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arXiv 2012.04327cs.CC
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解决拥挤博弈中纳什均衡的复杂性

Settling the complexity of Nash equilibrium in congestion games

Yakov Babichenko, Aviad Rubinstein

摘要:

我们考虑(i)在拥塞博弈中寻找(可能是混合的)纳什均衡的问题,以及(ii)寻找光滑函数$f:[0,1]^n \rightarrow \mathbb{R}$的梯度下降动态的(指数精度)不动点的问题.我们证明了这些问题是等价的。我们的结果适用于各种明确的描述$f$,从(几乎一般)算术电路,度$5$多项式。最近的结果[Fearnley,Goldberg,Hollender,Savani '20]这意味着这些问题是PPAD $\cap$ PLS-完全的。作为推论,我们还得到了以下等价的复杂性类:CCLS = PPAD $\cap$ PLS。

英文摘要:

We consider (i) the problem of finding a (possibly mixed) Nash equilibrium in congestion games, and (ii) the problem of finding an (exponential precision) fixed point of the gradient descent dynamics of a smooth function $f:[0,1]^n \rightarrow \mathbb{R}$. We prove that these problems are equivalent. Our result holds for various explicit descriptions of $f$, ranging from (almost general) arithmetic circuits, to degree-$5$ polynomials. By a very recent result of [Fearnley, Goldberg, Hollender, Savani '20] this implies that these problems are PPAD$\cap$PLS-complete. As a corollary, we also obtain the following equivalence of complexity classes: CCLS = PPAD$\cap$PLS.

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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