@tensorflow/tfjs-core
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Hardware-accelerated JavaScript library for machine intelligence
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JavaScript
/**
* @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 { LogSoftmax } from '../kernel_names';
import { exp } from '../ops/exp';
import { mul } from '../ops/mul';
import { sub } from '../ops/sub';
import { sum } from '../ops/sum';
export const logSoftmaxGradConfig = {
kernelName: LogSoftmax,
inputsToSave: [],
outputsToSave: [true],
gradFunc: (dy, saved, attrs) => {
const [value] = saved;
const { axis } = attrs;
return {
logits: () => {
const keepDims = true;
const softmax = exp(value);
return sub(dy, mul(sum(dy, axis, keepDims), softmax));
}
};
}
};
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