weight added to bayes

http://read.pudn.com/downloads153/ebook/675295/bayes/%E5%9F%BA%E4%BA%8E%E5%B1%9E%E6%80%A7%E5%8A%A0%E6%9D%83%E7%9A%84%E6%9C%B4%E7%B4%A0%E8%B4%9D%E5%8F%B6%E6%96%AF%E5%88%86%E7%B1%BB%E7%AE%97%E6%B3%95.pdf