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/log.hpp"
  #include "ngraph/op/divide.hpp"
  
  using namespace std;
  using namespace ngraph;
  
  constexpr NodeTypeInfo op::Log::type_info;
  
  op::Log::Log(const Output<Node>& arg)
      : UnaryElementwiseArithmetic(arg)
  {
      constructor_validate_and_infer_types();
  }
  
  bool ngraph::op::v0::Log::visit_attributes(AttributeVisitor& visitor)
  {
      return true;
  }
  
  shared_ptr<Node> op::Log::copy_with_new_args(const NodeVector& new_args) const
  {
      check_new_args_count(this, new_args);
      return make_shared<Log>(new_args.at(0));
  }
  
  void op::Log::generate_adjoints(autodiff::Adjoints& adjoints, const OutputVector& deltas)
  {
      auto delta = deltas.at(0);
  
      auto x = input_value(0);
  
      adjoints.add_delta(x, delta / x);
  }
  