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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 ~Tel://: Number data format, followed by telephone number. 　一家人的生命安全才是最重要的。最后便是诚心感谢大家，虽然更新少了，但是每天的打赏、推荐票、收藏却没有少。人到中年的马中奇，是一家广告公司的制作部经理。他已和搞发型设计的妻子简佳分居，二人正打算结束十多年的婚姻。十多年是个不短的年头，两口子已磨得只剩下没事儿拌嘴的份儿。简佳在发型公司遇到一个奇怪的男生，他戴着假发，却想请简佳设计发型。起初简佳以为他在玩酷，毫不犹豫就拒绝了。哪知这个男生一直等她到下班。他告诉简佳他从一本杂志上认识了她。简佳看出他有难言之隐。简佳后来知道这个男生患有绝症，他想请简佳专门为他设计发型，是因为他想有好看的头发，和他深爱的女孩照一张订婚照……Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.