Robust non-convex least squares loss function for regression with outliers

Robust non-convex least squares loss function for regression with outliers
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用于异常值回归的鲁棒非凸最小二乘损失函数

DOI:
10.1016/j.knosys.2014.08.003
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发表时间:
2014-11
期刊:
Knowledge-Based System
影响因子:
--
通讯作者:
Zhong Ping
Zhong Ping
中科院分区:
其他
文献类型:
--
作者:
Wang Kuaini;Zhong Ping

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本文提出了一种鲁棒的最小二乘支持向量回归(LS-SVR)方法,称为RLS-SVR。该方法采用非凸的最小二乘损失函数,克服了LS-SVR对异常值敏感的局限性。非凸损失对于任何大的离群值给出恒定的惩罚。所提出的损失函数可以用一个凸函数的差来表示。由此产生的优化是DC程序。它可以通过使用凹凸过程(CCCP)来解决。RLS-SVR通过一次求解一组线性方程组来迭代地构建回归函数。所提出的RLS-SVR包括经典的LS-SVR作为其特殊情况。在人工数据集和基准数据集上的数值实验证实了该算法的有效性。
In this paper, we propose a robust scheme for least squares support vector regression (LS-SVR), termed as RLS-SVR, which employs non-convex least squares loss function to overcome the limitation of LS-SVR that it is sensitive to outliers. Non-convex loss gives a constant penalty for any large outliers. The proposed loss function can be expressed by a difference of convex functions (DC). The resultant optimization is a DC program. It can be solved by utilizing the Concave–Convex Procedure (CCCP). RLS-SVR iteratively builds the regression function by solving a set of linear equations at one time. The proposed RLS-SVR includes the classical LS-SVR as its special case. Numerical experiments on both artificial datasets and benchmark datasets confirm the promising results of the proposed algorithm.
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