57 lines
1.8 KiB
57 lines
1.8 KiB
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
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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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#pragma once
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#include <string>
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#include <unordered_map>
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#include <unordered_set>
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#include "paddle/framework/operator.h"
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#include "paddle/framework/program_desc.h"
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namespace paddle {
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namespace framework {
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// Create the backward operator from a forward operator.
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// TODO(yuyang18): Add more API reference comment.
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extern std::unique_ptr<OperatorBase> Backward(
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const OperatorBase& forwardOp,
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const std::unordered_set<std::string>& no_grad_vars);
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struct GradVarInfo {
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GradVarInfo() {}
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GradVarInfo(const std::string& name, int block_idx, int op_idx)
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: name_(name), block_idx_(block_idx), op_idx_(op_idx) {}
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bool operator==(const GradVarInfo& b) const {
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return name_ == b.name_ && block_idx_ == b.block_idx_ &&
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op_idx_ == b.op_idx_;
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}
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std::string name_;
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int block_idx_;
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int op_idx_;
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};
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using ParamGradInfoMap = std::unordered_map<std::string /*fwd_var_name*/,
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GradVarInfo /*grad_var_info*/>;
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ParamGradInfoMap AppendBackward(
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ProgramDescBind& program_desc, const VarDescBind& target,
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const std::unordered_set<std::string>& no_grad_vars);
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} // namespace framework
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} // namespace paddle
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