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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.　　在布莱尔小镇上，长久以来流传着关于杀害孩子的女巫布莱尔的传说，这里集中的儿童墓地，还有小镇上几乎人尽皆知的古老故事，都印证着女巫的存在。迈克等三名同学，在一个平静的周日展开了对布莱尔故事的追索，可是在他们深入密林的同时，诅咒也开始降临在他们头上。For the market, After all, the cultivation of children's thinking ability is still a new field in the education market. Although online children's English has cultivated a market for online learning, making many parents begin to receive online education, the development of the track still needs a process of cultivating the market because parents' awareness of thinking ability cultivation and online learning of thinking ability is not high enough. At present, most of the children's thinking ability line work class organizations still focus on word-of-mouth communication, WeChat circle of friends sharing and customer group fission in terms of marketing and promotion, and have not yet invested in large-scale marketing.慧儿不满道：大半夜的，跑到咱们家来要杀人，这算什么好人？紫茄道：他本来就不是坏人。Download Address: https://www.oracle.com/technnetwork/java/javase/downloads/index-jsp-138363. Html徐风，季木霖握住他勾在自己衣领的手，这一年多来，我只在那一次错口骂过你‘无耻，你不是贱人，我也从不觉得你贱，只是你这份爱是真的错付了。