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OvO pairs the N classes in pairs to generate N (N-1)/2 binary classification tasks. For example, OvO will train a classifier to distinguish classes Ci and Cj. The classifier takes the Ci class sample in D as a positive example and the Cj class sample as a counterexample. In the testing phase, the new samples will be submitted to all classifiers at the same time, so we will get N (N-1)/2 classification results, and the final results can be generated by voting: that is, the category that is predicted most is taken as the final classification result. Figure 3.4 shows a schematic diagram.臣听他嘲笑臣，那真是‘恶从心头起，怒向胆边生，骂他是狗算是网开一面了。India: 25,000为了复仇，一名有着悲惨过去的神秘女子进入一个权势家族，后者不仅坐拥全球美妆帝国，还隐藏着黑暗的秘密。大丈夫活在世上就是要建功立业的，西楚国已经是日落西山，越国却正好如日中天。赵培土忽然撇撇嘴道：微臣那师兄啊，也该让他多受些苦才好。影片中偶然相遇的一对男女,在釜山度过了率真淡泊的24小时.以美丽的海滨城市釜山为背景,全面描述了男女主人公从相遇到相恋再到分手的爱情故事.