gx

chenyc

2025-06-12 7b72ac13a83764a662159d4a49b7fffb90476ecb

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/**
 * @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 { Pow } from '../kernel_names';
import * as broadcast_util from '../ops/broadcast_util';
import { cast } from '../ops/cast';
import { greater } from '../ops/greater';
import { log } from '../ops/log';
import { mul } from '../ops/mul';
import { pow } from '../ops/pow';
import { reshape } from '../ops/reshape';
import { scalar } from '../ops/scalar';
import { sub } from '../ops/sub';
import { sum } from '../ops/sum';
import { where } from '../ops/where';
import { zerosLike } from '../ops/zeros_like';
export const powGradConfig = {
    kernelName: Pow,
    inputsToSave: ['a', 'b'],
    outputsToSave: [true],
    gradFunc: (dy, saved) => {
        const [a, b, y] = saved;
        const base = a;
        const exp = b;
        const outShape = broadcast_util.assertAndGetBroadcastShape(base.shape, exp.shape);
        const derBase = () => {
            const expFloat = cast(exp, 'float32');
            let res = mul(dy, mul(expFloat, pow(base, sub(expFloat, scalar(1)))));
            const reduceAxes = broadcast_util.getReductionAxes(base.shape, outShape);
            if (reduceAxes.length > 0) {
                res = sum(res, reduceAxes);
            }
            return reshape(res, base.shape);
        };
        const derExp = () => {
            const condition = greater(base, 0);
            const logBase = where(condition, log(base), zerosLike(base));
            let res = mul(dy, mul(y, logBase));
            const reduceAxes = broadcast_util.getReductionAxes(exp.shape, outShape);
            if (reduceAxes.length > 0) {
                res = sum(res, reduceAxes);
            }
            return reshape(res, exp.shape);
        };
        return { a: derBase, b: derExp };
    }
};
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A9IGI7XG4gICAgY29uc3Qgb3V0U2hhcGUgPVxuICAgICAgICBicm9hZGNhc3RfdXRpbC5hc3NlcnRBbmRHZXRCcm9hZGNhc3RTaGFwZShiYXNlLnNoYXBlLCBleHAuc2hhcGUpO1xuXG4gICAgY29uc3QgZGVyQmFzZSA9ICgpID0+IHtcbiAgICAgIGNvbnN0IGV4cEZsb2F0ID0gY2FzdChleHAsICdmbG9hdDMyJyk7XG4gICAgICBsZXQgcmVzID0gbXVsKGR5LCBtdWwoZXhwRmxvYXQsIHBvdyhiYXNlLCBzdWIoZXhwRmxvYXQsIHNjYWxhcigxKSkpKSk7XG4gICAgICBjb25zdCByZWR1Y2VBeGVzID0gYnJvYWRjYXN0X3V0aWwuZ2V0UmVkdWN0aW9uQXhlcyhiYXNlLnNoYXBlLCBvdXRTaGFwZSk7XG4gICAgICBpZiAocmVkdWNlQXhlcy5sZW5ndGggPiAwKSB7XG4gICAgICAgIHJlcyA9IHN1bShyZXMsIHJlZHVjZUF4ZXMpO1xuICAgICAgfVxuICAgICAgcmV0dXJuIHJlc2hhcGUocmVzLCBiYXNlLnNoYXBlKTtcbiAgICB9O1xuICAgIGNvbnN0IGRlckV4cCA9ICgpID0+IHtcbiAgICAgIGNvbnN0IGNvbmRpdGlvbiA9IGdyZWF0ZXIoYmFzZSwgMCk7XG4gICAgICBjb25zdCBsb2dCYXNlID0gd2hlcmUoY29uZGl0aW9uLCBsb2coYmFzZSksIHplcm9zTGlrZShiYXNlKSk7XG4gICAgICBsZXQgcmVzID0gbXVsKGR5LCBtdWwoeSwgbG9nQmFzZSkpO1xuICAgICAgY29uc3QgcmVkdWNlQXhlcyA9IGJyb2FkY2FzdF91dGlsLmdldFJlZHVjdGlvbkF4ZXMoZXhwLnNoYXBlLCBvdXRTaGFwZSk7XG4gICAgICBpZiAocmVkdWNlQXhlcy5sZW5ndGggPiAwKSB7XG4gICAgICAgIHJlcyA9IHN1bShyZXMsIHJlZHVjZUF4ZXMpO1xuICAgICAgfVxuICAgICAgcmV0dXJuIHJlc2hhcGUocmVzLCBleHAuc2hhcGUpO1xuICAgIH07XG4gICAgcmV0dXJuIHthOiBkZXJCYXNlLCBiOiBkZXJFeHB9O1xuICB9XG59O1xuIl19