code: def tearDown(self):
      teardown_imports()
      gc.collect()
  
file_path: mmf/tests/configs/test_configs_for_keys.py
imports: import contextlib
  import gc
  import unittest
  import warnings
  from io import StringIO
  from mmf.common.registry import registry
  from mmf.utils.configuration import Configuration
  from mmf.utils.env import setup_imports, teardown_imports
  from tests.test_utils import dummy_args
label_desc: Use image node_id 2 for calling the TestConfigsForKeys obj's underlying member method code with example usage: obj.tearDown() without return types