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Information Theory: I forget which publishing house it was. It is a very thin book and it is very good. There is a good talk about the measurement of information, the understanding of entropy and the Markov process (there is no such thing in the company now, I'll go back and find it and make it up). Mastering this knowledge, it is good for you to understand the cross entropy and relative entropy, which look similar but easy to confuse. At least you know why many machine learning algorithms like to use cross entropy as cost function ~服装设计师庆琳（金南珠 饰）这天举报毕业服装秀，应邀而来的模特远钧（韩宰锡 饰）迟到了，庆琳在无可奈何之际准备将高大英俊的男观众李政（张东健 饰）拉去当临时模特。幸好关键时刻远钧赶到，服装秀终于顺利举行，服装秀过后，庆琳和李政都产生了当模特的想法。李政原来是国内服装商神话集团老板李祥钧的长孙，父亲死后母亲带着他避居美国，母亲自小就告诫他要向爷爷和叔叔报仇，这次，李政正是回国复仇的。张杨的亲朋故交、同年师兄弟等纷纷上书，说从来就没有这样的事，大靖律法亦没有这项规定，而张杨也辩驳说，张家迁入桃花谷，发现那些乌龟后，他父兄已经下令不准惊扰，更遑论吃乌龟了。1. Projection and shadow setting method of objectsDon't rely solely on internal defense mechanisms