class_docstr: Encodes text to sequences and decodes sequences to text.
docstr: Size of token vocab.
docstr_tok: ["Size","of","token","vocab","."]
code: def vocab_size(self) -> int:
      """
      Size of token vocab.
      """
      pass
  
imports: import abc
  from abc import abstractmethod
  from typing import List
label_desc: Use image node_id 3 for calling the Tokenizer obj's underlying member method code with example usage: obj.vocab_size() without return types