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可笑我们这群井底之蛙，还在这水沟里争斗不休……周青放声大笑。　　天音跟随AYA来到剧团，她完全不知道等待自己的是怎样不可思议的命运…Left Aileron Left Arrow Left Arrow-幸运的是，在这个时候他有幸进入一个人眼中。2在原本的历史上，突厥就曾经一路南下，直逼渭水，唐太宗才不得已与颉利可汗在渭水便桥盟约……虽然后来大败突厥，一雪前耻，但依旧在青史之中留下了污点，这是尹旭所不能容忍的。For codes of the same length, theoretically, the further the coding distance between any two categories, the stronger the error correction capability. Therefore, when the code length is small, the theoretical optimal code can be calculated according to this principle. However, it is difficult to effectively determine the optimal code when the code length is slightly larger. In fact, this is an NP-hard problem. However, we usually do not need to obtain theoretical optimal codes, because non-optimal codes can often produce good enough classifiers in practice. On the other hand, it is not that the better the theoretical properties of coding, the better the classification performance, because the machine learning problem involves many factors, such as dismantling multiple classes into two "class subsets", and the difficulty of distinguishing the two class subsets formed by different dismantling methods is often different, that is, the difficulty of the two classification problems caused by them is different. Therefore, one theory has a good quality of error correction, but it leads to a difficult coding for the two-classification problem, which is worse than the other theory, but it leads to a simpler coding for the two-classification problem, and it is hard to say which is better or weaker in the final performance of the model.