code: def tearDown(self):
      ray.shutdown()
  
imports: import threading
  import unittest
  import ray
  import ray.train
  from ray.train import CheckpointConfig
  from ray.tune import register_trainable
  from ray.tune.experiment import Experiment, _convert_to_experiment_list
  from ray.tune.error import TuneError
  from ray.tune.utils import diagnose_serialization
label_desc: Use image node_id 1 for calling the ExperimentTest obj's underlying member method code with example usage: obj.tearDown() without return types