class_docstr: Tests utilities helping with Checkpoint management.
class_docstr_tok: ["Tests","utilities","helping","with","Checkpoint","management","."]
code: def setUpClass(cls) -> None:
      ray.init()
  
imports: import os
  from pathlib import Path
  import tempfile
  import unittest
  import ray
  from ray.rllib.algorithms.algorithm import Algorithm
  from ray.rllib.algorithms.algorithm_config import AlgorithmConfig
  from ray.rllib.algorithms.dqn import DQNConfig
  from ray.rllib.algorithms.ppo import PPOConfig
  from ray.rllib.examples.env.multi_agent import MultiAgentCartPole
  from ray.rllib.policy.policy import Policy
  from ray.rllib.utils.checkpoints import get_checkpoint_info, convert_to_msgpack_checkpoint, convert_to_msgpack_policy_checkpoint
  from ray.rllib.utils.test_utils import check
  from ray import tune
label_desc: Use image node_id 1 for calling the TestCheckpointUtils obj's underlying member method code with example usage: obj.setUpClass(cls) without return types