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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.聪明可爱的大头儿子5岁了，他和小头爸爸、围裙妈妈一起住在模范和谐小区——幸福小区。大头儿子是一个充满了好奇心和探索欲的孩子，小头爸爸成了他的导师和玩伴。父子俩经常沉浸在“游戏”的世界里，偶尔搞出一些新花样，乐此不疲。大头儿子最感兴趣的就是宇宙太空。他会因为学习唐诗而尝试自己种大米，他会在图画纸上画出土豆树，他会帮助爸爸克服“健忘症”，也会在妈妈生病的时候担当起小男子汉的责任，他会梦想拥有超能力，也会渴望成为大英雄。他沐浴在亲情和友爱之中，通过生活中一件件普通的小事，增长了知识，锻炼了心智，学会耐心、坚持和勇敢。楚人一系列的动作，目的很明确，就是逼得章邯与秦庭离心离德，越走越远。The first is to force important things into the field of vision of the pipeline.1. Creator: FactoryPizzaStore as defined above. It is an abstract class, which defines the method of creating objects. This method is an abstract method, and the specific process of creating objects is implemented by its subclasses. This abstract class usually relies on an abstract Product (another role in the factory method pattern) class. These abstract products are made by subclasses, and the creators do not care what kind of products are made.In the past two years, the educational policy inclined to the direction of quality education has impacted on the examination-oriented counseling and training of mathematics and other disciplines, forcing some K12 discipline training institutions to begin to lay out the direction of quality education and explore the way of discipline quality education. For example, subject counseling agencies such as Learning and Thinking, New Oriental and Elite Education, with a keen sense of smell, have begun to work hard on the cultivation of children's thinking ability at an early stage.