code: protected static double computeScore(LinkedList<double[]> scoreList, int tag)
      {
          double score = 0;
          for (double[] w : scoreList)
          {
              score += w[tag];
          }
          return score;
      }
docs: 给一系列特征函数结合tag打分
  
  @param scoreList
  @param tag
  @return