text: """
   Copyright (C) 2018-2020 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.
  """
  import numpy as np
  
  from extensions.ops.elementwise import Add, Mul
  from mo.front.common.replacement import FrontReplacementOp
  from mo.graph.graph import Node, Graph
  from mo.ops.const import Const
  
  
  class Sub(FrontReplacementOp):
      op = "Sub"
      enabled = True
  
      def replace_op(self, graph: Graph, node: Node):
  
          # Add new nodes
          const_dtype = np.float32
          if node.has_valid('data_type'):
              const_dtype = node.data_type
          const = Const(graph, dict(value=np.array(-1, dtype=const_dtype))).create_node()
          negate = Mul(graph, {'name': node.name + '/negate_'}).create_node()
          add = Add(graph, {'name': node.name + '/add_'}).create_node()
  
          # Connect nodes
          node.in_port(1).get_connection().set_destination(negate.in_port(0))
          const.out_port(0).connect(negate.in_port(1))
          node.in_port(0).get_connection().set_destination(add.in_port(1))
          negate.out_port(0).connect(add.in_port(0))
  
          # The "explicit" version of the return value is: [(out_node.id, 0)])
          return [add.id]
  