code: def tearDown(self):
      self.tmp_dir.cleanup()
  
file_path: texar/tests/data/tokenizers/gpt2_tokenizer_test.py
imports: import json
  import os
  import pickle
  import tempfile
  import tensorflow
  from texar.tf.data.tokenizers.gpt2_tokenizer import GPT2Tokenizer
  from texar.tf.utils.test import pretrained_test
label_desc: Use image node_id 2 for calling the GPT2TokenizerTest obj's underlying member method code with example usage: obj.tearDown() without return types