code: def tearDown(self):
      super(TestApexCrit, self).tearDown()
      if self.old_module is not None:
          import sys
  
          sys.modules["apex"] = self.old_module
  
imports: import unittest
  from mock import Mock, MagicMock, create_autospec, patch
  import torch
  import torchbearer
  from torchbearer.bases import Metric, Callback, base_closure
  from torchbearer.metrics.primitives import CategoricalAccuracy
label_desc: Use image node_id 2 for calling the TestApexCrit obj's underlying member method code with example usage: obj.tearDown() without return types