setAcceleration(acceleration);
-  proto.setModelAsset(externalFile);
+    } else if (options.delegate === 'gpu') {
-  return proto;
+      acceleration.setGpu(new InferenceCalculatorOptions.Delegate.Gpu());
+      proto.setAcceleration(acceleration);
+    } else {
+      proto.clearAcceleration();
+    }
+  }
 }

mediapipe/tasks/web/core/base_options.d.ts

@@ -22,10 +22,14 @@ export interface BaseOptions {
    * The model path to the model asset file. Only one of `modelAssetPath` or
    * `modelAssetBuffer` can be set.
    */
-  modelAssetPath?: string;
+  modelAssetPath?: string|undefined;
+
   /**
    * A buffer containing the model aaset. Only one of `modelAssetPath` or
    * `modelAssetBuffer` can be set.
    */
-  modelAssetBuffer?: Uint8Array;
+  modelAssetBuffer?: Uint8Array|undefined;
+
+  /** Overrides the default backend to use for the provided model. */
+  delegate?: 'cpu'|'gpu'|undefined;
 }

mediapipe/tasks/web/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "__PACKAGE_NAME__",
+  "version": "__VERSION__",
+  "description": "__DESCRIPTION__",
+  "main": "__BUNDLE__",
+  "module": "__BUNDLE__",
+  "author": "mediapipe@google.com",
+  "license": "Apache-2.0",
+  "type": "module",
+  "dependencies": {
+    "google-protobuf": "^3.21.2"
+  },
+  "homepage": "http://mediapipe.dev",
+  "keywords": [ "AR", "ML", "Augmented", "MediaPipe", "MediaPipe Tasks" ]
+}