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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.如果有一天，那些你曾哀悼过并亲手埋葬过的亡者突然出现在你的门前，你会作何反应？如果他们声音相貌仍然和去世前一模一样，仿佛年龄从来没有变老，你又会作何反应？这是奇迹还是疯狂？亦或……那根本就不是现实？居住在阿卡迪亚市的人们就遇到了这种「亡者归来」的怪事，他们的生活从此被彻底改变。清朝咸丰年间，康宝琦（邓萃雯 饰）是京城铁帽子王爷的厨娘，跟随王爷奔赴江浙。因为水灾，苏浙民不聊生，蒋家却开仓济世受到朝廷重赏，此次王爷一行就是为了以全米宴赏赐蒋家。而康宝琦则是为了一见旧情人蒋乔（岳华 饰），即是开仓济世的蒋家老爷。而此时的蒋乔已为人父，有人认出宝琦的秘密身份并向朝廷揭发，一段尘封的往事再次被打开，在王爷的帮助下，宝琦逃过此劫并嫁入蒋家做了四姨太。此举遭到了蒋家上下的反对，米行中更是暗流汹涌。岂料，蒋乔突然离世，临终前将米行和蒋家托付给宝琦。一面是丧夫之痛，一面是蒋家上下的虎视眈眈，宝琦再次被推到风口浪尖。她能否将蒋家几十年的基业发展下去？方信哲（吴启华）本于投资公司工作，少年得志，甚得公司器重。不料，一次投资失当，顿遭投闲置散。哲决自立门户，干一番事业，为筹备资金，哲把其父于大澳的地皮出售，更与好友昌（阮兆祥）亲往大澳视察环境，因而认识了乡委会主席根（元华）及其三个女儿开心（陈松伶）、欢喜（陈妙瑛）及快乐（林芷筠）。原来根祖传的虾膏厂正占用了哲父的地皮，但哲却苦无证据证明地皮乃其父所有，只好隐藏身份暂居大澳，静待唯一知道真相的。金贤重将在剧中饰演时间旅行者，是一个年龄和出身都不明的人物，独自生存着，遇到女主之后逐渐发现人生的真谛。Then each station has its own timetable. If you want to take a bus at which station, you need to check the timetable in advance.李跛子低声喝道：现在管不了那么多了，我们必须连夜离开香溪镇。