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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.在NBC有4部剧集的Dick Wolf获CBS直接预定13集新剧《联邦调查局 FBI》，定于18-19年度播出。（这是Dick Wolf自03年后，首次不是为NBC开发新剧）Greg Plageman执笔的《联邦调查局》顾名思义就是讲述美国著名的执法部门FBI，而该剧背景在纽约的办公室。在这个不诚实的世界里，我想带你一起追寻真相过去已经有几部优秀的纪录片说明了地球环境的巨变，并指出人类活动对地球的长期影响。《人类世:荣耀与毁灭》的独特之处，在于强调导致这种局面发生的过程，而不是单纯的陈述。　　对口凤凰村的烟霞市援建单位在重建过程中，与当地村民同呼吸共命运，凤凰村得到了重生。CW的《吸血鬼日记 The Vampire Diaries》及《吸血鬼始祖 The Originals》共同衍生剧《吸血鬼后裔 Legacies》背景设置在Salvatore学校里，17岁的Hope Mikaelson（Danielle Rose Russell饰，狼人﹑吸血鬼 ﹑女巫三重混血种）﹑Alaric Saltzman的双胞胎Lizzie﹑Josie，及其他拥有超自然血统的的年青人在此既可能建立起自我，亦可能被冲动所蒙蔽。所以他们究竟会成为英雄，还是如血统本质下成为反派？而他们的行为都在校长Alaric Saltzman（Matthew Davis饰）的监督之下。罗欧和唐觅是一对龙凤胎，一个跟爸爸姓，一个跟妈妈姓，两人父母过世早，从此兄妹两人过着相依为命的生活。时过境迁，哥哥罗欧被星探发掘出道成了一颗成长的新星，而妹妹唐觅一直平凡长大。原本星途平坦的罗欧却突然遭遇车祸昏迷不醒。这令唐觅的生活与精神跌入谷底，为了哥哥的梦想能延续，唐觅女扮男装通过海选接替了哥哥的角色，进入了剧组。进入剧组唐觅再次遇到学长杨瀚，此时的杨瀚已是如日中天的大明星，早不记得这个学妹了。杨瀚对眼前这个上进的阳光健康年轻人很是器重，但纸是包不住火的，他很快就发现了唐觅的“秘密”，一系列的误会却让两个擦出了爱的火花。