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219. X.X.70For 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.　　厌倦了亲人们的争吵，何悄然来至东莞，寻找当年的恋人。谁知旧情人早已作别人世，只留下一个儿子阿辉（林子聪 饰）。何将阿辉带回香港，此举更加激化了家中的遗产之争……还未问过公子尊姓大名？男子朗然再度行礼：在下姓夏名正。本片将聚焦一个古巴裔美国家庭，围绕一位准新娘的父亲如何面对女儿的婚礼展开。尹旭道：蒲俊和苏角虽然将军前来可是现在依旧不可以掉与轻心，何况现在我们还得应付义帝此时颇有些辣手。