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2.2. 2 Pin-to-Pin Spacing RequirementsFor 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.1. Let's briefly describe a click event (without involving method calls, there is a general system first)一桩强暴案件震惊了整个德里，副警务处长瓦尔迪卡·查图尔维迪展开对凶犯的艰苦搜寻。改编自 2012 年印度黑公交轮奸案。该剧取材于韩国最早民间故事集《於于野谭》中歙谷县令金聃龄（李敏镐饰）将被渔民捕获的人鱼放归大海的人鱼传说。讲述数百年之后濒临灭绝来到都市里的人鱼沈清（全智贤饰）适应陆地生活和天才骗子许俊宰（李敏镐饰）重逢并陷入爱情的故事韩国与朝鲜共同研制的核武器“飞击震天雷”决定转交给美国，朝鲜上校姜敏吉（金胜宇 饰）对此不满，他为了阻止核武器移交而绑架了核物理学博士金秀燕（孔孝珍 饰），再从研究所偷出“飞击震天雷”准备逃跑。此时，每隔433年与地球相遇的特大彗星正通过朝鲜半岛上空，逃跑的姜敏吉一行和追踪而来的韩国上校朴政宇（黄正敏 饰）同被龙卷风卷走，消失得无影无踪。