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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.只是，洞中寒意迫人，卓一航还是脱下.身上大衣，轻轻盖在她身上，又蹑手蹑脚，退了出去。　　失业又失恋的陈美陷入困境，正在这时，她中学时代好友、时尚杂志总经理秘书罗美玲仗义地挺身而出，不但建议陈美住她那里，更带来一个消息，与她所在的“SHOW”时尚杂志社正在招聘编辑。电视剧《锄奸》改编自著名作家石钟山的同名小说。该剧由张汉杰执导，杜淳、于荣光、杨若兮联袂主演。《锄奸》讲述了由杜淳饰演的“锄奸队长”李彪与于荣光饰演的“汉奸哥哥”林振海之间错综复杂、矛盾对立的兄弟之情；展现李彪在面对昔日手足情深的兄弟时的两难与抉择，贯穿与白冬菊、胡晓月两位女主角的情感纠葛。　刚才挖他们的祖坟，还没人出来哭喊呢。