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Privileges.pyCategory 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.任何事情都不是随随便便就可以做到的，说到底还是利益交换。山子，你外婆跟雪莲爷爷那可是亲兄妹，老太太当年只生了他们两个，好的不得了。为了玉米，我当‘入虎穴，擒虎子、与虎谋皮。　　地震后，在党和政府的关心下，佑宁受伤的弟妹被送往外地治疗，佑宁和佑男被送到石家庄育红学校。在育红学校里，佑宁遇到了她人生的第一个老师。老师告诉她，她应该学会和别人相处，只有这样，她和她的弟妹才可能拥有一个健康快乐的人生。