/* Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.

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. */
syntax = "proto2";
package paddle.framework;
option cc_generic_services = true;

// It can be: LoDTensor、SelectedRows or NCCL_ID
enum VarType {
  LOD_TENSOR = 0;
  SELECTED_ROWS = 1;
  NCCL_ID = 2;
}

// VariableMessage is serialized paddle variable message.
// NOTICE(gongwb):don't modify this proto if you are not
//   not familar with how we serialize in sendrecvop_utils.h
//   and deserilize it in  variable_response.h.
message VariableMessage {
  enum Type {
    // Pod Types
    BOOL = 0;
    INT16 = 1;
    INT32 = 2;
    INT64 = 3;
    FP16 = 4;
    FP32 = 5;
    FP64 = 6;
  }

  message LodData { repeated int64 lod_data = 1; }
  optional string varname = 1;
  // TODO(Yancey1989): reference framework::proto::VarDesc::VarType
  optional VarType type = 2;
  // bool persistable is not needed for sending.
  // tensor info:
  optional Type data_type = 3;
  repeated int64 dims = 4;

  // lod details:
  optional int64 lod_level = 5;
  repeated LodData lod = 6;
  // selected_rows height, aka. original dim0
  optional int64 slr_height = 7;
  // tensor data
  optional bytes data = 8;
}
message HeterRequest {
  required int32 cmd = 1;
  optional int32 cur_batch = 2;
  repeated VariableMessage vars = 3;
};

message HeterResponse {
  // optional VariableMessage vars = 1;
  repeated VariableMessage vars = 1;
};

service HeterService { rpc service(HeterRequest) returns (HeterResponse); };
