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http://binhua.info/machinelearning/%E6%A2%AF%E5%BA%A6%E4%B8%8B%E9%99%8D%E6%B7%B1%E5%85%A5%E6%B5%85%E5%87%BAui http://www.tuicool.com/articles/ZbMBjm .net http://m.blog.csdn.net/article/details?id=5103

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