Learning to Rank的一个方法，把排序问题转换成了一个分类问题，然后用支持向量机（SVM）训练出一个模型来。-Learning to Rank of a way to sort problem is transformed into a classification problem, and then use support vector machine (SVM) to train a model.

rank of a svm is used to classify

linear svm method for version 3.18

RankSvm:实现了RankSvm，使用blas依赖库-RankSvm: realized RankSvm, use blas dependent libraries