@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
113 lines • 17.2 kB
JavaScript
/**
* @license
* Copyright 2019 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 { Slice, slice_util, util } from '@tensorflow/tfjs-core';
import { sliceImplCPU } from '../kernel_utils/shared';
export function slice(args) {
const { inputs: { x }, attrs: { begin, size }, backend } = args;
const [begin_, size_] = slice_util.parseSliceParams(x, begin, size);
const isContinous = slice_util.isSliceContinous(x.shape, begin_, size_);
const xVals = backend.readSync(x.dataId);
const out = backend.makeOutput(size_, x.dtype);
const xStrides = util.computeStrides(x.shape);
const outData = backend.dataIdMap.get(out.dataId);
if (isContinous) {
const flatOffset = slice_util.computeFlatOffset(begin_, xStrides);
if (x.dtype === 'string') {
outData.stringBytes =
xVals
.slice(flatOffset, flatOffset + util.sizeFromShape(size_));
}
else {
const outVals = backend.typedArrayFromHeap(out);
outVals.set(xVals
.subarray(flatOffset, flatOffset + util.sizeFromShape(size_)));
}
return out;
}
if (x.dtype === 'string') {
const res = sliceImplCPU(xVals, begin_, size_, x.shape, x.dtype);
outData.stringBytes = res;
return out;
}
const outVals = backend.typedArrayFromHeap(out);
const rank = x.shape.length;
if (rank === 2) {
slice2d(xVals, xStrides[0], outVals, begin_, size_);
}
else if (rank === 3) {
slice3d(xVals, xStrides[0], xStrides[1], outVals, begin_, size_);
}
else if (rank === 4) {
slice4d(xVals, xStrides[0], xStrides[1], xStrides[2], outVals, begin_, size_);
}
else {
const res = sliceImplCPU(xVals, begin_, size_, x.shape, x.dtype);
outVals.set(res);
}
return out;
}
function slice2d(xVals, xStride, outVals, begin, size) {
let outOffset = 0;
const beginI = begin[0];
const beginJ = begin[1];
const endI = beginI + size[0];
for (let i = beginI; i < endI; i++) {
const xOffset = i * xStride + beginJ;
outVals.set(xVals.subarray(xOffset, xOffset + size[1]), outOffset);
outOffset += size[1];
}
}
function slice3d(xVals, xStride1, xStride2, outVals, begin, size) {
let outOffset = 0;
const beginI = begin[0];
const beginJ = begin[1];
const beginK = begin[2];
const endI = beginI + size[0];
const endJ = beginJ + size[1];
for (let i = beginI; i < endI; i++) {
for (let j = beginJ; j < endJ; j++) {
const xOffset = i * xStride1 + j * xStride2 + beginK;
outVals.set(xVals.subarray(xOffset, xOffset + size[2]), outOffset);
outOffset += size[2];
}
}
}
function slice4d(xVals, xStride1, xStride2, xStride3, outVals, begin, size) {
let outOffset = 0;
const beginI = begin[0];
const beginJ = begin[1];
const beginK = begin[2];
const endI = beginI + size[0];
const endJ = beginJ + size[1];
const endK = beginK + size[2];
const beginL = begin[3];
for (let i = beginI; i < endI; i++) {
for (let j = beginJ; j < endJ; j++) {
for (let k = beginK; k < endK; k++) {
const xOffset = i * xStride1 + j * xStride2 + k * xStride3 + beginL;
outVals.set(xVals.subarray(xOffset, xOffset + size[3]), outOffset);
outOffset += size[3];
}
}
}
}
export const sliceConfig = {
kernelName: Slice,
backendName: 'wasm',
kernelFunc: slice,
};
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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, KernelConfig, KernelFunc, Slice, slice_util, SliceAttrs, SliceInputs, TypedArray, util} from '@tensorflow/tfjs-core';\n\nimport {BackendWasm} from '../backend_wasm';\nimport {sliceImplCPU} from '../kernel_utils/shared';\n\nexport function slice(\n    args: {inputs: SliceInputs, attrs: SliceAttrs, backend: BackendWasm}) {\n  const {inputs: {x}, attrs: {begin, size}, backend} = args;\n\n  const [begin_, size_] = slice_util.parseSliceParams(x, begin, size);\n\n  const isContinous = slice_util.isSliceContinous(x.shape, begin_, size_);\n  const xVals = backend.readSync(x.dataId);\n  const out = backend.makeOutput(size_, x.dtype);\n  const xStrides = util.computeStrides(x.shape);\n  const outData = backend.dataIdMap.get(out.dataId);\n\n  if (isContinous) {\n    const flatOffset = slice_util.computeFlatOffset(begin_, xStrides);\n\n    if (x.dtype === 'string') {\n      outData.stringBytes =\n          (xVals as Uint8Array[])\n              .slice(flatOffset, flatOffset + util.sizeFromShape(size_));\n    } else {\n      const outVals = backend.typedArrayFromHeap(out);\n      outVals.set(\n          (xVals as TypedArray)\n              .subarray(flatOffset, flatOffset + util.sizeFromShape(size_)));\n    }\n\n    return out;\n  }\n\n  if (x.dtype === 'string') {\n    const res = sliceImplCPU(xVals, begin_, size_, x.shape, x.dtype);\n    outData.stringBytes = res as Uint8Array[];\n    return out;\n  }\n\n  const outVals = backend.typedArrayFromHeap(out);\n  const rank = x.shape.length;\n  if (rank === 2) {\n    slice2d(\n        xVals as TypedArray, xStrides[0], outVals, begin_ as [number, number],\n        size_ as [number, number]);\n  } else if (rank === 3) {\n    slice3d(\n        xVals as TypedArray, xStrides[0], xStrides[1], outVals,\n        begin_ as [number, number, number], size_ as [number, number, number]);\n  } else if (rank === 4) {\n    slice4d(\n        xVals as TypedArray, xStrides[0], xStrides[1], xStrides[2], outVals,\n        begin_ as [number, number, number, number],\n        size_ as [number, number, number, number]);\n  } else {\n    const res =\n        sliceImplCPU(xVals, begin_, size_, x.shape, x.dtype) as TypedArray;\n    outVals.set(res);\n  }\n\n  return out;\n}\n\nfunction slice2d(\n    xVals: backend_util.TypedArray, xStride: number,\n    outVals: backend_util.TypedArray, begin: [number, number],\n    size: [number, number]): void {\n  let outOffset = 0;\n  const beginI = begin[0];\n  const beginJ = begin[1];\n  const endI = beginI + size[0];\n  for (let i = beginI; i < endI; i++) {\n    const xOffset = i * xStride + beginJ;\n    outVals.set(xVals.subarray(xOffset, xOffset + size[1]), outOffset);\n    outOffset += size[1];\n  }\n}\n\nfunction slice3d(\n    xVals: backend_util.TypedArray, xStride1: number, xStride2: number,\n    outVals: backend_util.TypedArray, begin: [number, number, number],\n    size: [number, number, number]): void {\n  let outOffset = 0;\n  const beginI = begin[0];\n  const beginJ = begin[1];\n  const beginK = begin[2];\n  const endI = beginI + size[0];\n  const endJ = beginJ + size[1];\n  for (let i = beginI; i < endI; i++) {\n    for (let j = beginJ; j < endJ; j++) {\n      const xOffset = i * xStride1 + j * xStride2 + beginK;\n      outVals.set(xVals.subarray(xOffset, xOffset + size[2]), outOffset);\n      outOffset += size[2];\n    }\n  }\n}\n\nfunction slice4d(\n    xVals: backend_util.TypedArray, xStride1: number, xStride2: number,\n    xStride3: number, outVals: backend_util.TypedArray,\n    begin: [number, number, number, number],\n    size: [number, number, number, number]): void {\n  let outOffset = 0;\n  const beginI = begin[0];\n  const beginJ = begin[1];\n  const beginK = begin[2];\n  const endI = beginI + size[0];\n  const endJ = beginJ + size[1];\n  const endK = beginK + size[2];\n  const beginL = begin[3];\n\n  for (let i = beginI; i < endI; i++) {\n    for (let j = beginJ; j < endJ; j++) {\n      for (let k = beginK; k < endK; k++) {\n        const xOffset = i * xStride1 + j * xStride2 + k * xStride3 + beginL;\n        outVals.set(xVals.subarray(xOffset, xOffset + size[3]), outOffset);\n        outOffset += size[3];\n      }\n    }\n  }\n}\n\nexport const sliceConfig: KernelConfig = {\n  kernelName: Slice,\n  backendName: 'wasm',\n  kernelFunc: slice as unknown as KernelFunc,\n};\n"]}