code: def setUpClass(cls):
      ray.init()
  
file_path: ray/rllib/algorithms/marwil/tests/test_marwil.py
imports: import numpy
  import os
  from pathlib import Path
  import unittest
  import ray
  import ray.rllib.algorithms.marwil
  from ray.rllib.algorithms.marwil.marwil_tf_policy import MARWILTF2Policy
  from ray.rllib.algorithms.marwil.marwil_torch_policy import MARWILTorchPolicy
  from ray.rllib.evaluation.postprocessing import compute_advantages
  from ray.rllib.offline import JsonReader
  from ray.rllib.utils.framework import try_import_tf, try_import_torch
  from ray.rllib.utils.test_utils import check, check_compute_single_action, check_train_results, framework_iterator
label_desc: Use image node_id 1 for calling the TestMARWIL obj's underlying member method code with example usage: obj.setUpClass(cls) without return types