参考：https://blog.csdn.net/han_xiaoyang/article/details/52665396
https://dnc1994.com/2016/04/rank-10-percent-in-first-kaggle-competition/
http://www.mux5.com/bk.php?s=xgb.dmatrix%E7%9A%84%E7%94%A8%E5%A4%84
原文：https://www.cnblogs.com/xxswkl/p/10806077.html