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arXiv 2109.07313cs.GT
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不可分杂务的近似 EFX 分配

Approximately EFX Allocations for Indivisible Chores

Shengwei Zhou, Xiaowei Wu

AI总结:

本文研究不可分杂务的公平分配问题,针对一般可加成本函数提出多项式时间算法,首次给出三智能体4.45-近似及n≥4智能体(3n^2-n)-近似的EFX分配结果,并在双值实例中给出精确或部分EFX分配算法。

摘要:

在本文中,我们研究如何将一组 m 个不可分杂务公平地分配给一组 n 个智能体,每个智能体对物品具有一般的可加成本函数。由于无嫉妒(EF)分配并不保证存在,我们考虑任意物品无嫉妒(EFX)的概念。与关于物品的 EFX 分配(及其近似)的丰富结果相比,关于杂务分配的已知结果非常少。在我们的工作之前,对于杂务分配,已知 EFX 分配总是存在于两个智能体或具有相同排序成本函数的一般数量智能体的情况。对于一般实例,没有已知的关于 EFX 分配的非平凡近似结果。在本文中,我们通过提供若干用于计算 EFX 和近似 EFX 分配的多项式时间算法,在这一方向上取得了进展。我们证明,对于三个智能体,我们总能计算出 EFX 分配的 4.45-近似。对于 n>=4 个智能体,我们的算法总能计算出 (3n^2-n)-近似。我们还研究了双值实例,其中智能体对杂务至多有两种成本值。对于三个智能体,我们提供了一种计算 EFX 分配的算法。对于 n>=4 个智能体,我们提出了计算最多有 n-1 个未分配物品的部分 EFX 分配的算法;以及 EFX 分配的 (n-1)-近似。

英文摘要:

In this paper, we study how to fairly allocate a set of m indivisible chores to a group of n agents, each of which has a general additive cost function on the items. Since envy-free (EF) allocations are not guaranteed to exist, we consider the notion of envy-freeness up to any item (EFX). In contrast to the fruitful results regarding the (approximation of) EFX allocations for goods, very little is known for the allocation of chores. Prior to our work, for the allocation of chores, it is known that EFX allocations always exist for two agents or general number of agents with identical ordering cost functions. For general instances, no non-trivial approximation result regarding EFX allocation is known. In this paper, we make progress in this direction by providing several polynomial time algorithms for the computation of EFX and approximately EFX allocations. We show that for three agents we can always compute a 4.45-approximation of EFX allocation. For n>=4 agents, our algorithm always computes a (3n^2-n)-approximation. We also study the bi-valued instances, in which agents have at most two cost values on the chores. For three agents, we provide an algorithm for the computation of EFX allocations. For n>=4 agents, we present algorithms for the computation of partial EFX allocations with at most n-1 unallocated items; and (n-1)-approximation of EFX allocations.

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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