论文标题
在预算中使用少量功能排名
Ranking with submodular functions on a budget
论文作者
论文摘要
亚辅导最大化一直是许多重要的机器学习问题的骨干,并且在病毒营销,多元化,传感器放置等方面有应用。但是,在选择一组项目的背景下,主要限制了最大化下函数的研究。另一方面,许多现实世界应用都需要解决一组项目的排名解决方案。以前已经考虑过在子模函数最大化的上下文中排名的问题,但程度远低于项目选择公式。在本文中,我们探讨了一种新颖的表述,用于对具有下估值和预算限制的项目进行排名。我们将此问题称为最大值排名(MSR)。更详细地说,给定一组项目和一组非降低的子模块功能,其中每个功能都与预算关联,我们旨在找到一组项目的排名,以最大程度地提高预算约束下所有功能所获得的值的价值之和。对于MSR问题,我们提出了具有近似保证的实用算法的基数和背包型预算约束。此外,我们进行了经验评估,该评估证明了所提出的算法对强基础的卓越性能。
Submodular maximization has been the backbone of many important machine-learning problems, and has applications to viral marketing, diversification, sensor placement, and more. However, the study of maximizing submodular functions has mainly been restricted in the context of selecting a set of items. On the other hand, many real-world applications require a solution that is a ranking over a set of items. The problem of ranking in the context of submodular function maximization has been considered before, but to a much lesser extent than item-selection formulations. In this paper, we explore a novel formulation for ranking items with submodular valuations and budget constraints. We refer to this problem as max-submodular ranking (MSR). In more detail, given a set of items and a set of non-decreasing submodular functions, where each function is associated with a budget, we aim to find a ranking of the set of items that maximizes the sum of values achieved by all functions under the budget constraints. For the MSR problem with cardinality- and knapsack-type budget constraints we propose practical algorithms with approximation guarantees. In addition, we perform an empirical evaluation, which demonstrates the superior performance of the proposed algorithms against strong baselines.