code: def tearDown(self):
      super(_CloudTunerIntegrationTestBase, self).tearDown()
  
      # Delete the study used in the test, if present
      if self._study_id:
          service = vizier_client.create_or_load_study(
              _PROJECT_ID, _REGION, self._study_id, None
          )
          service.delete_study()
  
      tf.keras.backend.clear_session()
  
imports: import contextlib
  import io
  import multiprocessing
  import os
  import re
  import time
  import keras_tuner
  import tensorflow
  from tensorflow import keras
  from tensorflow_cloud import CloudTuner
  from tensorflow_cloud.tuner import vizier_client
label_desc: Use image node_id 4 for calling the _CloudTunerIntegrationTestBase obj's underlying member method code with example usage: obj.tearDown() without return types