code: def setUp(self):
      self.dataset = ActiveLearningDataset(
          MyDataset(), make_unlabelled=lambda x: (x[0], -1)
      )
  
imports: import pickle
  import unittest
  import unittest.mock
  import warnings
  import datasets
  import numpy
  import pytest
  import torch.utils.data
  from torchvision.transforms import Lambda
  from baal.active import ActiveLearningDataset
label_desc: Use image node_id 1 for calling the ActiveDatasetTest obj's underlying member method code with example usage: obj.setUp() without return types