Added iOS language detector implementation
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parent
f185bc6635
commit
3a43aff13c
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@ -31,3 +31,28 @@ objc_library(
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"//mediapipe/tasks/ios/core:MPPTaskResult",
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"//mediapipe/tasks/ios/core:MPPTaskResult",
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],
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],
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)
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)
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objc_library(
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name = "MPPLanguageDetector",
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srcs = ["sources/MPPLanguageDetector.mm"],
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hdrs = ["sources/MPPLanguageDetector.h"],
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copts = [
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"-ObjC++",
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"-std=c++17",
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"-x objective-c++",
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],
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module_name = "MPPLanguageDetector",
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deps = [
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":MPPLanguageDetectorOptions",
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":MPPLanguageDetectorResult",
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"//mediapipe/tasks/cc/text/text_classifier:text_classifier_graph",
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"//mediapipe/tasks/ios/common/utils:MPPCommonUtils",
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"//mediapipe/tasks/ios/common/utils:NSStringHelpers",
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"//mediapipe/tasks/ios/core:MPPTaskInfo",
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"//mediapipe/tasks/ios/core:MPPTaskOptions",
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"//mediapipe/tasks/ios/core:MPPTextPacketCreator",
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"//mediapipe/tasks/ios/text/core:MPPTextTaskRunner",
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"//mediapipe/tasks/ios/text/language_detector/utils:MPPLanguageDetectorOptionsHelpers",
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"//mediapipe/tasks/ios/text/language_detector/utils:MPPLanguageDetectorResultHelpers",
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],
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)
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@ -0,0 +1,88 @@
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// Copyright 2023 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#import <Foundation/Foundation.h>
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#import "mediapipe/tasks/ios/core/sources/MPPTaskOptions.h"
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#import "mediapipe/tasks/ios/text/language_detector/sources/MPPLanguageDetectorOptions.h"
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#import "mediapipe/tasks/ios/text/language_detector/sources/MPPLanguageDetectorResult.h"
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NS_ASSUME_NONNULL_BEGIN
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/**
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* @brief Predicts the language of an input text.
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*
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* This API expects a TFLite model with [TFLite Model
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* Metadata](https://www.tensorflow.org/lite/convert/metadata")that contains the mandatory
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* (described below) input tensor, output tensor, and the language codes in an AssociatedFile.
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*
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* Metadata is required for models with int32 input tensors because it contains the input
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* process unit for the model's Tokenizer. No metadata is required for models with string
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* input tensors.
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*
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* Input tensor
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* - One input tensor (`kTfLiteString`) of shape `[1]` containing the input string.
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*
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* Output tensor
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* - One output tensor (`kTfLiteFloat32`) of shape `[1 x N]` where `N` is the number of languages.
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*/
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NS_SWIFT_NAME(LanguageDetector)
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@interface MPPLanguageDetector : NSObject
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/**
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* Creates a new instance of `LanguageDetector` from an absolute path to a TensorFlow Lite
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* model file stored locally on the device and the default `LanguageDetectorOptions`.
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*
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* @param modelPath An absolute path to a TensorFlow Lite model file stored locally on the device.
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* @param error An optional error parameter populated when there is an error in initializing the
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* language detector.
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*
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* @return A new instance of `LanguageDetector` with the given model path. `nil` if there is an
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* error in initializing the language detector.
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*/
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- (nullable instancetype)initWithModelPath:(NSString *)modelPath error:(NSError **)error;
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/**
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* Creates a new instance of `LanguageDetector` from the given `LanguageDetectorOptions`.
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*
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* @param options The options of type `LanguageDetectorOptions` to use for configuring the
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* `LanguageDetector`.
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* @param error An optional error parameter populated when there is an error in initializing the
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* language detector.
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*
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* @return A new instance of `LanguageDetector` with the given options. `nil` if there is an
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* error in initializing the language detector.
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*/
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- (nullable instancetype)initWithOptions:(MPPLanguageDetectorOptions *)options
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error:(NSError **)error NS_DESIGNATED_INITIALIZER;
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/**
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* Predicts the language of the input text.
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*
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* @param text The `NSString` for which language is to be predicted.
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* @param error An optional error parameter populated when there is an error in performing
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* language prediction on the input text.
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*
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* @return A `LanguageDetectorResult` object that contains a list of language predictions.
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*/
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- (nullable MPPLanguageDetectorResult *)detectText:(NSString *)text
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error:(NSError **)error NS_SWIFT_NAME(detect(text:));
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- (instancetype)init NS_UNAVAILABLE;
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+ (instancetype)new NS_UNAVAILABLE;
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@end
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NS_ASSUME_NONNULL_END
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@ -0,0 +1,96 @@
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// Copyright 2023 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#import "mediapipe/tasks/ios/text/language_detector/sources/MPPLanguageDetector.h"
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#import "mediapipe/tasks/ios/common/utils/sources/MPPCommonUtils.h"
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#import "mediapipe/tasks/ios/common/utils/sources/NSString+Helpers.h"
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#import "mediapipe/tasks/ios/core/sources/MPPTaskInfo.h"
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#import "mediapipe/tasks/ios/core/sources/MPPTextPacketCreator.h"
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#import "mediapipe/tasks/ios/text/core/sources/MPPTextTaskRunner.h"
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#import "mediapipe/tasks/ios/text/language_detector/utils/sources/MPPLanguageDetectorOptions+Helpers.h"
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#import "mediapipe/tasks/ios/text/language_detector/utils/sources/MPPLanguageDetectorResult+Helpers.h"
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namespace {
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using ::mediapipe::Packet;
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using ::mediapipe::tasks::core::PacketMap;
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} // namespace
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static NSString *const kClassificationsStreamName = @"classifications_out";
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static NSString *const kClassificationsTag = @"CLASSIFICATIONS";
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static NSString *const kTextInStreamName = @"text_in";
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static NSString *const kTextTag = @"TEXT";
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static NSString *const kTaskGraphName =
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@"mediapipe.tasks.text.language_detector.LanguageDetectorGraph";
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@interface MPPLanguageDetector () {
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/** iOS Text Task Runner */
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MPPTextTaskRunner *_textTaskRunner;
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}
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@end
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@implementation MPPLanguageDetector
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- (instancetype)initWithOptions:(MPPLanguageDetectorOptions *)options error:(NSError **)error {
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self = [super init];
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if (self) {
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MPPTaskInfo *taskInfo = [[MPPTaskInfo alloc]
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initWithTaskGraphName:kTaskGraphName
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inputStreams:@[ [NSString stringWithFormat:@"%@:%@", kTextTag, kTextInStreamName] ]
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outputStreams:@[ [NSString stringWithFormat:@"%@:%@", kClassificationsTag,
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kClassificationsStreamName] ]
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taskOptions:options
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enableFlowLimiting:NO
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error:error];
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if (!taskInfo) {
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return nil;
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}
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_textTaskRunner =
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[[MPPTextTaskRunner alloc] initWithCalculatorGraphConfig:[taskInfo generateGraphConfig]
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error:error];
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if (!_textTaskRunner) {
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return nil;
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}
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}
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return self;
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}
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- (instancetype)initWithModelPath:(NSString *)modelPath error:(NSError **)error {
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MPPLanguageDetectorOptions *options = [[MPPLanguageDetectorOptions alloc] init];
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options.baseOptions.modelAssetPath = modelPath;
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return [self initWithOptions:options error:error];
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}
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- (nullable MPPLanguageDetectorResult *)detectText:(NSString *)text error:(NSError **)error {
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Packet packet = [MPPTextPacketCreator createWithText:text];
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std::map<std::string, Packet> packetMap = {{kTextInStreamName.cppString, packet}};
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std::optional<PacketMap> outputPacketMap = [_textTaskRunner processPacketMap:packetMap
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error:error];
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if (!outputPacketMap.has_value()) {
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return nil;
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}
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return
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[MPPLanguageDetectorResult languageDetectorResultWithClassificationsPacket:
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outputPacketMap.value()[kClassificationsStreamName.cppString]];
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}
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@end
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