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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.黎水等他们走后，恨恨地说道：都是踩低捧高的家伙。Tennis五大恶人不敌。汉齐梁三国的总兵力达到了六十万之多，而自己手中不过只有堪堪不到十万人而已。若是太子刘盈已经成年，具有一定威信还好，可惜现在只是一个孩子。　　Christopher Jackson饰演Chunk，团队中的形象师，为客户准备上庭的造型。他亦是前全美线锋一员。Jaime Lee Kirchner饰演Danny，是队中的调查员，有超级记忆能力的前FBI审讯员。Annabelle Attanasio饰演骇客Cable，千禧一代的代表。