code: def tearDown(self) -> None:
      from bigdl.orca import stop_orca_context
  
      stop_orca_context()
  
imports: import tensorflow
  import numpy
  from unittest import TestCase
  from bigdl.orca.automl.auto_estimator import AutoEstimator
  import pytest
label_desc: Use image node_id 2 for calling the TestTFKerasAutoEstimator obj's underlying member method code with example usage: obj.tearDown() without return types