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| 1 | +/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve. |
| 2 | +
|
| 3 | + Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | + you may not use this file except in compliance with the License. |
| 5 | + You may obtain a copy of the License at |
| 6 | +
|
| 7 | + http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | +
|
| 9 | + Unless required by applicable law or agreed to in writing, software |
| 10 | + distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | + See the License for the specific language governing permissions and |
| 13 | + limitations under the License. */ |
| 14 | + |
| 15 | +#pragma once |
| 16 | +#include "paddle/framework/op_desc.h" |
| 17 | +#include "paddle/framework/operator.h" |
| 18 | + |
| 19 | +namespace paddle { |
| 20 | +namespace framework { |
| 21 | + |
| 22 | +class GradOpDescMakerBase { |
| 23 | + public: |
| 24 | + explicit GradOpDescMakerBase(const OpDescBind& fwd_op) : fwd_op_(fwd_op) {} |
| 25 | + |
| 26 | + virtual ~GradOpDescMakerBase() = default; |
| 27 | + virtual std::vector<std::unique_ptr<OpDescBind>> operator()() const = 0; |
| 28 | + |
| 29 | + protected: |
| 30 | + static std::vector<std::string> ToGradNames( |
| 31 | + const std::vector<std::string>& var_names) { |
| 32 | + std::vector<std::string> ret_val; |
| 33 | + ret_val.reserve(var_names.size()); |
| 34 | + std::transform(var_names.begin(), var_names.end(), |
| 35 | + std::back_inserter(ret_val), GradVarName); |
| 36 | + return ret_val; |
| 37 | + } |
| 38 | + |
| 39 | + std::vector<std::string> InputGrad(const std::string& name) const { |
| 40 | + return ToGradNames(fwd_op_.Input(name)); |
| 41 | + } |
| 42 | + |
| 43 | + std::vector<std::string> OutputGrad(const std::string& name) const { |
| 44 | + return ToGradNames(fwd_op_.Output(name)); |
| 45 | + } |
| 46 | + |
| 47 | + std::vector<std::string> InputNames() const { |
| 48 | + return this->fwd_op_.InputNames(); |
| 49 | + } |
| 50 | + |
| 51 | + std::vector<std::string> OutputNames() const { |
| 52 | + return this->fwd_op_.OutputNames(); |
| 53 | + } |
| 54 | + |
| 55 | + std::vector<std::string> Input(const std::string& name) const { |
| 56 | + return fwd_op_.Input(name); |
| 57 | + } |
| 58 | + |
| 59 | + std::vector<std::string> Output(const std::string& name) const { |
| 60 | + return fwd_op_.Output(name); |
| 61 | + } |
| 62 | + |
| 63 | + const std::unordered_map<std::string, Attribute>& Attrs() const { |
| 64 | + return fwd_op_.GetAttrMap(); |
| 65 | + } |
| 66 | + |
| 67 | + const Attribute& GetAttr(const std::string& name) const { |
| 68 | + auto& map = fwd_op_.GetAttrMap(); |
| 69 | + auto it = map.find(name); |
| 70 | + PADDLE_ENFORCE(it != map.end(), "Cannot find attribute %s", name); |
| 71 | + return it->second; |
| 72 | + } |
| 73 | + |
| 74 | + std::string ForwardOpType() const { return this->fwd_op_.Type(); } |
| 75 | + |
| 76 | + private: |
| 77 | + const OpDescBind& fwd_op_; |
| 78 | +}; |
| 79 | + |
| 80 | +class SingleGradOpDescMaker : public GradOpDescMakerBase { |
| 81 | + public: |
| 82 | + using GradOpDescMakerBase::GradOpDescMakerBase; |
| 83 | + |
| 84 | + std::vector<std::unique_ptr<OpDescBind>> operator()() const { |
| 85 | + std::vector<std::unique_ptr<OpDescBind>> retv; |
| 86 | + retv.emplace_back(this->Apply()); |
| 87 | + return retv; |
| 88 | + } |
| 89 | + |
| 90 | + protected: |
| 91 | + virtual std::unique_ptr<OpDescBind> Apply() const = 0; |
| 92 | +}; |
| 93 | + |
| 94 | +class DefaultGradOpDescMaker : public SingleGradOpDescMaker { |
| 95 | + public: |
| 96 | + using SingleGradOpDescMaker::SingleGradOpDescMaker; |
| 97 | + |
| 98 | + protected: |
| 99 | + virtual std::unique_ptr<OpDescBind> Apply() const { |
| 100 | + auto* grad = new OpDescBind(); |
| 101 | + grad->SetType(this->GradOpType()); |
| 102 | + |
| 103 | + for (auto& input_param : this->InputNames()) { |
| 104 | + grad->SetInput(input_param, this->Input(input_param)); |
| 105 | + grad->SetOutput(GradVarName(input_param), this->InputGrad(input_param)); |
| 106 | + } |
| 107 | + |
| 108 | + for (auto& output_param : this->OutputNames()) { |
| 109 | + grad->SetInput(output_param, this->Output(output_param)); |
| 110 | + grad->SetInput(GradVarName(output_param), this->OutputGrad(output_param)); |
| 111 | + } |
| 112 | + |
| 113 | + grad->SetAttrMap(this->Attrs()); |
| 114 | + |
| 115 | + return std::unique_ptr<OpDescBind>(grad); |
| 116 | + } |
| 117 | + |
| 118 | + virtual std::string GradOpType() const { |
| 119 | + return this->ForwardOpType() + "_grad"; |
| 120 | + } |
| 121 | +}; |
| 122 | + |
| 123 | +} // namespace framework |
| 124 | +} // namespace paddle |
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