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58 lines
1.6 KiB
58 lines
1.6 KiB
5 years ago
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// 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 <unordered_map>
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#include <utility>
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#include <vector>
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#include "paddle/fluid/imperative/backward_strategy.h"
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#include "paddle/fluid/imperative/engine.h"
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#include "paddle/fluid/imperative/gradient_accumulator.h"
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namespace paddle {
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namespace imperative {
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class VarBase;
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class OpBase;
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class BasicEngine : public Engine {
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public:
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void Init(VarBase* var, const detail::BackwardStrategy& strategy);
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void Execute() override;
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private:
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void PrepareDeps();
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void CheckBackwardInputs(const OpBase& op);
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void PrepareGradAccumulators(const OpBase& op);
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void Clear();
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private:
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std::shared_ptr<GradOpNode> init_node_;
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detail::BackwardStrategy backward_strategy_;
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std::unordered_map<GradOpNode*, size_t> node_deps_;
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std::unordered_map<VariableWrapper*, std::unique_ptr<GradientAccumulator>>
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accumulators_;
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std::vector<std::pair<GradientAccumulator*, std::shared_ptr<VariableWrapper>>>
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need_accu_var_list_;
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};
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} // namespace imperative
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} // namespace paddle
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