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arXiv 1606.02577cs.CCcs.DM
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广义CSP的Sherali-Adams松弛的幂

The power of Sherali-Adams relaxations for general-valued CSPs

Johan Thapper, Stanislav Zivny

摘要:

我们给出了一个精确的代数刻画的权力的Sherali-Adams松弛值约束满足问题的最优解。的条件是,有界宽度已经被证明捕捉的权力的局部一致性方法的决定CSP和半定规划的强大逼近CSP的权力。我们的特性有几个算法和复杂性的后果。在算法方面,我们表明,一些新的和许多已知的值的约束语言是通过第三层次的Sherali-亚当斯松弛易于处理。对于已知的语言,这是一个比以前获得的算法简单得多的算法。在复杂性方面,我们得到了一个二分法定理的值约束语言,可以表示一个单射一元函数。这意味着Kolmogorov和Zivny [JACM'13]建立的保守值约束语言的二分法定理的简单证明,以及极小解问题的精确可解性的二分法定理。这些是任意有限域的最小一问题的推广。我们的结果改进了Khanna等人[SICOMP'00],Jonsson等人[SICOMP'08]和Uppman [ICALP'13]以前的几个分类。

英文摘要:

We give a precise algebraic characterisation of the power of Sherali-Adams relaxations for solvability of valued constraint satisfaction problems 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 characterisation has several algorithmic and complexity consequences. On the algorithmic side, we show that several novel and many 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 the previously obtained ones. 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 Zivny [JACM'13], and also a dichotomy theorem for the exact solvability of Minimum-Solution problems. These are generalisations of Minimum-Ones problems to arbitrary finite domains. Our result improves on several previous classifications by Khanna et al. [SICOMP'00], Jonsson et al. [SICOMP'08], and Uppman [ICALP'13].

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