code: def to_serializable(self):
      return {
          "token2id": self._token2id,
          "add_unk": self._add_unk,
          "unk_token": self._unk_token,
      }
  
imports: from typing import Dict
label_desc: Use image node_id 3 for calling the Vocabulary obj's underlying member method code with example usage: obj.to_serializable() and returns: dict