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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.傅宽虽然答应的很确定，可是具体施行起来到底不如曹参谨慎仔细。SSL Flood如今我吃啥都香，身子爽快的很。去年播出过的TV朝鲜台综艺《小区专辑》最近确定成为正式节目。《小区专辑》是到访问陌生社区各处收集歌曲，制作包含该社区回忆的合辑专辑的音乐综艺。和社区邻里自然地沟通，用80年代至90年代流行过的多样歌曲来给观众们传达不一样的趣味。……什么？章邯失去了踪迹？没追上？听到灌婴的禀报，韩信不由的一惊。