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波洛到访伊斯坦布尔之际，替英国军方解决了一起复杂的案件。在返回伦敦的途中，他遇到了老友国际客车公司的董事Bouc先生，他为波洛在最后一刻订到了东方快车的车票。在列车上，波洛遇到了形形色色的乘客，其中有一位凶残的美国富商Samuel Ratchett告诉波洛自己的生命受到威胁，他愿意支付重金让波洛保护自己，但却遭到了波洛的拒绝。第二天清晨醒来之际，波洛发现列车受困于暴风雪中而Ratchett已经在自己的包厢内身亡。在Bouc先生和医生Constantine的协助下，波洛开始对凶案展开调查。如何？大苞谷摇头道：那也不能比。还有，马上将这批粮草运送出去。那你怎么知道《论语》就是无用的呢？因为爹没有读啊。Gloves must be worn when contacting printed boards.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.