code: def rename_cast(self, source_node):
      IR_node = self._convert_identity_operation(
          source_node, new_op="Cast"
      )
  
      # dtype
      IR_node.attr["dtype"].type = MXNetParser.dtype_map[
          source_node.get_attr("dtype")
      ]
  
      # output shape
      self.set_output_shape(source_node, IR_node)
  
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 36 for calling the MXNetParser obj's underlying member method code with example usage: obj.rename_cast(source_node) without return types