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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.6 G # q7 B u + S (m2. Sensitivity年轻人就是任性胡闹。板栗看着她眨眨眼睛，嘴角微微一翘，丢给她一个心领神会的笑容。只是吴有才他们能放心吗？而且自己今日还巧取豪夺一块玉佩。Then I called the health workers to rescue Zhou Xiaolin, While looking at that thing, After careful identification, Only then did I find that the mouth of this thing is not the kind that ordinary animals open and close up and down. But like a 4-petal 'flower', it has 4 lips, which are arranged centripetally in a way of 2 above and 2 below respectively. When it opens, it also looks like a blooming flower. Its structure is a bit like 'X' in English letters. Moreover, the 4 lips are all densely packed with small fangs, which make people's scalp pins and needles. "Zhao Mingkai said.