【摘 要】
：
代价敏感的排序支持向量机将样本的排序问题转换为样本对的分类问题,以适应Web信息检索.然而急剧膨胀的训练样本对使得学习时间过长.为此,文中提出一种支持二次误差的代价敏
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代价敏感的排序支持向量机将样本的排序问题转换为样本对的分类问题,以适应Web信息检索.然而急剧膨胀的训练样本对使得学习时间过长.为此,文中提出一种支持二次误差的代价敏感的平滑型排序支持向量机(cs-sRSVM),用分段多项式光滑函数近似铰链损失函数,将优化目标转变为无约束问题.再由Newton-YUAN算法求无约束问题的唯一最优解.在排序学习公开数据集LETOR的实验表明,cs-sRSVM与已有的代价敏感排序算法相比,训练时间更短,而检索性能同样出色.
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