code: def type(self):
      return self.layer.op
  
imports: import mmdnn.conversion.common.IR.graph_pb2
  from mmdnn.conversion.common.utils import *
  from mmdnn.conversion.common.IR.graph_pb2 import TensorShape, AttrValue
  from mmdnn.conversion.common.DataStructure.graph import Graph, GraphNode
label_desc: Use image node_id 4 for calling the IRGraphNode obj's underlying member method code with example usage: obj.type() and returns: self