code: def n_vocab(self) -> int:
      return len(self.encoder)
  
file_path: glide-text2im/glide_text2im/tokenizer/bpe.py
imports: import gzip
  import json
  import os
  from functools import lru_cache
  from typing import List, Tuple
  import regex
label_desc: Use image node_id 2 for calling the Encoder obj's underlying member method code with example usage: obj.n_vocab() and returns: len