code: def teardown_process_group():
      """Ensures that the distributed process group gets closed before the next test runs."""
      yield
      if _distributed_is_initialized():
          torch.distributed.destroy_process_group()
  
imports: import os
  import sys
  import threading
  from typing import List
  from unittest.mock import Mock
  import lightning.fabric
  import pytest
  import torch.distributed
  from lightning.fabric.accelerators import XLAAccelerator
  from lightning.fabric.strategies.launchers.subprocess_script import _ChildProcessObserver
  from lightning.fabric.utilities.distributed import _distributed_is_initialized
label_desc: Use image node_id 3 for calling a global function with example usage: teardown_process_group() without return types