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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.可见娃儿大了，总让人这么说来说去的。葫芦也不理，淡然对他道：想是夏天雨水多了的缘故。一个原本和睦的四口之家，因当保安的丈夫出轨闹离婚，致使家庭处于长期的争吵当中。大儿子毕诺正处于面临高考的高三年级，父母不和给他带来沉重的思想压力，学习成绩一落千丈。丈夫的家暴加重了婚姻的不幸，作为护士长的妻子李丹不堪重压，在自己医院的天台上纵身一跃结束了生命。悲剧和不幸给这个家庭带来了无尽的痛苦和愧疚。About 7 to 8 o'clock, there may be meat in the middle of the night.只有这样，才能有更多的佳作出现。本片讲述了由军人和地方人员共同研究国外飞来的飞行物，在研发过程中要面对各国的豺狼虎豹，然后组成了”利剑行动小组“在错综复杂的危险环境中，每名成员发挥各自智慧和特长，形成战无不胜的力量，在惊心动魄中，把国家赋予的使命向前推进。在进行了激烈的斗争后，我方拿到了飞行器的残壳。此后，展开殊死搏斗。