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Considering N categories C1, C2 …, CN, the basic idea of multi-classification learning is "disassembly method", that is, multi-classification tasks are disassembled into several two-classification tasks to solve. Specifically, the problem is split first, and then a classifier is trained for each split second classification task. During the test, the prediction results of these classifiers are integrated to obtain the final multi-classification results. The key here is how to split multiple classification tasks and how to integrate multiple classifiers.From this point, we can draw a conclusion: the Vietnamese army has not only planned for a long time to use "living biological weapons", but also conducted a lot of research and drills, even live ammunition tests, before using them. According to the obtained data, it has formulated corresponding usage methods and tactics, and may even form relevant written regulations and regulations.影片故事颠覆原著，用喜剧的方式将古典童话与现代元素紧密结合。片中莉莉·科林斯扮演的白雪公主上演了一出“白富美炼成记”，不再是弱不禁风、等待王子解救的小女孩，反而在小矮人的训练下成大耍花剑的女战士。而茱莉亚·罗伯茨扮演的“大龄”王后则为解决财政困境，使出浑身解数，倒追富贵王子，成为时下“争夺高帅富”潮流中的一员。《白雪公主》中的邪恶王后都被认为是邪恶的化身。但此次茱莉亚·罗伯茨在《白雪公主之魔镜魔镜》中出演的王后却颇具喜剧色彩，还成了白雪公主的情敌，甚至不惜下魔药迷惑王子。而“矮挫穷”的代表——七个小矮人在影片中也有“出头天”，他们灵活聪慧不输“高帅富”王子，成功原因绝对值得借鉴。Finally, I would like to quote an explanation on the principle of IQOS:However, the sharp increase in express delivery has produced a large number of discarded packages, which is not a unique phenomenon in China. How do other countries solve the problems brought about by these discarded express packages? Li Li told reporters: "Germany promulgated the Packaging Waste Management Law in 1991, so Japan also has a special Packaging Waste Recycling Law, which stipulates that different packaging wastes should be recycled separately."