text: //*****************************************************************************
  // Copyright 2017-2020 Intel Corporation
  //
  // 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 "ngraph/op/subtract.hpp"
  #include "ngraph/op/negative.hpp"
  
  using namespace std;
  using namespace ngraph;
  
  // ------------------------------- v0 ------------------------------------------
  
  constexpr NodeTypeInfo op::v0::Subtract::type_info;
  
  op::v0::Subtract::Subtract(const Output<Node>& arg0,
                             const Output<Node>& arg1,
                             const AutoBroadcastSpec& auto_broadcast)
      : BinaryElementwiseArithmetic(arg0, arg1, auto_broadcast)
  {
      constructor_validate_and_infer_types();
  }
  
  shared_ptr<Node> op::v0::Subtract::copy_with_new_args(const NodeVector& new_args) const
  {
      check_new_args_count(this, new_args);
      return make_shared<op::v0::Subtract>(new_args.at(0), new_args.at(1), this->get_autob());
  }
  
  void op::Subtract::generate_adjoints(autodiff::Adjoints& adjoints, const OutputVector& deltas)
  {
      if (get_autob().m_type != op::AutoBroadcastType::NONE)
      {
          throw ngraph_error("Autodiff not supported with auto broadcasting");
      }
  
      auto delta = deltas.at(0);
  
      auto x = input_value(0);
      auto y = input_value(1);
  
      adjoints.add_delta(x, delta);
      adjoints.add_delta(y, -delta);
  }
  
  shared_ptr<ngraph::Node> ngraph::operator-(const Output<Node> arg0, const Output<Node> arg1)
  {
      return make_shared<op::v0::Subtract>(arg0, arg1);
  }
  
  // ------------------------------- v1 ------------------------------------------
  
  constexpr NodeTypeInfo op::v1::Subtract::type_info;
  
  op::v1::Subtract::Subtract(const Output<Node>& arg0,
                             const Output<Node>& arg1,
                             const AutoBroadcastSpec& auto_broadcast)
      : BinaryElementwiseArithmetic(arg0, arg1, auto_broadcast)
  {
      constructor_validate_and_infer_types();
  }
  
  shared_ptr<Node> op::v1::Subtract::copy_with_new_args(const NodeVector& new_args) const
  {
      check_new_args_count(this, new_args);
      return make_shared<op::v1::Subtract>(new_args.at(0), new_args.at(1), this->get_autob());
  }
  
  void op::v1::Subtract::generate_adjoints(autodiff::Adjoints& adjoints, const OutputVector& deltas)
  {
      if (get_autob().m_type != op::AutoBroadcastType::NONE)
      {
          throw ngraph_error("Autodiff not supported with auto broadcasting");
      }
  
      auto delta = deltas.at(0);
  
      auto x = input_value(0);
      auto y = input_value(1);
  
      adjoints.add_delta(x, delta);
      adjoints.add_delta(y, -delta);
  }
  