https://blog.wongcw.com/2019/08/07/%e6%94%af%e4%bb%98%e5%af%b6%e5%9c%a8ai-%e6%95%b8%e6%93%9a%e6%8c%96%e6%8e%98%e9%a0%82%e8%b3%bdkdd-cup-2019-%e5%a5%aa%e5%86%a0/