code: def tearDown(self):
      if self.device is not None:
          os.environ["CUDA_VISIBLE_DEVICES"] = self.device
      else:
          del os.environ["CUDA_VISIBLE_DEVICES"]
  
file_path: MONAI/tests/test_bundle_trt_export.py
imports: from __future__ import annotations
  import json
  import os
  import tempfile
  import unittest
  from parameterized import parameterized
  from monai.bundle import ConfigParser
  from monai.data import load_net_with_metadata
  from monai.networks import save_state
  from monai.utils import optional_import
  from tests.utils import command_line_tests, skip_if_no_cuda, skip_if_quick, skip_if_windows
label_desc: Use image node_id 2 for calling the TestTRTExport obj's underlying member method code with example usage: obj.tearDown() without return types