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In practice, we often see some of the most advanced groups of spammers trying to derail Gmail filters by reporting a large amount of spam as non-spam. As shown in the figure, from the end of November 2017 to the beginning of 2018, there were at least four large-scale malicious actions trying to distort our classifier.　　1953年，黑人家庭Emory一家从北卡罗来纳州搬去洛杉矶的一个全白人社区，看似理想安逸的地方却隐藏着现实与超自然的危险。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.故事描述僵尸病毒已经侵袭美国三年时间，这个国家已经彻底成为僵尸的天下。一个由凡人英雄组成的团队必须护送僵尸危机中唯一一名幸存者从纽约前往加州——那里保留着美国唯一能正常运转的病毒实验室，如果能得到这名幸存者的血样，说不定他们能研制出抗病毒疫苗。虽然这名幸存者携带的抗体是人类生存下去的最后希望，但他却隐藏了一个足以毁灭一切的黑暗秘密。无论如何，这个庶民团队还是像「魔戒远征军」一样从纽约启程了，在抵达3000英里外的目的地之前，他们必须横跨遍布僵尸的美洲大陆。在这个后末日时代，他们要面对的危险还远不止吃人的僵尸这么简单。Return new MyIterator (this);-Only when one has experienced the test of life and death, or seen where will you go's joys and sorrows, and has the courage and confidence to live, can one say frankly: Grandma's!看来他们认定了沙加路的所见，三十门他们留下的防御火炮就是此刻全部的火力防御。