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Chapter IV Fire Protection Technical Service Activities　　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.身为重案组里唯一的女性成员，简（安吉·哈蒙 Angie Harmon 饰）可一点也不输给她那些精明强干的男同事们。对于简来说，没有什么比时时保持警惕更为重要的了，她的那股子劲头，仿佛是在和整个世界作战。　　丁蟹获提早假释出狱进军股票界，不想事业竟一帆风顺，方展博在众人，尤其红颜知已阮梅（周慧敏）和龙纪文（郭蔼明）、好友陈滔滔（林保怡）的帮助下，欲借股票把丁蟹彻底打败。田遥在板栗和葫芦的有意照应下，很快融入这热闹之中。"State Mode"