code: def forward(self, x):
      raise NotImplementedError
  
imports: import torch
  import logging
  import torch.nn
  import torch.nn.functional
  from torchvision import models
  from itertools import chain
  import numpy
  from collections import OrderedDict
label_desc: Use image node_id 2 for calling the BaseModel obj's underlying member method code with example usage: obj.forward(x) without return types