code: def src_graph(self):
      raise NotImplementedError
  
file_path: MMdnn/mmdnn/conversion/common/DataStructure/parser.py
imports: import numpy
  import mmdnn.conversion.common.IR.graph_pb2
  from mmdnn.conversion.common.IR.graph_pb2 import NodeDef, GraphDef, DataType
label_desc: Use image node_id 3 for calling the Parser obj's underlying member method code with example usage: obj.src_graph() without return types