code: def rename_Sub(self, source_node):
      self._convert_identity_operation(source_node)
  
imports: import os
  import numpy
  from six.moves import xrange
  import cntk
  from mmdnn.conversion.cntk.cntk_graph import CntkGraph
  import mmdnn.conversion.common.IR.graph_pb2
  from mmdnn.conversion.common.IR.graph_pb2 import NodeDef, GraphDef, DataType
  from mmdnn.conversion.common.utils import *
  from mmdnn.conversion.common.DataStructure.parser import Parser
label_desc: Use image node_id 17 for calling the CntkParser obj's underlying member method code with example usage: obj.rename_Sub(source_node) without return types