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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 ~The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu1. Filter gateway protection他微笑道：我已经在信里封了银票，便是捐给医学院的。王氏家族经营五星级酒店集团，酒店风云亦因此而起。酒店集团话事人王玉廷（刘丹饰）有三个儿子，长子启业（蔡子健饰）优柔寡断，个性懦弱内敛，常受妻子叶茱莉（杨婉仪饰）及舅父郑永发（姜大伟饰）摆布；次子启志（莫家尧饰）好大喜功，其心根本不在酒店，爱搞娱乐事业却自视过高，常被人骗又不自知，从没把兄长放在眼里。三子启杰（吴卓羲饰）反叛暴躁，敌视父亲和两位异母兄长，跟家人