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7. After the plane flies, it can look down at the earth as if it were in the sky.本来已停止冲锋的明军再次忘我前冲，比刚刚杀敌还要更积极一些。杨长帆言归正传，我救你们，你们帮我对付一批倭寇，事成之后每人五两，拿了银子想回乡也好，想继续跟着我也好，随你们。天苍茫，地寥廓。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.就在这时，燕南天听到一丝细微声响。