@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 { Select } from '../kernel_names';
import { cast } from '../ops/cast';
import { logicalNot } from '../ops/logical_not';
import { mul } from '../ops/mul';
import { zerosLike } from '../ops/zeros_like';
export const selectGradConfig = {
kernelName: Select,
inputsToSave: ['condition'],
gradFunc: (dy, saved) => {
const [condition] = saved;
return {
// TODO(julianoks): Return null for condition gradient
// when backprop supports it.
condition: () => cast(zerosLike(condition), 'float32'),
t: () => mul(dy, cast(condition, dy.dtype)),
e: () => mul(dy, cast(logicalNot(condition), dy.dtype))
};
}
};
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