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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.他是一个很普通的人，有妻子，有女儿，面临下岗危机。 　　他是一个有福气的人，再就业，当保姆，继承大所房产。 　　赵公是一个很普通又很特别的人，比如，他像普通人一样，有一位妻子，叫林娜，林娜眼神儿不好，常区分不出来哪是电线杆子哪是人；他有一个女儿，叫雯雯，很聪明，时常聪明过了头；他还有一个常来家里走动的妻妹——林娜的表妹，叫晓华，是电视台的编导兼主持人，才貌双全又没心没肺。 　　赵公像很多人一样很善良，不同的是他从来都没有意识过自己的善良…… 　　有一天，赵公下岗了，下岗的当天，他就进了职业介绍所，不久，就得到了一个给人家当男保姆的工作。赵公服务的对象是一位八十多岁的老爷子——黄老先生。黄老先生无儿无女，却有一大院房子，据说还是当年什么王爷住过的。 　　给黄老先生看病的王大夫费尽心机想得到这院房子，结果什么也没有得到，应了那句“傻人有傻福”的话，黄老先生将一大院房子留给了从未算计过自己的赵公一家。 　　自打有了这院房子，赵公一家的生活变得热闹起来，总有各种心怀叵测的人走进这院子。作为房东，赵公对57 岁的失业男子亚兰·德兰波受到一个诱人职缺吸引，但当他发现自己竟是残酷企业游戏中的一颗棋子，事态开始急转直下。Ningxia Hui Autonomous RegionValue 3: Uniqueness and Speciality! The unique you, the unique full set of legal tender, will never come again if you miss it. And it is exclusive, with birthdays every year, but this birthday gift is really related to your birthday and is specially tailored for you. Only you can collect it.和明教慷慨激昂的声音相对的是，六大门派的嘶声呐喊，钟情欢呼。