readme: 这是一个git lfs项目。
  
  没有改造数据前的模型性能：
  knowledge points - max length is 1566, min length is 3, ave length is 87.96, 95% quantile is 490.
  question and answer - max length is 303, min length is 8, ave length is 47.09, 95% quantile is 119.
  303精度为：2562/5232=48.97%
  
  