code: def num_tokens(self):
      return self.num_image_tokens + self.num_text_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 6 for calling the SPTokenizer obj's underlying member method code with example usage: obj.num_tokens() and returns: unknown