41 lines
1.7 KiB
C++
41 lines
1.7 KiB
C++
/* Copyright 2017 The TensorFlow Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==============================================================================*/
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#ifndef TENSORFLOW_CC_FRAMEWORK_WHILE_GRADIENTS_H_
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#define TENSORFLOW_CC_FRAMEWORK_WHILE_GRADIENTS_H_
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#include "tensorflow/cc/framework/ops.h"
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#include "tensorflow/cc/framework/scope.h"
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#include "tensorflow/core/graph/while_context.h"
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// Utility functions for constructing while loop gradients
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namespace tensorflow {
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// Adds the gradient computation for the while loop associated with
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// `while_ctx`. `grad_inputs` are the partial derivatives w.r.t. the loop
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// outputs, i.e. the exit nodes. The partial derivatives w.r.t. the loop
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// inputs, i.e. the input loop vars, are returned in `grad_outputs`.
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// `grad_inputs` and `grad_outputs` are both in loop-variable order, as defined
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// by the original inputs to BuildWhileLoop().
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// TODO(skyewm): maybe comment on NoGradient once it's supported
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Status AddWhileLoopGradient(WhileContext* while_ctx, const Scope& scope,
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const std::vector<Output>& grad_inputs,
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std::vector<Output>* grad_outputs);
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} // namespace tensorflow
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#endif // TENSORFLOW_CC_FRAMEWORK_WHILE_GRADIENTS_H_
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