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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.乾隆年间，因当时的墨品质量低劣，书写的字迹偶遇潮湿便不能持久，致使往来于京城和前方战场的军机战报经常字迹模糊不清，导致金川之战大败，乾隆震怒陈启准备好好纠正一下吕馨的观念，让她知道其实真的不必这样拼命。At present, Cao Zaixian has issued a statement, made a public apology and quit all the TV plays he is playing.听他这么分派，众人既兴奋又紧张。年初的《亲亲我好妈》由不被看好绝地反弹，不少网民大赞该剧内容够贴地，道尽一众港妈心声，而这套剧亦准备开拍续集啦。