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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.Model/Framework Architect: Sorry, I don't understand, I won't write.2019年3月18日，第22届上海国际电影节发布“创生万象，幕后为王”主题海报，意为本届电影节将传承经典、致敬幕后、追梦未来，激励广大电影人不忘初心、牢记本心、坚持匠心，面向广大人民群众倾心创作，助力我国从电影大国向电影强国稳步迈进。第22届上海国际电影节将于2019年6月15日-24日举行。金爵盛典及金爵奖颁奖典礼红毯仪式将分别于2019年6月15日、6月23日在上海大剧院举行。Reference: Baidu Encyclopedia: World War I Baidu Encyclopedia: World War II在家里也能学，小葱板栗能教他们，黄瓜和黄豆也是常来的。Attempt, we used onion skin or persmmon-based dyes combined with blue; In this case, the blue dye acted as a strengthener for the weaker green or pink dyes, preserving the overall color nonetheless. The combinations can of course be altered to answer any color requirements, but it is worth remembering.