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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.天气变化对行军作战的影响不言而喻。4. When ships in sight are approaching each other and, for any reason, any ship is unable to understand the intentions or actions of another ship or suspects whether the other ship is taking sufficient actions to avoid collision, the suspicious ship shall immediately sound at least five short and urgent horns with its whistle to express such suspicion. The sound signal can be supplemented with at least five short and sharp flashes.电视剧《复合大师》脱胎于电影《分手大师》，由贾乃亮、王晓晨领衔的复合者联盟，与代乐乐率领的分手者阵营高能PK，合作竞争共同解决人类情感难题，讲述关于人世真情的悲喜故事。Ghost Medicine 5三流漫画家大暖男VS一流游戏主播小哥哥 合租成为室友嬉笑怒骂建立新型兄弟情 奈何拜金房东小姐姐 脑洞逆天爆笑误会连连 小姐姐我们的关系真的不是你想的那样!咬着牙，认真写了起来。