@tensorflow/tfjs-core/dist/gradients/Softmax_grad.js

Hardware-accelerated JavaScript library for machine intelligence

/**
 * @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 { Softmax } from '../kernel_names';
import { mul } from '../ops/mul';
import { sub } from '../ops/sub';
import { sum } from '../ops/sum';
export const softmaxGradConfig = {
    kernelName: Softmax,
    outputsToSave: [true],
    gradFunc: (dy, saved, attrs) => {
        const [y] = saved;
        const { dim } = attrs;
        const keepDims = true;
        const dyTimesY = mul(dy, y);
        return {
            logits: () => sub(dyTimesY, mul(sum(dyTimesY, [dim], keepDims), y))
        };
    }
};
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