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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.星庭之战已经过去六个月，那场战役给霍金斯镇带来了灭顶之灾，自此以后人心惶惶。在想尽各种办法之后，我们这群朋友们首次各奔东西，他们努力应对复杂的高中生活，但这并没有让事情变得更容易。在这个最脆弱的时代，一个可怕的全新超自然威胁浮出水面，并抛出了一个可怕的谜题，如果能够解开这个谜题，就可能从彻底终结恐怖的颠倒世界。An event can have many listeners attached to it. These listeners tell the system to call my XXX method when the event occurs by registering their own event handling routines.讲述性格迥异的四姐妹和她们的故事。 　　大女儿吴丰兰毕业于三流大学的文学系，原以为嫁给眼中只有自己的男人就是人生的幸福，没想到与吝啬丈夫十五年的婚姻是人生的最低谷。不仅每天要为生活费的问题和丈夫展开战争，还要检查帐簿，甚至打开冰箱算计生活费。 　　二女儿吴雪兰是全家人倾注全部心血培养的名牌女儿，有着令人羡慕的医生工作。她的人生目标就是成功的人生、幸福的婚姻，得到别人的认可。虽然表面很风光，但是苛刻的性格让和她一起生活的人感到十分疲惫。　 　　 　　三女儿五金兰是有着漂亮外表和魔鬼身材的留学派，虽然不相信婚姻，但希望有个孩子，通过人工受精在美国生下了一个女儿。但全家人并不知道这个秘密，还在张罗着把她嫁出去。 　　小女儿吴奉善从小在父母和姐姐们的疼爱下长大，虽然外形并不漂亮但是开朗自信，细心耕耘着自己的爱情。出生于传统裁缝世家的哈蕾从小梦想成为芭蕾舞者，可缺少天赋的她始终被周围人认定是“飞不起来的丑小鸭”。机缘巧合下哈蕾进入联涟娱乐集团成为一名练习生，与刚出道的偶像男团MY同属一家公司。完全没有街舞功底的哈蕾为了追求自己的舞蹈梦想，不停的拼命练习，被一向倔强自大的男团队长赫连荣光看在眼里，决定帮助这个“丑小鸭”。荣光有着惊人的舞蹈天赋，人人都羡慕他“天生的”才华，却不知其实他身上隐藏着一个巨大的秘密…… 脑中植入的一枚芯片每十年都需要重新唤醒一次，这会抹除他这十年间的所有记忆。明知自己会忘记，是否还要开始一份爱？本以为项羽会选择富饶了关中给自己，没想到他却自称西楚霸王，彭城也将被他据有。