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86 lines
2.3 KiB
86 lines
2.3 KiB
// Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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 <memory>
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#include "paddle/fluid/framework/operator.h" // framework::kGradVarSuffix
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#include "paddle/fluid/framework/program_desc.h"
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#include "paddle/fluid/framework/variable.h"
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namespace paddle {
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namespace tape {
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class Variable;
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using VariableHandle = std::shared_ptr<Variable>;
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/*
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* Combination of
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* framework::VarDesc desc_;
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* framework::Variable var_;
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*/
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class Variable {
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public:
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Variable(const std::string pre_fix)
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: desc_(pre_fix + std::to_string(count())) {}
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Variable(const std::string pre_fix, bool is_grad)
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: desc_(pre_fix + (is_grad ? framework::kGradVarSuffix
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: std::to_string(count()))) {}
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~Variable() { LOG(INFO) << "Deleting " << Name(); }
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// Instantiate LoDTensor/SelectedRow
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void InitializeVariable();
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VariableHandle Grad() {
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if (grad_.expired()) {
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VariableHandle new_grad(new Variable(desc_.Name(), true));
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grad_ = new_grad;
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return new_grad;
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} else {
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return VariableHandle(grad_);
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}
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}
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// Stochastic Gradient Descent with Momentum
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// VariableHandle Momentum ();
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// void init(const std::string& initializer,
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// const framework::AttributeMap& attrs);
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// void value() {};
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const framework::VarDesc& Desc() const { return desc_; }
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framework::VarDesc* MutableDesc() { return &desc_; }
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// TODO(tonyyang-svail): No need to expose name
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std::string Name() const { return desc_.Name(); }
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framework::Variable* Var() { return &var_; }
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private:
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int count() {
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static int counter = 0;
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return counter++;
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}
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framework::VarDesc desc_;
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framework::Variable var_;
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std::weak_ptr<Variable> grad_;
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};
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}
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}
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