http://wenku.baidu.com/link?url=6w45CDYuzPo1G2m6IPfKcZb6d-3HQNPl0AG0DuclXyEUm5hqEJ1MZ2eAcIyiGSwA3ePLurZx5dH5lP8RCSgxhwlYX0bWePsRhA0j6F-FMLe
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高斯过程回归方法综述