@tensorflow/tfjs-core
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Hardware-accelerated JavaScript library for machine intelligence
38 lines • 1.45 kB
JavaScript
/**
* @license
* Copyright 2020 Google Inc. 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 { Sum } from '../kernel_names';
import { mul } from '../ops/mul';
import { ones } from '../ops/ones';
import { reshape } from '../ops/reshape';
import { parseAxisParam } from '../util';
export const sumGradConfig = {
kernelName: Sum,
inputsToSave: ['x'],
gradFunc: (dy, saved, attrs) => {
const [x] = saved;
const expandedDyShape = x.shape.slice();
const { axis } = attrs;
const axes = parseAxisParam(axis, x.shape);
axes.forEach(axis => {
expandedDyShape[axis] = 1;
});
const expandedDy = reshape(dy, expandedDyShape);
const derX = mul(expandedDy, ones(x.shape, 'float32'));
return { x: () => derX };
}
};
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