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arXiv 1606.08362cs.DScs.AIcs.LG
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具有递减收益的格次模函数优化的一个约简

A Reduction for Optimizing Lattice Submodular Functions with Diminishing Returns

University of Warwick(华威大学);Toyota Technological Institute at Chicago(芝加哥丰田理工学院)

Alina Ene, Huy L. Nguyen

摘要:

一个函数$f: \mathbb{Z}_+^E \rightarrow \mathbb{R}_+$是DR-次模的,如果它对所有${\bf x}\le {\bf y}, i\in E$都满足$f({\bf x} + χ_i) -f ({\bf x}) \ge f({\bf y} + χ_i) - f({\bf y})$。最近,最大化的DR-子模函数$f: \mathbb{Z}_+^E \rightarrow \mathbb{R}_+$的预算约束$\|{\bf x}\|_1 \leq B$以及额外的约束的问题已经得到了显着的关注\cite{SKIK14,SY15,MYK15,SY16}。本文给出了从DR-次模集到次模集的一般约简。约简的运行时间和产生的子模块实例的大小仅取决于\emph{logarithmically}和$B$。使用这种减少,可以将无约束和约束子模最大化的结果以统一的方式转换为许多类型的约束的DR-子模设置。

英文摘要:

A function $f: \mathbb{Z}_+^E \rightarrow \mathbb{R}_+$ is DR-submodular if it satisfies $f({\bf x} + χ_i) -f ({\bf x}) \ge f({\bf y} + χ_i) - f({\bf y})$ for all ${\bf x}\le {\bf y}, i\in E$. Recently, the problem of maximizing a DR-submodular function $f: \mathbb{Z}_+^E \rightarrow \mathbb{R}_+$ subject to a budget constraint $\|{\bf x}\|_1 \leq B$ as well as additional constraints has received significant attention \cite{SKIK14,SY15,MYK15,SY16}. In this note, we give a generic reduction from the DR-submodular setting to the submodular setting. The running time of the reduction and the size of the resulting submodular instance depends only \emph{logarithmically} on $B$. Using this reduction, one can translate the results for unconstrained and constrained submodular maximization to the DR-submodular setting for many types of constraints in a unified manner.

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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