/**
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* @license
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* Copyright 2020 Google LLC. All Rights Reserved.
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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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* =============================================================================
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*/
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import { backend_util, DepthwiseConv2dNativeBackpropFilter, TensorBuffer } from '@tensorflow/tfjs-core';
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import { assertNotComplex } from '../cpu_util';
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export function depthwiseConv2dNativeBackpropFilter(args) {
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const { inputs, backend, attrs } = args;
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const { x, dy } = inputs;
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const { strides, dilations, pad, dimRoundingMode, filterShape } = attrs;
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assertNotComplex([x, dy], 'depthwiseConv2dNativeBackpropFilter');
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const convInfo = backend_util.computeConv2DInfo(x.shape, filterShape, strides, dilations, pad, dimRoundingMode, true /* depthwise */);
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const { strideHeight, strideWidth, filterHeight, filterWidth } = convInfo;
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const dW = new TensorBuffer(convInfo.filterShape, 'float32');
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const leftPad = convInfo.padInfo.left;
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const topPad = convInfo.padInfo.top;
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const chMul = convInfo.outChannels / convInfo.inChannels;
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const xVals = backend.data.get(x.dataId).values;
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const xBuf = new TensorBuffer(x.shape, x.dtype, xVals);
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const dyVals = backend.data.get(dy.dataId).values;
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const dyBuf = new TensorBuffer(dy.shape, dy.dtype, dyVals);
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for (let wR = 0; wR < filterHeight; ++wR) {
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const yRMin = Math.max(0, Math.ceil((topPad - wR) / strideHeight));
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const yRMax = Math.min(convInfo.outHeight, (convInfo.inHeight + topPad - wR) / strideHeight);
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for (let wC = 0; wC < filterWidth; ++wC) {
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const yCMin = Math.max(0, Math.ceil((leftPad - wC) / strideWidth));
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const yCMax = Math.min(convInfo.outWidth, (convInfo.inWidth + leftPad - wC) / strideWidth);
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for (let d2 = 0; d2 < convInfo.outChannels; ++d2) {
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const d1 = Math.trunc(d2 / chMul);
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const dm = d2 % chMul;
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let dotProd = 0;
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for (let b = 0; b < convInfo.batchSize; ++b) {
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for (let yR = yRMin; yR < yRMax; ++yR) {
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const xR = wR + yR * strideHeight - topPad;
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for (let yC = yCMin; yC < yCMax; ++yC) {
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const xC = wC + yC * strideWidth - leftPad;
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dotProd += xBuf.get(b, xR, xC, d1) *
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dyBuf.get(b, yR, yC, d2);
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}
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}
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}
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dW.set(dotProd, wR, wC, d1, dm);
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}
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}
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}
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return backend.makeTensorInfo(dW.shape, dW.dtype, dW.values);
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}
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export const depthwiseConv2dNativeBackpropFilterConfig = {
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kernelName: DepthwiseConv2dNativeBackpropFilter,
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backendName: 'cpu',
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kernelFunc: depthwiseConv2dNativeBackpropFilter
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};
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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, DepthwiseConv2dNativeBackpropFilter, DepthwiseConv2dNativeBackpropFilterAttrs, DepthwiseConv2dNativeBackpropFilterInputs, KernelConfig, KernelFunc, TensorBuffer, TensorInfo, TypedArray} from '@tensorflow/tfjs-core';\n\nimport {MathBackendCPU} from '../backend_cpu';\nimport {assertNotComplex} from '../cpu_util';\n\nexport function depthwiseConv2dNativeBackpropFilter(args: {\n  inputs: DepthwiseConv2dNativeBackpropFilterInputs,\n  backend: MathBackendCPU,\n  attrs: DepthwiseConv2dNativeBackpropFilterAttrs\n}): TensorInfo {\n  const {inputs, backend, attrs} = args;\n  const {x, dy} = inputs;\n  const {strides, dilations, pad, dimRoundingMode, filterShape} = attrs;\n\n  assertNotComplex([x, dy], 'depthwiseConv2dNativeBackpropFilter');\n\n  const convInfo = backend_util.computeConv2DInfo(\n      x.shape as [number, number, number, number], filterShape, strides,\n      dilations, pad, dimRoundingMode, true /* depthwise */);\n\n  const {strideHeight, strideWidth, filterHeight, filterWidth} = convInfo;\n\n  const dW = new TensorBuffer(convInfo.filterShape, 'float32');\n\n  const leftPad = convInfo.padInfo.left;\n  const topPad = convInfo.padInfo.top;\n  const chMul = convInfo.outChannels / convInfo.inChannels;\n\n  const xVals = backend.data.get(x.dataId).values as TypedArray;\n  const xBuf = new TensorBuffer(x.shape, x.dtype, xVals);\n  const dyVals = backend.data.get(dy.dataId).values as TypedArray;\n  const dyBuf = new TensorBuffer(dy.shape, dy.dtype, dyVals);\n  for (let wR = 0; wR < filterHeight; ++wR) {\n    const yRMin = Math.max(0, Math.ceil((topPad - wR) / strideHeight));\n    const yRMax = Math.min(\n        convInfo.outHeight, (convInfo.inHeight + topPad - wR) / strideHeight);\n\n    for (let wC = 0; wC < filterWidth; ++wC) {\n      const yCMin = Math.max(0, Math.ceil((leftPad - wC) / strideWidth));\n      const yCMax = Math.min(\n          convInfo.outWidth, (convInfo.inWidth + leftPad - wC) / strideWidth);\n\n      for (let d2 = 0; d2 < convInfo.outChannels; ++d2) {\n        const d1 = Math.trunc(d2 / chMul);\n        const dm = d2 % chMul;\n\n        let dotProd = 0;\n        for (let b = 0; b < convInfo.batchSize; ++b) {\n          for (let yR = yRMin; yR < yRMax; ++yR) {\n            const xR = wR + yR * strideHeight - topPad;\n            for (let yC = yCMin; yC < yCMax; ++yC) {\n              const xC = wC + yC * strideWidth - leftPad;\n              dotProd += (xBuf.get(b, xR, xC, d1) as number) *\n                  (dyBuf.get(b, yR, yC, d2) as number);\n            }\n          }\n        }\n        dW.set(dotProd, wR, wC, d1, dm);\n      }\n    }\n  }\n\n  return backend.makeTensorInfo(dW.shape, dW.dtype, dW.values);\n}\n\nexport const depthwiseConv2dNativeBackpropFilterConfig: KernelConfig = {\n  kernelName: DepthwiseConv2dNativeBackpropFilter,\n  backendName: 'cpu',\n  kernelFunc: depthwiseConv2dNativeBackpropFilter as unknown as KernelFunc\n};\n"]}
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