text: Hello, you are an advanced researcher in Machine Learning. Below is the task which you can do single handedly. You need to incorporate i-2 perturbation training and generate the training loop . 
  i-2 perturbation is a technique used in adversarial training to improve the robustness of machine learning models against adversarial attacks. It involves generating two adversarial examples for each training example, one to be used in the forward pass and the other to be used in the backward pass. The idea is to introduce a different perturbation in each sample, which helps the model to learn to recognize the underlying pattern of the input, rather than relying on a specific set of features that may be vulnerable to adversarial attacks.
  
  Here is the data which is extracted  and the atatck which  you will use to generate FGSM samples. Incorporate both un final code. 
  
  Generate the final code snippet so as to improve robustness of the model. 
  
  
  Data Preparation for Training: 
  
  with ZipFile(args.train_data, 'r') as f:
      f.extractall('unzipped_data')
  data = torchvision.datasets.ImageFolder(root='unzipped_data', transform=transforms.ToTensor())
  images, labels = [], []
  for X, y in data:
      images.append(X)
      labels.append(torch.tensor(y))
  
  images = torch.stack(images)
  labels = torch.stack(labels)
  
  
  
  Attack: 
  
  
  
  
  preprocessing = dict(mean=[0.4901, 0.4617, 0.4061], std=[0.1977, 0.1956, 0.1947], axis=-3)
  fnet = fb.PyTorchModel(net, bounds=(0, 1), preprocessing=preprocessing, device='cpu')
  fgsm = fb.attacks.FGSM()
  
  
  
  _, fgs