code: def clear_test_dir(self):
      for f in os.listdir(str(self.TEST_DIR)):
          os.remove(str(self.TEST_DIR) + "/" + f)
      assert len(os.listdir(str(self.TEST_DIR))) == 0
  
imports: import json
  import os
  import pytest
  import torch
  from allennlp.common import cached_transformers
  from allennlp.common.checks import ConfigurationError
  from allennlp.common.testing import AllenNlpTestCase
  from transformers import AutoConfig, AutoModel
label_desc: Use image node_id 4 for calling the TestCachedTransformers obj's underlying member method code with example usage: obj.clear_test_dir() without return types