code: def tearDownClass(cls):
      ray.shutdown()
  
file_path: ray/rllib/algorithms/dqn/tests/test_repro_dqn.py
imports: import unittest
  import os
  import ray
  from ray.tune import register_env
  import ray.rllib.algorithms.dqn
  from ray.rllib.examples.env.deterministic_envs import create_cartpole_deterministic
  from ray.rllib.utils.test_utils import check_reproducibilty
label_desc: Use image node_id 2 for calling the TestReproDQN obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types