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96 lines
2.5 KiB
96 lines
2.5 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 <vector>
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#include "paddle/framework/variable.h"
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namespace paddle {
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namespace framework {
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/**
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* @brief Scope that manage all variables.
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*
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* Scope is an association of a name to Variable. All variables belong to
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* Scope. You need to specify a scope to run a Net, i.e., `net.Run(&scope)`.
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* One net can run in different scopes and update different variable in the
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* scope.
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*/
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class Scope {
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public:
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/**
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* @brief Initialize s Scope without parent.
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*/
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Scope() {}
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/**
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* @brief Initialize a Scope with parent.
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*/
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explicit Scope(const std::shared_ptr<Scope>& parent) : parent_(parent) {}
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/**
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* @brief Create Variable
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*
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* Create Variable in this Scope. Return the exist one if Variable already
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* been created.
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*/
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Variable* CreateVariable(const std::string& name) {
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auto var = GetVariable(name);
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if (var) {
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return var;
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} else {
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vars_[name] = std::unique_ptr<Variable>(new Variable());
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return GetVariable(name);
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}
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}
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/**
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* @brief Get Variable.
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*
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* Get Variable from this Scope, this function will recursive find Variable
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* from it's parent scope. Return nullptr if not found.
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*/
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Variable* GetVariable(const std::string& name) const {
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auto it = vars_.find(name);
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if (it != vars_.end()) {
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return it->second.get();
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} else if (parent_ != nullptr) {
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return parent_->GetVariable(name);
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} else {
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return nullptr;
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}
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}
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/**
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* @brief If this scope has a Var named name.
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*
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* Find if there is a Variable in this scope and it's parent scope
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*/
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bool HasVariable(const std::string& name) const {
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return (vars_.find(name) != vars_.end() ||
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(parent_ && parent_->HasVariable(name)));
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}
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private:
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std::unordered_map<std::string, std::unique_ptr<Variable>> vars_;
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std::shared_ptr<Scope> parent_{nullptr};
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};
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} // namespace framework
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} // namespace paddle
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