code: def get_rust_tokenizer(self, **kwargs):
      kwargs.update(self.special_tokens_map)
      return GPT2TokenizerFast.from_pretrained(
          self.tmpdirname, **kwargs
      )
  
imports: import json
  import os
  import unittest
  from transformers import AutoTokenizer, GPT2Tokenizer, GPT2TokenizerFast
  from transformers.models.gpt2.tokenization_gpt2 import VOCAB_FILES_NAMES
  from transformers.testing_utils import require_tokenizers
  from ...test_tokenization_common import TokenizerTesterMixin
label_desc: Use image node_id 3 for calling the GPT2TokenizationTest obj's underlying member method code with example usage: obj.get_rust_tokenizer() and returns: GPT2TokenizerFast