code: def __len__(self):
      return self.num_tokens
  
imports: import os
  from typing import Dict, List, Optional, Union
  import numpy
  import sentencepiece
  from transformers.tokenization_utils import PreTrainedTokenizer
  from transformers.tokenization_utils_base import BatchEncoding, EncodedInput
  from transformers.utils import PaddingStrategy, logging
label_desc: Use image node_id 9 for calling the TextTokenizer obj's underlying member method code with example usage: obj.__len__() and returns: self