code: def tearDowClass(cls) -> None:
      ray.shutdown()
  
file_path: ray/rllib/tests/test_algorithm_save_load_checkpoint_learner.py
imports: import tempfile
  import unittest
  import ray
  from ray.rllib.algorithms.algorithm_config import AlgorithmConfig
  from ray.rllib.utils.test_utils import check, framework_iterator
  from ray.rllib.algorithms.ppo import PPOConfig
  from ray.rllib.policy.sample_batch import DEFAULT_POLICY_ID
  from ray.rllib.utils.metrics.learner_info import LEARNER_INFO
label_desc: Use image node_id 2 for calling the TestAlgorithmWithLearnerSaveAndRestore obj's underlying member method code with example usage: obj.tearDowClass(cls) without return types