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arXiv 2201.00508math.OC
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工作中的超分位数:机器学习应用和有效的次梯度计算

Superquantiles at Work: Machine Learning Applications and Efficient Subgradient Computation

Yassine Laguel, Krishna Pillutla, Jérôme Malick, Zaid Harchaoui

摘要:

R. Tyrell Rockafellar及其合作者在一系列工作中引入了基于超分位数(或条件风险值)概念的新回归建模方法。这些方法在经济学、金融学、管理科学和一般的运筹学中都有影响。最近,它们已经成为机器学习的新兴趣的主题,以解决分布式鲁棒性和公平分配的问题。在本文中,我们回顾了这些新的应用的超分位数,参考最近的发展。这些应用涉及非光滑超分位数为基础的目标函数,承认明确的次梯度计算。为了使这些基于超分位数的函数适合于机器学习中流行的基于梯度的算法,我们展示了如何通过无穷卷积来平滑它们,并描述了计算平滑近似梯度的数值过程。我们把它与其他平滑技术进行比较,并通过玩具的例子来说明它的角度的方法。

英文摘要:

R. Tyrell Rockafellar and collaborators introduced, in a series of works, new regression modeling methods based on the notion of superquantile (or conditional value-at-risk). These methods have been influential in economics, finance, management science, and operations research in general. Recently, they have been the subject of a renewed interest in machine learning, to address issues of distributional robustness and fair allocation. In this paper, we review some of these new applications of the superquantile, with references to recent developments. These applications involve nonsmooth superquantile-based objective functions that admit explicit subgradient calculations. To make these superquantile-based functions amenable to the gradient-based algorithms popular in machine learning, we show how to smooth them by infimal convolution and describe numerical procedures to compute the gradients of the smooth approximations. We put the approach into perspective by comparing it to other smoothing techniques and by illustrating it on toy examples.

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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