docstr: Add additional special tokens to the dictionary.
docstr_tok: ["Add","additional","special","tokens","to","the","dictionary","."]
code: def add_additional_special_tokens(
      self, additional_special_tokens: List[str]
  ):
      """
      Add additional special tokens to the dictionary.
      """
      self.additional_special_tokens = additional_special_tokens
      self.hf_tokenizer.add_special_tokens(
          {"additional_special_tokens": additional_special_tokens}
      )
      for tok in self.additional_special_tokens:
          self.add_token(tok)
  
imports: import os
  import re
  from abc import ABC, abstractmethod, abstractproperty
  from collections import defaultdict
  from typing import List
  from parlai.core.dict import DictionaryAgent
  from parlai.core.opt import Opt
  from parlai.utils.io import PathManager
label_desc: Use image node_id 4 for calling the Gpt2DictionaryAgent obj's underlying member method code with example usage: obj.add_additional_special_tokens(additional_special_tokens) without return types