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Beijing3. When you see the white Apple logo, please release the on/off key and continue to hold down the home key.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.葫芦无语，板栗愣了会，若无其事对他笑道：确实巧了。夏驰出生于一个平凡的家庭，爱好推理，进入大学之后，夏驰被室友孟秦热情地拉入了篮球社，两人成为了好兄弟。在孟秦的帮助下，夏驰对一见钟情的晴知展开了猛烈的追求，之后又因为春絮香对夏驰的喜爱，让晴知误会，使得二人再次分离，晴知离开这座城市，夏驰和春絮香感情不断升温。几年后看似平静的生活被晴知的回归打破，而好友孟秦的转变和突然的离世也使得夏驰对人生有了新的感悟和理解，夏驰不再是那个为了爱情可以牺牲一切的少年，也终于和晴知过上了平淡幸福的生活 。We have to try to replicate the achievements of outstanding people. If you fail, stop to think about why you fail, so as to create an effective psychological representation. This is the core of deliberate practice.他似乎从未看清楚过尹旭，在内心深处似乎对尹旭始终有那么一丝淡淡的畏惧。