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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.延续《云端》第一季的故事。 消失多年的知名悬疑小说家黄蝎（罗康饰）携惊人秘密归来，张言的好兄弟、好老板郑雄（江奇霖饰）将以全新的特殊身份“重置”这场游戏。你有没有玩过碟仙？究竟碟仙是解你疑难，还是带更多难题给你？《凶宅清洁师》就于最真实的生活场景，创造了一个由一只碟而起的“鬼空间”。这个空间将所有人物命运牵连，要解开千丝万缕的人鬼关系，身为凶宅清洁师的招仔就要不停收鬼，过程中提升能力，搜寻线索，以解决碟仙鬼为终极目标。大家又可不可以化身招仔，将谜题逐一解开？该片由拉齐·马凯执导，贾里德·巴特勒、拉尔斯·诺伯格编剧，约翰·库萨克、埃拉·科尔特兰([少年时代])领衔主演。讲述一个狡诈的商人(约翰·库萨克饰)意外误丢脏款，被三个年轻人捡到。娘退让一步，让素谨做妾，这还不行吗？你要让我……死不瞑目？还是你听从你父亲的话，不认我这亲娘？那娘就死心了，就当没生过你。