code: def tearDownClass(cls) -> None:
      ray.shutdown()
  
file_path: ray/rllib_contrib/maddpg/tests/test_maddpg.py
imports: import unittest
  import rllib_maddpg.maddpg.maddpg
  import ray
  from ray.rllib.examples.env.two_step_game import TwoStepGame
  from ray.rllib.policy.policy import PolicySpec
  from ray.rllib.utils.test_utils import check_train_results, framework_iterator
label_desc: Use image node_id 2 for calling the TestMADDPG obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types