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终于等到杨公子了……几个月没见，赵光头胡子又长了一些，眼神中也布满了沧桑，看来他真的一直没有回去，在此等待杨长帆的消息。看着韩信那雄壮自信的背影，心中反倒是忧虑起来。说实在的，当初他也觉得韩信有才能有本事。The first step to prevent DDOS is to have a backup website or at least a temporary home page. In case the production server goes offline, it can immediately switch to the backup website, so there is no way out.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.回到张家的晚上，又想起高姨娘……这些往事虽然详细，却只是平铺直叙。