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Generative& Discriminative model
Given (x1,y1),(x2,y2),....,(xn,yn); Discriminative 就是model p(y|x), 给定每个x,其对应y的分布 Generative 就是model p(x,y) = p(y)p(x|y), 如果y为class的话,就相当于 我们是model (x,y)的产生过程,先根据P(y)选择一个class,再从这个class的分布p(x|y)原创 2013-09-04 08:17:45 · 846 阅读 · 0 评论 -
很多Machine Learning的问题都可以归结为regression
General的regression,我们看做,given x1 vector, x2 vector,..., xn vector, 来求fit 这个data sample 最合适的function or 分布, 首先可以用polynomial的分布,可能这个分布无论如何tuning 参数weight,也不能很好的fit these data, 然后可以考虑使用其他的分布形式,但是最原创 2013-09-04 08:22:39 · 733 阅读 · 0 评论 -
Deduction & Induction
ref:http://www.psych.utah.edu/gordon/Classes/Psy4905Docs/PsychHistory/Cards/Logic.html Logical arguments are usually classified as either 'deductive' or 'inductive'. Deduction: In the process of ded转载 2013-09-04 09:48:23 · 2113 阅读 · 0 评论 -
ML1.6 KNN
this is a discriminative model, model p(y|x_n+1), i.e we don't care about the prior on our predictive independent variable x_n+1, 认为它没有prior knowledge. depending on the norm, find the k nearest原创 2013-09-16 22:53:42 · 856 阅读 · 0 评论