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arXiv 1507.08708cs.GT
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为真实性设定下限

Setting Lower Bounds on Truthfulness

Ahuva Mu'alem, Michael Schapira

摘要:

我们提出并讨论了一般技术证明真实机制的不可逼近性结果。我们利用这些技术来证明几个非功利的多参数问题的逼近下界。特别是,我们展示了我们的技术的实力,表现出一个下界的$2-\frac{1}{m}$的调度问题与不相关的机器(制定为一个机制设计问题的开创性文件中的Nisan和Ronen的机械机制设计)。我们的下限适用于真实的随机机制(不考虑这些机制的运行时间的任何计算假设)。此外,它甚至适用于随机机制的较弱的真实性概念-即,期待中的真实对于两台机器的情况(存在非真实的FPTAS),该下限几乎匹配已知的$\frac{7}{4}$(随机化)真实上限。在多参数设置中,真实随机机制的下限以前是未知的。我们展示了我们的技术在网络中的工作量最小化问题的应用。我们证明了我们的下界这个问题的域间路由设置Feigenbaum,Papadimitriou,萨米和申克。最后,我们讨论了几个非功利主义的“公平”的概念(最大最小公平,最小最大公平,嫉妒最小化)。我们展示了如何我们的技术可以用来证明这些概念的下限。

英文摘要:

We present and discuss general techniques for proving inapproximability results for truthful mechanisms. We make use of these techniques to prove lower bounds on the approximability of several non-utilitarian multi-parameter problems. In particular, we demonstrate the strength of our techniques by exhibiting a lower bound of $2-\frac{1}{m}$ for the scheduling problem with unrelated machines (formulated as a mechanism design problem in the seminal paper of Nisan and Ronen on Algorithmic Mechanism Design). Our lower bound applies to truthful randomized mechanisms (disregarding any computational assumptions on the running time of these mechanisms). Moreover, it holds even for the weaker notion of truthfulness for randomized mechanisms -- i.e., truthfulness in expectation. This lower bound nearly matches the known $\frac{7}{4}$ (randomized) truthful upper bound for the case of two machines (a non-truthful FPTAS exists). No lower bound for truthful randomized mechanisms in multi-parameter settings was previously known. We show an application of our techniques to the workload-minimization problem in networks. We prove our lower bounds for this problem in the inter-domain routing setting presented by Feigenbaum, Papadimitriou, Sami, and Shenker. Finally, we discuss several notions of non-utilitarian "fairness" (Max-Min fairness, Min-Max fairness, and envy minimization). We show how our techniques can be used to prove lower bounds for these notions.

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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