code: def test_gpt2_bpe_dropout(self):
      self._test_bpe_dropout(dict_tokenizer="gpt2")
  
imports: from parlai.core.build_data import modelzoo_path
  from parlai.core.dict import find_ngrams
  from parlai.core.params import ParlaiParser
  from parlai.core.dict import DictionaryAgent, TokenizationMode
  from parlai.core.opt import Opt
  import parlai.scripts.build_dict
  from parlai.utils.io import PathManager
  import parlai.utils.testing
  import os
  import shutil
  import unittest
  import pytest
label_desc: Use image node_id 2 for calling the TestBpeDropout obj's underlying member method code with example usage: obj.test_gpt2_bpe_dropout() without return types