code: def tearDown(self):
      super().tearDown()
      if self._model_dir:
          tf.io.gfile.rmtree(self._model_dir)
      self._model_dir = None
  
imports: import os
  from absl.testing import parameterized
  import tensorflow
  from tensorflow import estimator
  import tensorflow_ranking
  from google.protobuf import text_format
  from tensorflow_ranking.extension import pipeline
  from tensorflow_serving.apis import input_pb2
label_desc: Use image node_id 2 for calling the RankingPipelineIntegrationTest obj's underlying member method code with example usage: obj.tearDown() without return types