code: def tearDownClass(cls):
      ray.shutdown()
  
file_path: ray/rllib_contrib/dt/tests/test_dt_model.py
imports: import unittest
  import gymnasium
  import numpy
  from rllib_dt.dt.dt_torch_model import DTTorchModel
  import ray
  from ray.rllib.policy.sample_batch import SampleBatch
  from ray.rllib.utils.framework import try_import_tf, try_import_torch
  from ray.rllib.utils.numpy import convert_to_numpy
  from ray.rllib.utils.torch_utils import convert_to_torch_tensor
label_desc: Use image node_id 2 for calling the TestDTModel obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types