code: def get_tokens(s):
      if not s:
          return []
      return normalize_answer(s).split()
  
imports: import argparse
  import collections
  import json
  import numpy
  import os
  import re
  import string
  import sys
label_desc: Use image node_id 4 for calling a global function with example usage: get_tokens(s) and returns: normalize_answer, list