class_docstr: Test the DDPOTrainer class.
class_docstr_tok: ["Test","the","DDPOTrainer","class","."]
code: def tearDown(self) -> None:
      gc.collect()
  
file_path: trl/tests/test_ddpo_trainer.py
imports: import gc
  import unittest
  import torch
  from trl import is_diffusers_available, is_peft_available
  from .testing_utils import require_diffusers
label_desc: Use image node_id 2 for calling the DDPOTrainerTester obj's underlying member method code with example usage: obj.tearDown() without return types