code: def _words_by_distinctiveness_score(vocab, topic_word_distrib, doc_topic_distrib, doc_lengths, n=None,
                                      least_to_most=False):
      
      p_t = get_marginal_topic_distrib(doc_topic_distrib, doc_lengths)
      distinct = get_word_distinctiveness(topic_word_distrib, p_t)
  
      return _words_by_score(vocab, distinct, least_to_most=least_to_most, n=n)
docs: Return words in `vocab` ordered by distinctiveness score.