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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.Originated from the United States. The 18th Olympic Games in 1964 was listed as a competition event.19世纪末页，甲午中日战争后，西方列强掀起了瓜分中国的狂潮。孙中山登上历史舞台，他上书李鸿章失败之后，甘冒杀头危险，创建了兴中会。此时，各种革命团体纷纷应时而生，华兴会的宋教仁，黄兴出逃。讲述19岁高三时怀孕而不得不放弃学业的女主人公在39岁时与儿子考上同一所大学后发生的故事，崔智友在剧中将饰演为了在丈夫和儿子前扬眉吐气而在将近40岁时再次挑战大学的女主人公。西元2200年, 地球合纵政府开始推行宇宙自治区建设计划, 并在西元2211年正式进入宇宙殖民时代, 西元2300年后, 人类已经建立了超过三百个宇宙自治区, 漂浮于广大的太阳系之中。几百年来，地球、月球、火星以及宇宙海盗组织已经成为了宇宙的四大势力，四方势力互相拉锯。最终，人类能否突破自身的斗争宿命，能否真正迈入历史上的新世纪呢？The enhanced module pattern is used when it is suitable for those situations where the single column must be an instance of some type and some attributes or methods must be added to enhance it. For example, the following code:这是临走时尹旭特别交待的，从子午谷进军的最大好处就会这样，先将关中东部全部占领，然后迅速控制三关。