//   Copyright (c) 2020 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.

#include "paddle/fluid/operators/push_dense_op.h"
#include <string>

namespace paddle {
namespace operators {

class PushDenseOp : public framework::OperatorWithKernel {
 public:
  using framework::OperatorWithKernel::OperatorWithKernel;
  void InferShape(framework::InferShapeContext* ctx) const override {
    PADDLE_ENFORCE_GE(ctx->Inputs("Ids").size(), 1UL,
                      platform::errors::InvalidArgument(
                          "Input(Ids) of PushDenseOp can not be null."));
  }

 protected:
  framework::OpKernelType GetExpectedKernelType(
      const framework::ExecutionContext& ctx) const override {
    return framework::OpKernelType(framework::proto::VarType::FP32,
                                   ctx.device_context());
  }
};

class PushDenseOpMaker : public framework::OpProtoAndCheckerMaker {
 public:
  void Make() override {
    AddInput("Ids", "the tensor to get batch size").AsDuplicable();
    AddAttr<int>("TableId", "(int, the table id of this embedding")
        .SetDefault(-1);
    AddAttr<float>("ScaleDataNorm", "(float, scale data norm gradient")
        .SetDefault(-1.0f);
    AddAttr<std::vector<std::string>>("InputNames", "(vector, slot names")
        .SetDefault(std::vector<std::string>());
    AddComment(R"DOC(
Push Dense Operator.

push dense gradients to PSLib's Parameter Server.

The input gradients is all dense gradient tensors in a table.

)DOC");
  }
};

DECLARE_NO_NEED_BUFFER_VARS_INFERER(PushDenseNoNeedBufferVarsInferer, "Ids");

}  // namespace operators
}  // namespace paddle

namespace ops = paddle::operators;
REGISTER_OPERATOR(
    push_dense, ops::PushDenseOp, ops::PushDenseOpMaker,
    paddle::framework::EmptyGradOpMaker<paddle::framework::OpDesc>,
    paddle::framework::EmptyGradOpMaker<paddle::imperative::OpBase>,
    ops::PushDenseNoNeedBufferVarsInferer);
REGISTER_OP_CPU_KERNEL(push_dense, ops::PushDenseCPUKernel<float>)
