code: def get_tokens(s):
      if not s:
          return []
      return normalize_answer(s).split()
  
imports: import collections
  import math
  import re
  import string
  from dataclasses import dataclass
  from typing import List, Dict
  from transformers.models.bert.tokenization_bert import BasicTokenizer
  from jiant.utils.display import maybe_tqdm
label_desc: Use image node_id 15 for calling a global function with example usage: get_tokens(s) and returns: normalize_answer, list