code: def tearDown(self):
      del self.autocast_lists
      super().tearDown()
  
imports: import collections
  import unittest
  import torch
  from torch.testing._internal.common_utils import TestCase, run_tests, IS_WINDOWS, skipIfTorchDynamo
  from torch.testing._internal.autocast_test_lists import AutocastCPUTestLists
  from torch.utils._python_dispatch import TorchDispatchMode
label_desc: Use image node_id 2 for calling the TestAutocastCPU obj's underlying member method code with example usage: obj.tearDown() without return types