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十年前的一场残酷的细菌侵袭灭绝了斯堪的纳维亚的绝大多数人口，一对年轻兄妹开始了一段寻觅安全处所的旅途。兄妹二人唯一的向导是父亲的日记本，里面记录了细菌与新世界的危险。他们加入其他年轻幸存者的行列，开始了险象环生的跨境之行。面对致命灾难，这帮人必须迅速意识到，最大的危险并非来自外界，而是来自内部。Spirit = Physical Strength * 0.3 + Magic * 0.7 + Endurance * 0.2 + Strength * 0.4 + Agility * 0 (Agility does not add Spirit)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 ~2017-02-01 14:59:50First of all, the 10,000-hour exercise must be targeted, with feedback and correction, but it will become mechanical repetition. The seeds sown did not grow into towering trees, but only got a pile of weeds.