code: def _convert_identity_operation(
      self, source_node, start_idx=0, end_idx=None, new_op=None
  ):
      IR_node = self.IR_graph.node.add()
      DarknetParser._copy_and_reop(source_node, IR_node, new_op)
      self._convert_inedge(source_node, IR_node, start_idx, end_idx)
      return IR_node
  
imports: import os
  import numpy
  from mmdnn.conversion.common.utils import *
  from mmdnn.conversion.darknet.prototxt import *
  from mmdnn.conversion.darknet.darknet_utils import *
  from mmdnn.conversion.darknet.darknet_graph import DarknetGraph
  import mmdnn.conversion.common.IR.graph_pb2
  from mmdnn.conversion.common.DataStructure.parser import Parser
  from mmdnn.conversion.common.IR.graph_pb2 import NodeDef, GraphDef, DataType
label_desc: Use image node_id 6 for calling the DarknetParser obj's underlying member method code with example usage: obj._convert_identity_operation(source_node, start_idx, end_idx, new_op) and returns: IR_node