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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.Advantages:该节目是为纪念哈利波特影片开始上映20周年，包括铁三角等多名演员将重聚特别节目，一起回忆哈利波特的故事。周菡就笑了。3. Installation of Engineering Dependent Modules家辉与KK、ET等人喜好飞车，一次赛事中家辉邂逅少女阿雪。恶少金十二常对阿雪骚扰，家辉出头，与十二少结怨。家辉叔父张铁柱乃巡警，反对家辉动武，又威迫十二少停手，结果遭人袭击至重伤。家辉盛怒，率童党找十二少算帐……