/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.

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/framework/op_registry.h>

#include <vector>

namespace paddle {
namespace framework {

std::shared_ptr<OperatorBase> OpRegistry::CreateOp(const std::string& type,
                                                   const VarNameMap& inputs,
                                                   const VarNameMap& outputs,
                                                   AttributeMap attrs) {
  auto it = op_info_map().find(type);
  PADDLE_ENFORCE(it != op_info_map().end(),
                 "Operator '%s' has not been registered.", type);
  it->second.checker_->Check(attrs);
  auto op = it->second.creator_(type, inputs, outputs, attrs);
  return std::shared_ptr<OperatorBase>(op);
}

std::shared_ptr<OperatorBase> OpRegistry::CreateOp(const OpDesc& op_desc) {
  VarNameMap inputs = ConvertOpDescVarsToVarNameMap(op_desc.inputs());
  VarNameMap outputs = ConvertOpDescVarsToVarNameMap(op_desc.outputs());
  AttributeMap attrs;
  for (auto& attr : op_desc.attrs()) {
    attrs[attr.name()] = GetAttrValue(attr);
  }

  return CreateOp(op_desc.type(), inputs, outputs, attrs);
}

OperatorBase::VarNameMap OpRegistry::ConvertOpDescVarsToVarNameMap(
    const google::protobuf::RepeatedPtrField<OpDesc::Var>& op_desc_vars) {
  VarNameMap ret_val;
  for (auto& var : op_desc_vars) {
    auto& var_names = ret_val[var.parameter()];
    auto& var_names_in_proto = var.arguments();
    var_names.reserve(static_cast<size_t>(var_names_in_proto.size()));
    std::copy(var_names_in_proto.begin(), var_names_in_proto.end(),
              std::back_inserter(var_names));
  }
  return ret_val;
}

std::shared_ptr<OperatorBase> OpRegistry::CreateGradOp(const OperatorBase& op) {
  PADDLE_ENFORCE(!op.IsNetOp(), "Use framework::Backward to get backward ops");
  std::shared_ptr<OperatorBase> grad_op(BuildGradOp(&op));
  return grad_op;
}

}  // namespace framework
}  // namespace paddle