code: def cleanup(self):
      if os.path.exists("./ptl_stateless_timer_check"):
          shutil.rmtree(
              "./ptl_stateless_timer_check", ignore_errors=True
          )
  
imports: import os
  import shutil
  import pytest
  import torch
  from omegaconf import OmegaConf
  from pytorch_lightning import Trainer
  from nemo.core import ModelPT
  from nemo.utils import logging
  from nemo.utils.exp_manager import CallbackParams, ExpManagerConfig, StatelessTimer, exp_manager
label_desc: Use image node_id 2 for calling the TestStatelessTimer obj's underlying member method code with example usage: obj.cleanup() without return types