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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.虽说有迫不得已的成分，可是听起来却是那样无情，那样让人心碎。还装什么醉呀。小葱流泪不止，哽咽道：二叔……张杨慌忙抬起粗黑的手掌帮她拭泪，安慰道：莫哭，莫哭。平凡小捕快连年为揭穿骗子张震天的真面目，在一次误打误撞下杀死了妖道的义子。原来年乃脚踏七星之士，是唯一能接掌道教天师一位的人。妖道得悉其身份后，便派出荷抱子亲近之，欲置他于死地。年屡次身陷险境，幸得玄丹子多番出手相助，才安然无恙。 　　另一方面，年一直倾慕富家小姐龙菁菁，所以对于接掌天师一事，不感兴趣。后菁被父逼婚，遂随年浪迹江湖，感情突飞猛进。而一直暗恋菁的天为成全二人，毅然放弃，后与玄丹子展开另一段爱情… 　　不久，荷抱子身份遭识破，年晴天霹雳，但仍处处维护她，更与菁菁等反目，究竟夹于正邪两女之间，年会如何抉择？