@tensorflow/tfjs-backend-wasm
Version:
This package adds a WebAssembly backend to TensorFlow.js. It currently supports the following models from our [models](https://github.com/tensorflow/tfjs-models) repo: - BlazeFace - BodyPix - CocoSSD - Face landmarks detection - HandPose - KNN classifier
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JavaScript
/**
* @license
* Copyright 2021 Google LLC. 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 { backend_util } from '@tensorflow/tfjs-core';
import { CppDType } from './types';
let wasmSparseSegmentReduction;
export function setup(backend) {
wasmSparseSegmentReduction =
backend.wasm.cwrap('SparseSegmentReduction', null /*void*/, [
'number',
'number',
'number',
'number',
'number',
'number',
'number',
'number',
'number', // defaultValue
]);
}
export function sparseSegmentReduction(args, isMean) {
const { backend, inputs } = args;
const { data, indices, segmentIds } = inputs;
const numIndices = indices.shape[0];
const segmentIdsBack = backend.readSync(segmentIds.dataId, numIndices - 1, numIndices)[0];
const lastSegmentIdPlusOne = numIndices > 0 ? segmentIdsBack + 1 : 0;
const outputRows = lastSegmentIdPlusOne;
if (outputRows < 0) {
throw (new Error(backend_util
.getSparseSegmentReductionNegativeSegmentIdsErrorMessage()));
}
const outputShape = data.shape.slice();
outputShape[0] = outputRows;
const dataId = backend.dataIdMap.get(data.dataId).id;
const indicesId = backend.dataIdMap.get(indices.dataId).id;
const segmentIdsId = backend.dataIdMap.get(segmentIds.dataId).id;
const output = backend.makeOutput(outputShape, data.dtype);
const outputId = backend.dataIdMap.get(output.dataId).id;
const exceptionValues = backend.makeOutput([4], 'int32');
const exceptionValuesId = backend.dataIdMap.get(exceptionValues.dataId).id;
wasmSparseSegmentReduction(dataId, CppDType[data.dtype], data.shape[0], indicesId, segmentIdsId, outputId, exceptionValuesId, isMean, 0);
const exceptionValuesArray = backend.readSync(exceptionValues.dataId);
let exceptionMessage;
switch (exceptionValuesArray[0]) {
case 0: {
exceptionMessage =
backend_util
.getSparseSegmentReductionNegativeSegmentIdsErrorMessage();
break;
}
case 1: {
exceptionMessage =
backend_util
.getSparseSegmentReductionNonIncreasingSegmentIdsErrorMessage();
break;
}
case 2:
exceptionMessage =
backend_util.getSparseSegmentReductionSegmentIdOutOfRangeErrorMessage(exceptionValuesArray[1], exceptionValuesArray[2]);
break;
case 3:
exceptionMessage =
backend_util.getSparseSegmentReductionIndicesOutOfRangeErrorMessage(exceptionValuesArray[1], exceptionValuesArray[2], exceptionValuesArray[3]);
break;
default:
exceptionMessage = '';
}
backend.disposeData(exceptionValues.dataId);
if (exceptionMessage) {
backend.disposeData(output.dataId);
throw new Error(exceptionMessage);
}
return output;
}
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All Rights Reserved.\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n * =============================================================================\n */\n\nimport {backend_util, SparseSegmentMeanInputs, SparseSegmentSumInputs, TensorInfo} from '@tensorflow/tfjs-core';\n\nimport {BackendWasm} from '../backend_wasm';\n\nimport {CppDType} from './types';\n\nlet wasmSparseSegmentReduction: (\n    dataId: number, dtype: number, numRow: number, indicesId: number,\n    segmentIdsId: number, outputId: number, exceptionValuesId: number,\n    isMean: boolean, defaultValue: number) => void;\n\nexport function setup(backend: BackendWasm): void {\n  wasmSparseSegmentReduction =\n      backend.wasm.cwrap('SparseSegmentReduction', null /*void*/, [\n        'number',  // dataId\n        'number',  // dtype\n        'number',  // numRow\n        'number',  // indicesId\n        'number',  // segmentIdsId\n        'number',  // outputId\n        'number',  // exceptionValuesId,\n        'number',  // isMean\n        'number',  // defaultValue\n      ]);\n}\n\nexport function sparseSegmentReduction(\n    args: {\n      backend: BackendWasm,\n      inputs: SparseSegmentSumInputs|SparseSegmentMeanInputs,\n    },\n    isMean: boolean): TensorInfo {\n  const {backend, inputs} = args;\n  const {data, indices, segmentIds} = inputs;\n\n  const numIndices = indices.shape[0];\n  const segmentIdsBack =\n      (backend.readSync(segmentIds.dataId, numIndices - 1, numIndices) as\n       Int32Array)[0];\n  const lastSegmentIdPlusOne = numIndices > 0 ? segmentIdsBack + 1 : 0;\n  const outputRows = lastSegmentIdPlusOne;\n\n  if (outputRows < 0) {\n    throw (new Error(\n        backend_util\n            .getSparseSegmentReductionNegativeSegmentIdsErrorMessage()));\n  }\n\n  const outputShape = data.shape.slice();\n  outputShape[0] = outputRows;\n\n  const dataId = backend.dataIdMap.get(data.dataId).id;\n  const indicesId = backend.dataIdMap.get(indices.dataId).id;\n  const segmentIdsId = backend.dataIdMap.get(segmentIds.dataId).id;\n\n  const output = backend.makeOutput(outputShape, data.dtype);\n  const outputId = backend.dataIdMap.get(output.dataId).id;\n\n  const exceptionValues = backend.makeOutput([4], 'int32');\n  const exceptionValuesId = backend.dataIdMap.get(exceptionValues.dataId).id;\n\n  wasmSparseSegmentReduction(\n      dataId, CppDType[data.dtype], data.shape[0], indicesId, segmentIdsId,\n      outputId, exceptionValuesId, isMean, 0);\n\n  const exceptionValuesArray =\n      backend.readSync(exceptionValues.dataId) as Int32Array;\n\n  let exceptionMessage: string;\n  switch (exceptionValuesArray[0]) {\n    case 0: {\n      exceptionMessage =\n          backend_util\n              .getSparseSegmentReductionNegativeSegmentIdsErrorMessage();\n      break;\n    }\n    case 1: {\n      exceptionMessage =\n          backend_util\n              .getSparseSegmentReductionNonIncreasingSegmentIdsErrorMessage();\n      break;\n    }\n    case 2:\n      exceptionMessage =\n          backend_util.getSparseSegmentReductionSegmentIdOutOfRangeErrorMessage(\n              exceptionValuesArray[1], exceptionValuesArray[2]);\n      break;\n    case 3:\n      exceptionMessage =\n          backend_util.getSparseSegmentReductionIndicesOutOfRangeErrorMessage(\n              exceptionValuesArray[1], exceptionValuesArray[2],\n              exceptionValuesArray[3]);\n      break;\n    default:\n      exceptionMessage = '';\n  }\n\n  backend.disposeData(exceptionValues.dataId);\n  if (exceptionMessage) {\n    backend.disposeData(output.dataId);\n    throw new Error(exceptionMessage);\n  }\n\n  return output;\n}\n"]}