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sklearn PCA
http://doc.okbase.net/u012162613/archive/120946.html 白化
http://scikit-learn.org/stable/modules/generated/sklearn.decomposition.PCA.html
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sklearn kmean k choose(肘部法)
http://www.cnblogs.com/wuchuanying/p/6264025.html
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模型暂存
http://blog.csdn.net/Dream_angel_Z/article/details/47175373