arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1702.05960stat.MLmath.STstat.MEstat.TH
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模态回归的统计学习方法

A Statistical Learning Approach to Modal Regression

Yunlong Feng, Jun Fan, Johan A. K. Suykens

摘要:

本文从统计学习的角度系统地研究了非参数模态回归问题。最初的动机是追求的最大相关熵准则为基础的回归(MCCR)的理论理解,我们的研究表明,MCCR与趋于零的尺度参数基本上是模态回归。我们证明了非参数模态回归问题可以通过经典的经验风险最小化来逼近。一些努力,然后开发一个框架,分析和实现模态回归。例如,描述了模态回归函数,明确定义了模态回归风险并刻画了其\textit{Bayes}规则;为了便于计算,引入了替代模态回归风险,我们称之为泛化风险。在理论方面,对超模态回归风险、超泛化风险、函数估计误差以及三者之间的关系进行了严格的研究。结果表明,在温和的条件下,在模态回归中可以追求函数估计的一致性和收敛性,就像在香草回归协议中一样,例如均值回归,中位数回归和分位数回归。然而,它在稳健性方面优于这些回归模型,如我们的研究从重新下降的M估计的角度所示。这与MCCR在鲁棒性方面的优点相吻合,并反过来解释了MCCR的优点。在实际应用方面,讨论了模态回归的实现问题,包括计算算法和调整参数的选择。模态回归的数值评估也进行了实证验证我们的发现。

英文摘要:

This paper studies the nonparametric modal regression problem systematically from a statistical learning view. Originally motivated by pursuing a theoretical understanding of the maximum correntropy criterion based regression (MCCR), our study reveals that MCCR with a tending-to-zero scale parameter is essentially modal regression. We show that nonparametric modal regression problem can be approached via the classical empirical risk minimization. Some efforts are then made to develop a framework for analyzing and implementing modal regression. For instance, the modal regression function is described, the modal regression risk is defined explicitly and its \textit{Bayes} rule is characterized; for the sake of computational tractability, the surrogate modal regression risk, which is termed as the generalization risk in our study, is introduced. On the theoretical side, the excess modal regression risk, the excess generalization risk, the function estimation error, and the relations among the above three quantities are studied rigorously. It turns out that under mild conditions, function estimation consistency and convergence may be pursued in modal regression as in vanilla regression protocols, such as mean regression, median regression, and quantile regression. However, it outperforms these regression models in terms of robustness as shown in our study from a re-descending M-estimation view. This coincides with and in return explains the merits of MCCR on robustness. On the practical side, the implementation issues of modal regression including the computational algorithm and the tuning parameters selection are discussed. Numerical assessments on modal regression are also conducted to verify our findings empirically.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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