Allow Web developers to opt into CPU or GPU processing

PiperOrigin-RevId: 486935157

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);
     }
 

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) {
-    const response = await fetch(baseOptions.modelAssetPath!.toString());
-    modelAssetBuffer = new Uint8Array(await response.arrayBuffer());
 }
 
-  const proto = new BaseOptionsProto();
+/** Configues the `acceleration` option. */
-  const externalFile = new ExternalFile();
+function configureAcceleration(options: BaseOptions, proto: BaseOptionsProto) {
-  externalFile.setFileContent(modelAssetBuffer);
+  if ('delegate' in options) {
-  proto.setModelAsset(externalFile);
+    const acceleration = new Acceleration();
-  return proto;
+    if (options.delegate === 'cpu') {
+      acceleration.setXnnpack(
+          new InferenceCalculatorOptions.Delegate.Xnnpack());
+      proto.setAcceleration(acceleration);
+    } else if (options.delegate === 'gpu') {
+      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/text/text_classifier/text_classifier.ts

@@ -111,8 +111,8 @@ export class TextClassifier extends TaskRunner {
    */
   async setOptions(options: TextClassifierOptions): Promise<void> {
     if (options.baseOptions) {
-      const baseOptionsProto =
+      const baseOptionsProto = await convertBaseOptionsToProto(
-          await convertBaseOptionsToProto(options.baseOptions);
+          options.baseOptions, this.options.getBaseOptions());
       this.options.setBaseOptions(baseOptionsProto);
     }
 

mediapipe/tasks/web/vision/gesture_recognizer/gesture_recognizer.ts

@@ -171,8 +171,8 @@ export class GestureRecognizer extends TaskRunner {
    */
   async setOptions(options: GestureRecognizerOptions): Promise<void> {
     if (options.baseOptions) {
-      const baseOptionsProto =
+      const baseOptionsProto = await convertBaseOptionsToProto(
-          await convertBaseOptionsToProto(options.baseOptions);
+          options.baseOptions, this.options.getBaseOptions());
       this.options.setBaseOptions(baseOptionsProto);
     }
 

mediapipe/tasks/web/vision/image_classifier/image_classifier.ts

@@ -114,8 +114,8 @@ export class ImageClassifier extends TaskRunner {
    */
   async setOptions(options: ImageClassifierOptions): Promise<void> {
     if (options.baseOptions) {
-      const baseOptionsProto =
+      const baseOptionsProto = await convertBaseOptionsToProto(
-          await convertBaseOptionsToProto(options.baseOptions);
+          options.baseOptions, this.options.getBaseOptions());
       this.options.setBaseOptions(baseOptionsProto);
     }
 

mediapipe/tasks/web/vision/object_detector/object_detector.ts

@@ -112,8 +112,8 @@ export class ObjectDetector extends TaskRunner {
    */
   async setOptions(options: ObjectDetectorOptions): Promise<void> {
     if (options.baseOptions) {
-      const baseOptionsProto =
+      const baseOptionsProto = await convertBaseOptionsToProto(
-          await convertBaseOptionsToProto(options.baseOptions);
+          options.baseOptions, this.options.getBaseOptions());
       this.options.setBaseOptions(baseOptionsProto);
     }