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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.其二，取杭州之局怕是部署已久，摸透了胡宗宪急于求胜的心态，逼大军压至宁波，这边再暗度陈仓。Your database file is damaged and can only be recovered from the file you backed up before.知县又不是皇上。彭越献城投降，刘邦大军已经进城了。[Truth] On the afternoon of that day, surging news released "Talented Women from Peking University Journalism Department Return to Their Hometown to Start Businesses and Deliver Express Party: It is a diploma from a junior college to a junior college. It points out that some netizens questioned the report that the School of Journalism and Communication of Peking University was established in 2001. How did Xu Lu enter the school in 2000? In addition, some netizens released a list of students admitted to Peking University in 2000, none of whom was named Xu Lu. The reporter called Xu Lu herself about these doubts. She said: "I graduated from a specialized college in Beijing in the first half of 2003, then took the adult education examination, and entered the School of Journalism and Communication of Peking University in February 2004 to study for a bachelor's degree in journalism. Therefore, I was promoted from a specialized college to a bachelor's degree in adult education." Xu Lu said that she was not admitted to Peking University in 2000 as written in the report. In an interview, she also stressed to reporters that she was a junior college student.