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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.杀手翟是金三角杀手，接下暗杀干探香明的妻子，背后竟是与毒贩勾结的警司吕进，还暗中下令杀翟灭口。香与翟同遭陷害，逃亡过程中暗生情愫，最后化敌为盟，决联手对抗吕……据悉，《墓王之王麒麟决》将由曾经打造过《少年四大名捕》、《封神》、《美人心计》、《古剑奇谭》、《宫1》、《宫2》、《盗墓笔记老九门》等热播剧的著名影视人林国华担任制作人。由2016年7月网台收视冠军剧《老九门》原班制作团队保驾护航。率领救兵赶到的是樊哙，看着吕雉呆若木鸡，刘邦倒在地上不省人事，还有满地鲜血更是醒目。The Original class is the original class, which contains the attribute value to be saved and creates a memo class to save the value value. The Memento class is a memo class, and the Storage class is a class that stores memos and holds an instance of the Memento class. This pattern is well understood. Look directly at the source code:范青道：这个不用太担心，赵高月前刚刚在杜邮处死十位王子公主，指责声不断。