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arXiv 2001.10290cs.ITcs.LGeess.SPmath.IT
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用集合函数处理离散信号

Discrete Signal Processing with Set Functions

ETH Zurich(苏黎世联邦理工学院)

Markus Püschel, Chris Wendler

摘要:

集合函数是由有限集合N的幂集(所有子集的集合)索引的函数(或信号)。它们在许多应用领域中是基本的和普遍存在的,并已被用于,例如,正式描述或量化的损失函数的语义图像分割,传感器网络中的传感器的信息量,在推荐系统中的项目集的效用,在博弈论中的合作博弈,或投标人在组合拍卖。特别地,子模函数的子类出现在许多优化和机器学习问题中。在本文中,我们推导出离散集信号处理(SP),一种新的移位不变的线性信号处理框架的集合函数。离散集SP考虑从集合并和差运算获得的移位的不同概念。对于每个移位,它提供了移位不变滤波器、卷积、傅立叶变换和频率响应的相关概念。我们使用我们定义的广义覆盖函数的概念为我们的框架提供直观,将多元互信息识别为离散集谱的特殊情况,并激励频率排序。我们的工作带来了一套新的工具,用于分析和处理集函数,特别是,用于处理其指数性质。我们展示了两个典型的应用程序和实验:压缩子模函数优化和组合拍卖中的偏好诱导抽样。

英文摘要:

Set functions are functions (or signals) indexed by the powerset (set of all subsets) of a finite set N. They are fundamental and ubiquitous in many application domains and have been used, for example, to formally describe or quantify loss functions for semantic image segmentation, the informativeness of sensors in sensor networks the utility of sets of items in recommender systems, cooperative games in game theory, or bidders in combinatorial auctions. In particular, the subclass of submodular functions occurs in many optimization and machine learning problems. In this paper, we derive discrete-set signal processing (SP), a novel shift-invariant linear signal processing framework for set functions. Discrete-set SP considers different notions of shift obtained from set union and difference operations. For each shift it provides associated notions of shift-invariant filters, convolution, Fourier transform, and frequency response. We provide intuition for our framework using the concept of generalized coverage function that we define, identify multivariate mutual information as a special case of a discrete-set spectrum, and motivate frequency ordering. Our work brings a new set of tools for analyzing and processing set functions, and, in particular, for dealing with their exponential nature. We show two prototypical applications and experiments: compression in submodular function optimization and sampling for preference elicitation in combinatorial auctions.

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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