code: def tearDownClass(cls):
      ray.shutdown()
  
file_path: ray/python/ray/rllib/tests/test_perf.py
imports: import gymnasium
  import time
  import unittest
  import ray
  from ray.rllib.algorithms.algorithm_config import AlgorithmConfig
  from ray.rllib.evaluation.rollout_worker import RolloutWorker
  from ray.rllib.evaluation.tests.test_rollout_worker import MockPolicy
label_desc: Use image node_id 2 for calling the TestPerf obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types