code: def __init__(self):
      super().__init__()
      self.backbone1 = BackboneModel1()
      self.backbone2 = BackboneModel2()
      self.fc3 = nn.Linear(10, 2)
  
imports: import sys
  import os
  import math
  import uuid
  import shutil
  import numpy
  import torch
  import torch.nn
  import torch.nn.functional
  from tensorboard.compat.proto.graph_pb2 import GraphDef
  from google.protobuf import text_format
  import unittest
  from unittest import TestCase, main
  from nni.common.graph_utils import build_module_graph, build_graph, TorchModuleGraph, TUPLE_UNPACK_KIND
label_desc: Use image node_id 1 to create a new BigModel object from inherited base classes: torch.nn with example: obj = BigModel()