sklearn——回归评估指标
sklearn中文文档：http://sklearn.apachecn.org/#/
https://www.cnblogs.com/nolonely/p/7009001.html
https://www.cnblogs.com/zhubinwang/p/5170087.html
调参：https://www.cnblogs.com/pinard/p/6143927.html
GBR优缺点：
http://www.cnblogs.com/pinard/p/6140514.html
原理：
https://blog.csdn.net/w28971023/article/details/8240756
https://blog.csdn.net/LegenDavid/article/details/78904353
