code: @Override
      protected double scoreImpl(List<Word> words1, List<Word> words2){
          double score = super.scoreImpl(words1, words2);
  
          score += (scalingFactor * commonPrefixLength() * (1.0 - score));
  
          return score;
      }
docs: 计算相似度分值
  @param words1 词列表1
  @param words2 词列表2
  @return 相似度分值