code: def setUp(self):
      ray.init()
  
file_path: ray/rllib/offline/tests/test_feature_importance.py
imports: import unittest
  import ray
  from ray.rllib.algorithms.marwil import MARWILConfig
  from ray.rllib.execution import synchronous_parallel_sample
  from ray.rllib.offline.feature_importance import FeatureImportance
label_desc: Use image node_id 1 for calling the TestFeatureImportance obj's underlying member method code with example usage: obj.setUp() without return types