code: def test_instantiation_from_tokenizers_json_file(self):
      bert_tokenizer = Tokenizer(WordPiece(unk_token="[UNK]"))
      with tempfile.TemporaryDirectory() as tmpdirname:
          bert_tokenizer.save(
              os.path.join(tmpdirname, "tokenizer.json")
          )
          PreTrainedTokenizerFast(
              tokenizer_file=os.path.join(tmpdirname, "tokenizer.json")
          )
  
imports: import os
  import pickle
  import tempfile
  import unittest
  from typing import Callable, Optional
  import numpy
  from transformers import PreTrainedTokenizerFast
  from transformers import BatchEncoding, BertTokenizer, BertTokenizerFast, PreTrainedTokenizer, TensorType, TokenSpan, is_tokenizers_available
  from transformers.models.gpt2.tokenization_gpt2 import GPT2Tokenizer
  from transformers.testing_utils import CaptureStderr, require_flax, require_tf, require_tokenizers, require_torch, slow
label_desc: Use image node_id 18 for calling the TokenizerUtilsTest obj's underlying member method code with example usage: obj.test_instantiation_from_tokenizers_json_file() without return types