code: def __getitem__(self, item):
      if self.transform:
          item = self.transform(item)
      return item
  
imports: import os
  import pickle
  import warnings
  from unittest.mock import patch
  import numpy
  import pytest
  from torch.utils.data import Dataset
  from baal.active import ActiveLearningDataset, heuristics
  from baal.active.active_loop import ActiveLearningLoop
label_desc: Use image node_id 3 for calling the MyDataset obj's underlying member method code with example usage: obj.__getitem__(item) and returns: item