code: def pre_tokenizer(self, pre_tokenizer: PreTokenizer):
      self._tokenizer.pre_tokenizer = pre_tokenizer
  
imports: from typing import Dict, List, Optional, Tuple, Union
  from tokenizers import AddedToken, EncodeInput, Encoding, InputSequence, Tokenizer
  from tokenizers.decoders import Decoder
  from tokenizers.models import Model
  from tokenizers.normalizers import Normalizer
  from tokenizers.pre_tokenizers import PreTokenizer
  from tokenizers.processors import PostProcessor
label_desc: Use image node_id 31 for calling the BaseTokenizer obj's underlying member method code with example usage: obj.pre_tokenizer(pre_tokenizer) without return types