class_docstr: Base Vocabulary class.
  
  This class only needs a vocabulary dictionary without specifying the characters.
  
  Args:
      vocab (Dict): A dictionary of characters and their corresponding indices.
docstr: Map an token ID to a character.
docstr_tok: ["Map","an","token","ID","to","a","character","."]
code: def id_to_char(self, idx: int) -> str:
      """Map an token ID to a character."""
      return self._id_to_char[idx]
  
imports: from dataclasses import replace
  from typing import Dict
  from TTS.tts.configs.shared_configs import CharactersConfig
label_desc: Use image node_id 12 for calling the BaseVocabulary obj's underlying member method code with example usage: obj.id_to_char(idx) and returns: self