Last updated 4 years ago
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集成思想主要有四类
committees
boosting
space split
mixture models，例：mixtures of Linear regression，mixtures of logistic models 和mixtures of experts
通过公式：p(t∣x)=∑k=1Kπk(x)pk(t∣x)p(t|x) = \sum_{k=1}^K \pi_k(x) p_k(t|x)p(t∣x)=∑k=1Kπk(x)pk(t∣x) 比如：f(x)=∑k=1Kevkx∑j=1Kevjx11+ewkxf(x) = \sum_{k=1}^K \frac {e^{v_k x}}{\sum_{j=1}^K e^{v_j x}} \frac {1}{1+e^{w_k x}}f(x)=∑k=1K∑j=1Kevjxevkx1+ewkx1, 然后用EM求解。