text: /**
   * Copyright 2019 Huawei Technologies Co., Ltd
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  #ifndef MINDSPORE_CCSRC_BACKEND_OPTIMIZER_PASS_COMMUNICATION_OP_FUSION_H_
  #define MINDSPORE_CCSRC_BACKEND_OPTIMIZER_PASS_COMMUNICATION_OP_FUSION_H_
  #include <utility>
  #include <vector>
  #include <string>
  
  #include "backend/optimizer/common/pass.h"
  #include "ir/func_graph.h"
  #include "ir/anf.h"
  #include "utils/utils.h"
  
  namespace mindspore {
  namespace opt {
  struct CommunicationOpInfo {
    std::vector<CNodePtr> communication_op_nodes;
    std::vector<float> input_grad_size;
    std::vector<float> input_grad_time;
  };
  
  class CommunicationOpFusion : public Pass {
   public:
    explicit CommunicationOpFusion(const std::string &name, std::string op_name, size_t groups = 1)
        : Pass(name), op_name_(std::move(op_name)), groups_(groups) {}
    ~CommunicationOpFusion() override = default;
    bool Run(const FuncGraphPtr &graph) override;
  
   private:
    bool DoFusion(const FuncGraphPtr &func_graph, const CommunicationOpInfo &communication_op_info, size_t segment_num,
                  const std::vector<size_t> &segment_index) const;
    AnfNodePtr CreateFusedCommunicationOp(const FuncGraphPtr &func_graph,
                                          const CommunicationOpInfo &communication_op_info, size_t start_index,
                                          size_t end_index) const;
    bool GetSplitSegments(const CommunicationOpInfo &communication_op_info, size_t *segment_num,
                          std::vector<size_t> *segment_index, const std::string &group) const;
    std::string op_name_;
    size_t groups_ = 1;
  };
  
  class AllReduceFusion : public CommunicationOpFusion {
   public:
    explicit AllReduceFusion(size_t groups = 1) : CommunicationOpFusion("all_reduce_fusion", kAllReduceOpName, groups) {}
    ~AllReduceFusion() override = default;
  };
  
  class AllGatherFusion : public CommunicationOpFusion {
   public:
    explicit AllGatherFusion(size_t groups = 1) : CommunicationOpFusion("all_gather_fusion", kAllGatherOpName, groups) {}
    ~AllGatherFusion() override = default;
  };
  
  class BroadcastFusion : public CommunicationOpFusion {
   public:
    explicit BroadcastFusion(size_t groups = 1) : CommunicationOpFusion("broadcast_fusion", kBroadcastOpName, groups) {}
    ~BroadcastFusion() override = default;
  };
  
  class ReduceScatterFusion : public CommunicationOpFusion {
   public:
    explicit ReduceScatterFusion(size_t groups = 1)
        : CommunicationOpFusion("reduce_scatter_fusion", kReduceScatterOpName, groups) {}
    ~ReduceScatterFusion() override = default;
  };
  }  // namespace opt
  }  // namespace mindspore
  #endif  // MINDSPORE_CCSRC_BACKEND_OPTIMIZER_PASS_COMMUNICATION_OP_FUSION_H_
  