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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.他第一次觉得，拍马屁也是件很不容易的活计。该片通过“吉祥宝宝”成长故事中的一个个幽默、积极向上的小片段，巧妙地把东莞800多年的饮食文化融入到动画片内，塑造了一个活泼可爱、诚实善良、诙谐幽默的“吉祥宝宝”形象。故事以一个纯真可爱的小孩子的角度，挖掘日常生活中的奇闻趣事。　　《邪恶力量》（Supernatural）由美国WB电视台制作，讲述灵异超自然现象大多来自于美国的都市传说和民间传说。他自己都过不去自己心里那一关。159 Chinese were killed. There is a Chinese baby and a foreign baby.In fact, the most useful thing about the threshold is the discussion about the shooting speed. The most important thing is the assassin's assassination and Li Ang's various skills. The reason why Li Ang took the flying soldiers was also because of the theory of shooting speed, which led to the strength of Li Ang's mixed arms.