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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.越国之前有六七万军队北上关中，加上汉军降卒和关中新近招募的士兵，总兵力已经达到了十万。青木几乎咬碎一嘴钢牙。Matching conditions are divided into basic matching conditions and extended matching conditionsDelivery, or distribution, includes the parent View passing events to the child View (event distribution process) and the child View passing events to the parent View (event consumption process).赵大人怎么看也要50岁了，因此严嵩至少也要70岁了，就算没病没灾的，貌似也没几年可以蹦跶了，这种时候，谁敢上您的船，把这段父子佳话传承下去啊。