/** * @license * Copyright 2020 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, Conv2DBackpropInput, TensorBuffer, util } from '@tensorflow/tfjs-core'; import { assertNotComplex } from '../cpu_util'; export function conv2DBackpropInput(args) { const { inputs, backend, attrs } = args; const { dy, filter } = inputs; const { inputShape, strides, pad, dataFormat, dimRoundingMode } = attrs; assertNotComplex([dy, filter], 'conv2dBackpropInput'); const filterStrides = util.computeStrides(filter.shape); const dyStrides = util.computeStrides(dy.shape); let $dataFormat = backend_util.convertConv2DDataFormat(dataFormat); const convInfo = backend_util.computeConv2DInfo(inputShape, filter.shape, strides, 1 /* dilations */, pad, dimRoundingMode, false, $dataFormat); const dx = new TensorBuffer(convInfo.inShape, 'float32'); const dxValues = dx.values; const dyValues = backend.data.get(dy.dataId).values; const fltValues = backend.data.get(filter.dataId).values; const [fltS0, fltS1, fltS2] = filterStrides; const { batchSize, filterHeight, filterWidth, inChannels, inHeight, inWidth, outChannels, outHeight, outWidth, strideHeight, strideWidth } = convInfo; $dataFormat = convInfo.dataFormat; const topPad = filterHeight - 1 - convInfo.padInfo.top; const leftPad = filterWidth - 1 - convInfo.padInfo.left; const isChannelsLast = $dataFormat === 'channelsLast'; const xBatchStride = dx.strides[0]; const xRowStride = isChannelsLast ? dx.strides[1] : dx.strides[2]; const xColStride = isChannelsLast ? dx.strides[2] : 1; const xChannelStride = isChannelsLast ? 1 : dx.strides[1]; const yBatchStride = dyStrides[0]; const yRowStride = isChannelsLast ? dyStrides[1] : dyStrides[2]; const yColStride = isChannelsLast ? dyStrides[2] : 1; const yChannelStride = isChannelsLast ? 1 : dyStrides[1]; for (let b = 0; b < batchSize; ++b) { for (let d1 = 0; d1 < inChannels; ++d1) { for (let xR = 0; xR < inHeight; ++xR) { const xRCorner = xR - topPad; const xRMin = Math.max(0, Math.ceil(xRCorner / strideHeight)); const yRMax = Math.min(outHeight, (filterHeight + xRCorner) / strideHeight); for (let xC = 0; xC < inWidth; ++xC) { const xCCorner = xC - leftPad; const xCMin = Math.max(0, Math.ceil(xCCorner / strideWidth)); const yCMax = Math.min(outWidth, (filterWidth + xCCorner) / strideWidth); let dotProd = 0; for (let yR = xRMin; yR < yRMax; ++yR) { const wR = yR * strideHeight - xRCorner; for (let yC = xCMin; yC < yCMax; ++yC) { const wC = yC * strideWidth - xCCorner; const dyOffset = yBatchStride * b + yRowStride * yR + yColStride * yC; const fltOffset = fltS0 * (filterHeight - 1 - wR) + fltS1 * (filterWidth - 1 - wC) + fltS2 * d1; for (let d2 = 0; d2 < outChannels; ++d2) { const pixel = dyValues[dyOffset + yChannelStride * d2]; const weight = fltValues[fltOffset + d2]; dotProd += pixel * weight; } } } const dxOffset = xBatchStride * b + xRowStride * xR + xColStride * xC + xChannelStride * d1; dxValues[dxOffset] = dotProd; } } } } return backend.makeTensorInfo(dx.shape, dx.dtype, dx.values); } export const conv2DBackpropInputConfig = { kernelName: Conv2DBackpropInput, backendName: 'cpu', kernelFunc: conv2DBackpropInput }; //# 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* @license\n * Copyright 2020 Google LLC. 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, Conv2DBackpropInput, Conv2DBackpropInputAttrs, Conv2DBackpropInputInputs, KernelConfig, KernelFunc, TensorBuffer, TensorInfo, TypedArray, util} from '@tensorflow/tfjs-core';\n\nimport {MathBackendCPU} from '../backend_cpu';\nimport {assertNotComplex} from '../cpu_util';\n\nexport function conv2DBackpropInput(args: {\n  inputs: Conv2DBackpropInputInputs,\n  backend: MathBackendCPU,\n  attrs: Conv2DBackpropInputAttrs\n}): TensorInfo {\n  const {inputs, backend, attrs} = args;\n  const {dy, filter} = inputs;\n  const {inputShape, strides, pad, dataFormat, dimRoundingMode} = attrs;\n\n  assertNotComplex([dy, filter], 'conv2dBackpropInput');\n\n  const filterStrides = util.computeStrides(filter.shape);\n  const dyStrides = util.computeStrides(dy.shape);\n\n  let $dataFormat = backend_util.convertConv2DDataFormat(dataFormat);\n  const convInfo = backend_util.computeConv2DInfo(\n      inputShape, filter.shape as [number, number, number, number], strides,\n      1 /* dilations */, pad, dimRoundingMode, false, $dataFormat);\n\n  const dx = new TensorBuffer(convInfo.inShape, 'float32');\n  const dxValues = dx.values;\n  const dyValues = backend.data.get(dy.dataId).values as TypedArray;\n  const fltValues = backend.data.get(filter.dataId).values as TypedArray;\n  const [fltS0, fltS1, fltS2] = filterStrides;\n  const {\n    batchSize,\n    filterHeight,\n    filterWidth,\n    inChannels,\n    inHeight,\n    inWidth,\n    outChannels,\n    outHeight,\n    outWidth,\n    strideHeight,\n    strideWidth\n  } = convInfo;\n  $dataFormat = convInfo.dataFormat;\n  const topPad = filterHeight - 1 - convInfo.padInfo.top;\n  const leftPad = filterWidth - 1 - convInfo.padInfo.left;\n\n  const isChannelsLast = $dataFormat === 'channelsLast';\n  const xBatchStride = dx.strides[0];\n  const xRowStride = isChannelsLast ? dx.strides[1] : dx.strides[2];\n  const xColStride = isChannelsLast ? dx.strides[2] : 1;\n  const xChannelStride = isChannelsLast ? 1 : dx.strides[1];\n  const yBatchStride = dyStrides[0];\n  const yRowStride = isChannelsLast ? dyStrides[1] : dyStrides[2];\n  const yColStride = isChannelsLast ? dyStrides[2] : 1;\n  const yChannelStride = isChannelsLast ? 1 : dyStrides[1];\n\n  for (let b = 0; b < batchSize; ++b) {\n    for (let d1 = 0; d1 < inChannels; ++d1) {\n      for (let xR = 0; xR < inHeight; ++xR) {\n        const xRCorner = xR - topPad;\n        const xRMin = Math.max(0, Math.ceil(xRCorner / strideHeight));\n        const yRMax =\n            Math.min(outHeight, (filterHeight + xRCorner) / strideHeight);\n\n        for (let xC = 0; xC < inWidth; ++xC) {\n          const xCCorner = xC - leftPad;\n          const xCMin = Math.max(0, Math.ceil(xCCorner / strideWidth));\n          const yCMax =\n              Math.min(outWidth, (filterWidth + xCCorner) / strideWidth);\n\n          let dotProd = 0;\n          for (let yR = xRMin; yR < yRMax; ++yR) {\n            const wR = yR * strideHeight - xRCorner;\n\n            for (let yC = xCMin; yC < yCMax; ++yC) {\n              const wC = yC * strideWidth - xCCorner;\n              const dyOffset =\n                  yBatchStride * b + yRowStride * yR + yColStride * yC;\n              const fltOffset = fltS0 * (filterHeight - 1 - wR) +\n                  fltS1 * (filterWidth - 1 - wC) + fltS2 * d1;\n\n              for (let d2 = 0; d2 < outChannels; ++d2) {\n                const pixel = dyValues[dyOffset + yChannelStride * d2];\n                const weight = fltValues[fltOffset + d2];\n                dotProd += pixel * weight;\n              }\n            }\n          }\n          const dxOffset = xBatchStride * b + xRowStride * xR +\n              xColStride * xC + xChannelStride * d1;\n          dxValues[dxOffset] = dotProd;\n        }\n      }\n    }\n  }\n\n  return backend.makeTensorInfo(dx.shape, dx.dtype, dx.values);\n}\n\nexport const conv2DBackpropInputConfig: KernelConfig = {\n  kernelName: Conv2DBackpropInput,\n  backendName: 'cpu',\n  kernelFunc: conv2DBackpropInput as unknown as KernelFunc\n};\n"]}