code: def setUp(self) -> None:
      ray.init()
  
file_path: ray/release/rllib_tests/checkpointing_tests/test_learner_group_checkpointing.py
imports: import gymnasium
  import itertools
  import numpy
  import tempfile
  import unittest
  import ray
  from ray.rllib.core.learner.scaling_config import LearnerGroupScalingConfig
  from ray.rllib.core.testing.utils import get_learner_group
  from ray.rllib.policy.sample_batch import SampleBatch
  from ray.rllib.utils.test_utils import check
label_desc: Use image node_id 1 for calling the TestLearnerGroupCheckpointing obj's underlying member method code with example usage: obj.setUp() without return types