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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.夸父好友大巫后羿大怒，举部落之力，铸射日弓，造射日箭，射杀东皇十子，东皇十子陨落其九，一子生还。“小王子（党卫军）”，由彭茂熙编导。01　少年の国"Bus and subway all-pass one-day ticket"SpeXial偉晉劇中飾演以搖滾樂作為人生志向，卻屢遭挫折的樂團主唱，吳心緹則是家中從事禮儀社的國樂空靈少女，2人因一場意外互換靈魂，為換回自己的靈魂，從互看不對盤到逐漸產生好感。此剧讲述了同卵双胞胎兄弟韩秀浩和韩江浩过着完全不一样生活的奇幻故事，是一部烦恼该如何守护他人人生的笑中带泪奇幻剧。