code: def tearDown(self):
      super().tearDown()
      os.environ.clear()
  
imports: import os
  from unittest import mock
  import numpy
  import pytest
  import tensorflow
  from keras import backend
  from keras import testing
  from keras.backend import distribution_lib
  from keras.distribution import distribution_lib
label_desc: Use image node_id 1 for calling the MultiProcessInitializeTest obj's underlying member method code with example usage: obj.tearDown() without return types