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https://www.cnblogs.com/TextEditor/p/5527124.html

http://www.codesnippet.info/Article/Index?ArticleId=00000038

http://www.jianshu.com/p/4140be00d4e3

GBDT算法

http://www.doc88.com/p-6941533630446.html

PA和OD矩陣

http://blog.sina.com.cn/s/blog_6827755d0101b4c1.html