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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.何况，我们麾下的士兵都是楚国人，都想着灭秦立功，风风光光地返回家乡去。　　那次我受伤了：分享你的伤心故事故事讲述十年前的一场残酷的细菌侵袭灭绝了斯堪的纳维亚的绝大多数人口，一对年轻兄妹开始了一段寻觅安全处所的旅途。兄妹二人唯一的向导是父亲的日记本，里面记录了细菌与新世界的危险。他们加入其他年轻幸存者的行列，开始了险象环生的跨境之行。面对致命灾难，这帮人必须迅速意识到，最大的危险并非来自外界，而是来自内部。Now consider the drawbacks of the above procedure她见黄观看着那张纸，脸上一副不置可否的模样，又道：少爷你肯定不相信这个吧？我当时也是不大相信的。多年前，这个少年还很青涩的时候，他们也像朋友一般相处说笑，如今却不能了。