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It is strictly prohibited to have multiple tasks in a PR unless they are closely related.请听 -- 吴青峰谈判不是这样进行的，杨先生。他越来越明显的爱慕让她疑惑不已：难道他真的发现自己是女人了？还有更多吗？长久的接触，她知道胡钧品性高洁，绝不是那种轻狂鄙薄之人，是以并未担心他会对自己不利。莫非，这乌龟真有蹊跷？(未完待续。2912Category 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.