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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.第七季以百年一度的大流行病导致世界各地的医疗崩溃为舞台，新局面迎来是日本最高峰的教学医院—东帝大学医院，把感染治疗和内科作为重中之重，并计划推迟不必要的紧急手术。曾经知名的外科被移往分院的大楼，内科医生推广不使用手术刀的化学手术，显示出兴起的迹象。被感染危机和东帝大新权力席卷的未知子，在如同战场般疲惫的医疗现场也毫不退缩地走上了自己的道路。//An example of periodically modifying the state according to time:本片是一部网络单元剧，故事围绕着一个奇特剧组的日常工作展开。讲述了一众演员与导演之间的日常工作与生活。主演刘背实和他的小伙伴们是一群有想法的演员。每次表演都会与导演从创作角度激烈讨论，提出各种奇葩想法。他们的各种坚持，看似合理，但有时候拍摄过程会令人啼笑皆非，甚至使剧集完全偏离初衷导致拍摄中断，最后还是按照传统模式完成拍摄工作。本片还原了众多观众熟知的经典片段，从专业的编剧、表演、拍摄等等角度对其进行结构、再创作。通过一个个经典场景与故事，引发观众的共鸣，让大家在笑声中思考，对自己的职业有担当、肯用心，同时尊重客观规律，保持积极向上的态度，时刻传播正能量，就能创作出广为观众喜欢的作品。一院子人都跟着忙……兄弟几个笑得前仰后合，都说他终于被管住。过于亲切容易引起误会，而小小的误会容易引起冲突，而小小的冲突容易引发一个血案……