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Category division is specified through the Coding Matrix. There are many forms of coding matrix, the common ones are binary code and ternary code. The former specifies each class as a positive class and an inverse class respectively, while the latter can specify "disabled class" in addition to the positive and inverse classes. FIG. 3.5 shows a schematic diagram. In FIG. 3.5 (a), classifier f2 takes samples of Cl and C3 as positive examples and samples of C2 and C4 as counterexamples. In FIG. 3.5 (B), classifier f4 takes the samples of C1 and C4 as positive examples and the samples of C3 as counterexamples. In the decoding stage, the prediction results of each classifier are combined to form the code of the test example. The code is compared with the corresponding codes of various types, and the category corresponding to the code with the smallest distance is taken as the prediction result. For example, in Figure 3.5 (a), if based on the European distance, the prediction result will be C3.这个人自然非西楚霸王项羽莫属……可是项羽已经独自带着很久了，他们必须将这个消息禀报给霸王，得到霸王的支持和率领才行。项羽知道范增是为自己好，自己月不忍心顶撞他伤害他，可是今日……关于虞姬的事情，项羽疼爱美人，自然不愿意她受到委屈，自然而然不肯让步。Zhou Yumin这也是大家共同努力的结果。Gold entry plus flame damage seems to be invalid either."I don't know, maybe there are enough people. This is really unclear. There is one thing that I think is quite strange. Liu Guiduo asked the crew to call him 5,000 yuan that day. When it was my turn, I called my little sister. She told me that my mother had lost her cell phone and changed her new number. Let me call her and keep saying it. I looked at Liu Guiduo and he said, 'Go ahead and tell your mother to go back in a while. Don't worry'. I didn't think he could let me fight. Maybe he knew that my father had been dead for more than ten years and my mother was the only one in the family. But I thought for a moment and didn't call. I returned the phone. "