Add conversion in library

Author: pweglik

packages/react-native-executorch/src/modules/computer_vision/ImageEmbeddingsModule.ts

@@ -1,5 +1,5 @@
 import { ResourceFetcher } from '../../utils/ResourceFetcher';
-import { ResourceSource } from '../../types/common';
+import { getArrayConstructor, ResourceSource } from '../../types/common';
 import { TensorPtr } from '../../types/common';
 import { ETError, getError } from '../../Error';
 import { BaseNonStaticModule } from '../BaseNonStaticModule';
@@ -16,9 +16,13 @@ export class ImageEmbeddingsModule extends BaseNonStaticModule {
     this.nativeModule = global.loadImageEmbeddings(paths[0] || '');
   }
 
-  async forward(imageSource: string): Promise<TensorPtr> {
+  async forward(imageSource: string): Promise<number[]> {
     if (this.nativeModule == null)
       throw new Error(getError(ETError.ModuleNotLoaded));
-    return await this.nativeModule.generate(imageSource);
+    const tensor: TensorPtr = await this.nativeModule.generate(imageSource);
+
+    const resultArray = getArrayConstructor(tensor.scalarType)(tensor.dataPtr);
+
+    return Array.from(resultArray);
   }
 }

packages/react-native-executorch/src/types/common.ts

@@ -7,6 +7,16 @@ export const getTypeIdentifier = (input: ETInput): number => {
   return -1;
 };
 
+export const getArrayConstructor = (
+  scalarType: ScalarType
+): ((arr: TensorBuffer) => Float32Array) => {
+  if (scalarType === ScalarType.FLOAT)
+    return (arr: TensorBuffer) => new Float32Array(arr as Float32Array);
+  // todo add more types?
+
+  throw Error("We don't handle this type of output array");
+};
+
 export type ResourceSource = string | number | object;
 
 export type ETInput =