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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 ~泥鳅舅母被戳中心病，气得脸通红。Just look at my legs.Demo Xia: I downloaded all the popular frameworks at present. I ran for the examples in different frames and looked at the results. I just thought it was good. Then I thought, well, in-depth learning is just like that. It's not too difficult. This kind of person, I met a lot during the interview, many students or just changed careers came up to talk about a demo, handwritten number recognition, CIFAR10 data image classification and so on, but you asked him how the specific process of handwritten number recognition was realized? Is the effect now good and can it be optimized? Why should the activation function choose this, can it choose another? Can you explain the principle of CNN briefly? I'm overwhelmed.沙林为印度皇帝之子，他喜欢上高级妓女安卡丽，皇帝不满意，决定拆散他们，沙林反抗到底，最后与父开战而战败，皇帝判决他死刑，但容许她们死前在一起，安卡丽为救沙林一命，决定离开她的挚爱。但是这悲呛之中，又有一种无法用言语来表达的壮烈。