code: def forward(self, x):
      x = x.view(-1, 4)
      logit_output = self.fc(x)
      logit_output = logit_output.view(-1, 4, 256)
  
      return logit_output
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import logging
  import unittest
  import numpy
  import torch.nn
  import torch.optim
  from art.estimators.classification.pytorch import PyTorchClassifier
  from art.defences.preprocessor import PixelDefend
  from art.utils import load_mnist
  from tests.utils import master_seed
label_desc: Use image node_id 2 for calling the Model obj's underlying member method code with example usage: obj.forward(x) and returns: logit_output