code: def normalize_answer(s):
      """
      Lower text and remove punctuation, articles and extra whitespace.
      """
      re_art = re.compile(r"\b(a|an|the)\b")
      re_punc = re.compile(r'[!"#$%&()*+,-./:;<=>?@\[\]\\^`{|}~_\']')
  
      def remove_articles(text):
          return re_art.sub(" ", text)
  
      def white_space_fix(text):
          return " ".join(text.split())
  
      def remove_punc(text):
          return re_punc.sub(" ", text)  # convert punctuation to spaces
  
      def lower(text):
          return text.lower()
  
      return white_space_fix(remove_articles(remove_punc(lower(s))))
  
file_path: ParlAI/parlai/crowdsourcing/utils/acceptability.py
imports: import re
  from typing import Iterable, List
  from parlai.utils.safety import OffensiveStringMatcher
label_desc: Use image node_id 1 for calling a global function with example usage: normalize_answer(s) and returns: white_space_fix, re_art, str, re_punc, text