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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.This standard mainly stipulates the medical conditions of flight students.便是之前高凡想杀紫茄的时候，也没敢明着来，而是交代属下装作射秦霖。Why on earth do female reporters of the NPC and CPPCC fight so hard? Because resources are indeed very limited. Hundreds of reporters attended each press conference, but only 10 people finally got the chance to ask questions.东国少年“梵天”执行秘密任务，来到中原国，遇到海难失去部分记忆。梵天被腿疾少女“公良潸”所救。梵天为报答救命之恩，答应“虹引”师太的请求，带潸儿和镇观奇书，下山寻找书中记载的仙岛，医治潸儿的腿疾，途径环翠湾。中原武将“李茂”受太后之命，前往环翠湾寻找皇帝下落。众人历经险阻最终齐聚环翠湾，梵天终于恢复记忆，在旅途中偶然获得的几样秘宝。令他距离成为天下最具权势之人，仅一步之遥。But before the chickens lay eggs, the days were difficult again, so the poor could not help killing the chickens to eat. When there was only one chicken left, the poor thought, "There is no hope of getting rich. It is better to sell the chicken, beat a pot of wine, drink three cups, and have no worries about everything."