code: def test_save_ppo(self):
      for fw in framework_iterator():
          save_test("PPO", fw)
  
file_path: ray/rllib/algorithms/tests/test_algorithm_export_checkpoint.py
imports: import numpy
  import os
  import shutil
  import unittest
  import ray
  from ray.rllib.examples.env.multi_agent import MultiAgentCartPole
  from ray.rllib.policy.sample_batch import DEFAULT_POLICY_ID
  from ray.rllib.utils.framework import try_import_tf, try_import_torch
  from ray.rllib.utils.test_utils import framework_iterator
  from ray.tune.registry import get_trainable_cls
label_desc: Use image node_id 4 for calling the TestAlgorithmSave obj's underlying member method code with example usage: obj.test_save_ppo() without return types