code: def tearDown(self) -> None:
      if self._var is None:
          os.environ.pop("TORCH_EXTENSIONS_DIR", None)
      else:
          os.environ["TORCH_EXTENSIONS_DIR"] = f"{self._var}"
      shutil.rmtree(self.tempdir)
  
file_path: MONAI/tests/test_gmm.py
imports: from __future__ import annotations
  import os
  import shutil
  import tempfile
  import unittest
  import numpy
  import torch
  from parameterized import parameterized
  from monai._extensions import load_module
  from monai.networks.layers import GaussianMixtureModel
  from tests.utils import skip_if_darwin, skip_if_no_cuda, skip_if_quick, skip_if_windows
label_desc: Use image node_id 2 for calling the GMMTestCase obj's underlying member method code with example usage: obj.tearDown() without return types