code: def word_tokenize(word, remove=None):
      if remove is None:
          remove = [",", "?"]
      word = word.lower()
  
      for item in remove:
          word = word.replace(item, "")
      word = word.replace("'s", " 's")
  
      return word.strip()
  
imports: import os
  import re
  from collections import Counter
  from itertools import chain
  import torch
  from mmf.common.registry import registry
  from mmf.utils.file_io import PathManager
  from mmf.utils.general import get_absolute_path
label_desc: Use image node_id 4 for calling a global function with example usage: word_tokenize(word, remove) and returns: word