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Last but not least, the combination of various detection mechanisms makes it more difficult for attackers to bypass the entire system. Using ensemble learning, different types of detection methods such as reputation-based detection methods, artificial intelligence classifiers, detection rules and anomaly detection are combined to improve the robustness of the system, because bad actors have to make payloads to avoid all these mechanisms at the same time.It is easy to see that OvR only needs to train N classifiers, while OvO needs to train N (N-1)/2 classifiers, so the storage overhead and test time overhead of OvO are usually larger than OvR. However, in training, each classifier of OVR uses all training samples, while each classifier of OVO only uses samples of two classes. Therefore, when there are many classes, the training time cost of OVO is usually smaller than that of OVR. As for the prediction performance, it depends on the specific data distribution, which is similar in most cases.When traveling to Nagoya, the most convenient and fast mode of transportation is the subway. Nagoya's subway system is relatively developed, but it is not as complicated as Tokyo.一位单身母亲在被囚禁后尽其所能拯救她的孩子。他不成器，跟我儿子有什么相干？你休想攀扯。　　心黑手辣的朱喜杀掉参与窃宝的人，然后逃往三鸦县，半路被江湖勇士郑天炮截击，不想朱喜的情妇媚娘却乱中携藏宝图——福禄图逃跑。郑大侠中朱喜毒镖，朱喜继续逃亡，诡计多端的朱喜窃喜媚娘偷走的是假福禄图。牛喜夫妇正辛苦打工还债，发现中毒的郑天炮，于是牛喜不顾一切地救活了郑大侠。郑大侠醒来见与朱喜酷肖的牛喜几乎惊呆了，于是拨刀欲再搏斗。讲不讲规矩是一回事，懂不懂规矩是另一回事。