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Http://tech.huanqiu.com/cloud/2014-12/5288347.htmlFor 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.故事以陕北榆林为背景，讲述陕北女青年沈美溪由于家庭贫寒，未能如期进入高等学府深造，在一家酒店打工，她的纯洁善良，深深打动了祖籍榆林的海归青年江涛。故事通过沈、江爱恋之情，展现了纯洁、善良、仁厚、包容的陕北女子的人性品格，以及沈美溪在复杂的家庭社会背景下所遭受的无奈和尴尬，但最终实现“有情人终成眷属”的良好愿望，揭示了爱情和幸福的真谛。被丈夫抛弃后的棉花（颜丙燕 饰）本以为找到了真爱，感情升温之际不料正房归来，经朋友介绍去照顾患有老年痴呆的盛先生（王德顺 饰），当偏见、误会、争吵都归于平静，棉花意外怀孕，引来老头女儿盛琴（艾丽娅 饰）的怀疑。一个受到几经伤害却意外怀孕的保姆，一个患老年痴呆念念不忘前妻的孤独老人，一个被丈夫冷落、被儿子指责、被父亲遗忘的女儿，三人将产生怎样剪不断理还乱的纠葛……英国ITV开始根据英国女作家Val McDermid的破案小说Dr.Tony Hill中的故事"Mermaids Singing"和"Shadows Rising"改编的英国悬疑破案剧集。之后又由其他人续写，后来在第四季度第二集"Torment"又改编自Val McDermid的Dr.Tony Hill中的故事"The Torment of Others"。