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你二婶身子不好，你是大夫，自然要帮着诊脉用药。1950年6月25日，朝鲜战争正式爆发。第七舰队驶入台湾海峡，美军别有用心地派飞机“误炸”安东市区，造成无辜百姓伤亡。形势所迫，愤怒的新中国领导人下了亮剑的决心。10月25日，志愿军指挥部成立。彭德怀和邓华等人根据毛泽东的战略构想，提出了打突然、打穿插、打分割包围的计策。由于麦克阿瑟的轻敌，虽然战事艰难，但志愿军将士勇锐顽强，势如破竹，打过了三八线占领了汉城。李奇微临危受命，志愿军面前出现了一个更狡猾，能力更强大的对手。新的战争态势下，双方开始漫长的谈判。经历了无数个惨烈的坑道争夺战后，1953年7月27日，正式停战。毛泽东主席的英明决策令中国打出了民族尊严，打出了新数十年的和平，更打出了一个世界的新格局。The fourth stage: pioneering and innovating//250一个抽不好，就哗啦啦都垮了。洪霖忍不住催马往山谷入口走去，白凡愣了一下，急忙打马跟上。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.View the v2 version of the image: