The Power of Sherali-Adams Relaxations for General-Valued CSPs

The Power of Sherali-Adams Relaxations for General-Valued CSPs
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Sherali-Adams 放宽对于普通价值 CSP 的作用

DOI:
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发表时间:
2016
期刊:
SIAM journal on computing (Print)
影响因子:
--
通讯作者:
Stanislav Živný
Stanislav Živný
中科院分区:
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文献类型:
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作者:
Johan Thapper;Stanislav Živný

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我们对Sherali的功率进行精确的代数表征 - ADAMS松弛,以解决有价值的约束满意度问题(CSP)到最佳状态。决策CSP和半决赛的功率,用于CSP的稳健近似。证明几种新颖的有价值的约束语言是可以通过Sherali-Adams放松的第三级,这是一种比以前在复杂性方面的算法要简单得多。有价值的约束语言的二分法定理,可以表达一个注入性的一元功能。 Kolmogorov和Zivný[J. ACM,60(2013),10],也是...
We give a precise algebraic characterization of the power of Sherali--Adams relaxations for solvability of valued constraint satisfaction problems (CSPs) to optimality. The condition is that of bounded width, which has already been shown to capture the power of local consistency methods for decision CSPs and the power of semidefinite programming for robust approximation of CSPs. Our characterization has several algorithmic and complexity consequences. On the algorithmic side, we show that several novel and well-known valued constraint languages are tractable via the third level of the Sherali--Adams relaxation. For the known languages, this is a significantly simpler algorithm than those previously obtained. On the complexity side, we obtain a dichotomy theorem for valued constraint languages that can express an injective unary function. This implies a simple proof of the dichotomy theorem for conservative valued constraint languages established by Kolmogorov and Živný [J. ACM, 60 (2013), 10], and also a ...
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