code: def add_special_token(tokenizer):
      tokenizer.add_tokens(special_token_list, special_tokens=True)
      if tokenizer.pad_token is None:
          # Issue: GPT models don't have a pad token, which we use to
          # modify labels for the loss.
          tokenizer.add_special_tokens({"pad_token": "<PAD>"})
      return tokenizer
  
file_path: deepspeedexamples/applications/DeepSpeed-VisualChat/utils/data/DST.py
imports: from typing import Iterable
  import random
  import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: add_special_token(tokenizer) and returns: tokenizer