arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.00903cs.GT
收藏

二维防策略设施选址的坐标中值机制的最优性

Optimality of the coordinate-wise median mechanism for strategyproof facility location in two dimensions

Sumit Goel, Wade Hann-Caruthers

备注：
25 pages, SAGT 2022
发表信息：
Social Choice and Welfare (2022)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

我们考虑两个维度的设施选址问题。特别是，我们认为设置代理人的欧几里得偏好，定义他们的理想点，设施位于$\mathbb{R}^2$。我们发现，$p-norm$（$p \geq 1$）的目标，坐标明智的中位数机制（CM）具有最低的最坏情况下的近似比类的确定性，匿名，和strategyproof机制。对于最小和目标和奇数代理$n$，我们表明，CM有一个最坏情况下的近似比（AR）的$\sqrt{2}\frac{\sqrt{n^2+1}}{n+1}$。对于$p-norm$社会成本目标（$p\geq 2$），我们发现CM的AR上界为$2^{\frac{3}{2}-\frac{2}{p}}$。我们推测CM的AR实际上等于任何$p\geq 2$的下限$2^{1-\frac{1}{p}}$（与$p=2$和$p=\infty$的情况一样）。

英文摘要：

We consider the facility location problem in two dimensions. In particular, we consider a setting where agents have Euclidean preferences, defined by their ideal points, for a facility to be located in $\mathbb{R}^2$. We show that for the $p-norm$ ($p \geq 1$) objective, the coordinate-wise median mechanism (CM) has the lowest worst-case approximation ratio in the class of deterministic, anonymous, and strategyproof mechanisms. For the minisum objective and an odd number of agents $n$, we show that CM has a worst-case approximation ratio (AR) of $\sqrt{2}\frac{\sqrt{n^2+1}}{n+1}$. For the $p-norm$ social cost objective ($p\geq 2$), we find that the AR for CM is bounded above by $2^{\frac{3}{2}-\frac{2}{p}}$. We conjecture that the AR of CM actually equals the lower bound $2^{1-\frac{1}{p}}$ (as is the case for $p=2$ and $p=\infty$) for any $p\geq 2$.

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。

↑