code: def rename_UNKNOWN(self, source_node):
      print(
          "Warning: MXNet Parser has not supported operator %s with name %s."
          % (source_node.type, source_node.name)
      )
      if source_node.type == "null" and source_node.name != "label":
          print(
              "Warning: convert the null operator with name [%s] into input layer."
              % source_node.name
          )
          IR_node = self.IR_graph.node.add()
  
          # name, op
          self._copy_and_reop(source_node, IR_node, "DataInput")
  
          # input edge
          self.convert_inedge(source_node, IR_node)
  
          self.set_output_shape(source_node, IR_node)
  
      else:
          raise NotImplementedError()
  
imports: import os
  import sys
  import math
  import mxnet
  import numpy
  from mmdnn.conversion.mxnet.mxnet_graph import MXNetGraph
  import mmdnn.conversion.common.IR.graph_pb2
  from mmdnn.conversion.common.IR.graph_pb2 import NodeDef, GraphDef, DataType
  from mmdnn.conversion.common.DataStructure.parser import Parser
  from mmdnn.conversion.common.utils import *
label_desc: Use image node_id 17 for calling the MXNetParser obj's underlying member method code with example usage: obj.rename_UNKNOWN(source_node) without return types