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The picture shows a 500 yen locker.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.她在心里不停诅咒痛骂，为何这丫头就没死呢？害得她一场富贵打了水漂。3. The ship shall avoid crossing the navigation separation as much as possible, but if it has to cross, it shall cross in the bow direction at right angles to the total flow direction of the separation ship as much as possible.静静直视了一会，忽然二人同时出声道：真巧啊……话一出口，香荽就忍不住笑了。葫芦则用力捶了李敬文一下，笑问：板栗呢？李敬文呃了一声，尴尬道：和敬武还在后面忙。几个恶人轮番上阵，也不知过了多久，之前犹如猛虎的燕南天已被折磨得不成人形，只要是稍有心肝的人，便不忍描叙他此刻的模样。