class_docstr: Test case which handles TPU hard placement.
class_docstr_tok: ["Test","case","which","handles","TPU","hard","placement","."]
code: def tearDown(self):
      super().tearDown()
      if self.ENTER_PRIMARY_DEVICE:
          self._device.__exit__(*sys.exc_info())
          del self._device
  
imports: import functools
  import inspect
  import itertools
  import os
  import sys
  import threading
  import types
  from typing import Sequence, Tuple, Type, TypeVar
  from absl.testing import parameterized
  import tensorflow
label_desc: Use image node_id 2 for calling the TestCase obj's underlying member method code with example usage: obj.tearDown() without return types