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代码说明：

说明：  相似度算法的实现， 在利用支持向量机进行模式分类的时候，有时需要考虑到实时性，为了提高实时性，则利用相似度算法减少样本集个数，从而减少训练时间和支持向量的个数，使得建立起的向量机实时性提高(Similarity algorithm, in the use of support vector machines for pattern classification, sometimes need to be considered real-time, in order to improve real-time, then use similarity algorithm to reduce the number of sample sets, thereby reducing training time and the number of support vectors so established to improve real-time vector machine)