Function maxPoolGrad

tfjs-backend-webgl/src/kernels/MaxPoolGrad.ts:24–49

(args: {
  inputs: MaxPoolGradInputs,
  backend: MathBackendWebGL,
  attrs: MaxPoolGradAttrs
})

import {assertNotComplex} from '../webgl_util';

export function maxPoolGrad(args: {
  inputs: MaxPoolGradInputs,
  backend: MathBackendWebGL,
  attrs: MaxPoolGradAttrs
}): TensorInfo {
  const {inputs, backend, attrs} = args;
  const {dy, input, output} = inputs;
  const x = input;
  assertNotComplex([input, output], 'maxPoolGrad');
  const {filterSize, strides, pad, dimRoundingMode} = attrs;

  const convInfo = backend_util.computePool2DInfo(
      x.shape as [number, number, number, number], filterSize, strides,
      1 /* dilations */, pad, dimRoundingMode);
  const getPositions = true;
  const maxPoolPositionsProgram =
      new Pool2DProgram(convInfo, 'max', getPositions);
  const maxPoolPositions: TensorInfo =
      backend.runWebGLProgram(maxPoolPositionsProgram, [x], x.dtype);

  const maxPoolBackPropProgram = new MaxPool2DBackpropProgram(convInfo);
  const result = backend.runWebGLProgram(
      maxPoolBackPropProgram, [dy, maxPoolPositions], x.dtype);
  backend.disposeIntermediateTensorInfo(maxPoolPositions);
  return result;
}

export const maxPoolGradConfig: KernelConfig = {
  kernelName: MaxPoolGrad,