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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.秦末，陈胜大泽乡起兵反秦，派武臣为将军，张耳、陈余为校尉平定赵地。今日尹旭提及如何进攻巴蜀。那声音很轻灵，响声也很细微，不像是人发出的，似乎是体型较小的兽类发出的。影片讲述了小古董店老板许愿本过着平常日子，意外卷入了一场关于国宝《清明上河图》的事件中，并得知自己与这件事有着紧密关系。在与反派争分夺秒的调查中，许愿揭开层层线索寻找到关键证据，最终成功守护了国宝的故事。CBS续订剧集FBI第二季《联邦调查局》顾名思义就是讲述美国著名的执法部门FBI，而该剧背景在纽 约的办公室。Stephen thought he was not going to overindulge in sex, but what he had just seen really surprised him and was somewhat tempted. But he would not take that step because he didn't want to add another injury to Stark.