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arXiv 2008.05569cs.DSmath.PR
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算法型Lovász局部引理的一种新交换性概念

A new notion of commutativity for the algorithmic Lovász Local Lemma

David G. Harris, Fotis Iliopoulos, Vladimir Kolmogorov

AI总结:

该研究针对算法型Lovász局部引理相关的局部搜索算法性质研究,提出了一种更具一般性的新交换性概念,可简化证明并推导这类算法的新精细化性质。

摘要:

Lovász局部引理(LLL)是概率组合学中的有力工具,可用于证明满足特定性质的对象的存在性。Moser与Tardos的突破性论文及后续研究表明,LLL与一类用于寻找这类理想对象的随机局部搜索算法存在紧密关联,具体而言,它可被视为这类算法快速收敛的充分条件。\n 除了理想对象的存在性及算法快速收敛的条件之外,人们自然会进一步提出关于这些算法性质的问题,例如“它们是否可并行化?”“它们能输出多少个解?”“解的期望‘权重’是多少?”等等。对于一类受LLL启发、被称为交换型(commutative)的算法,这些及更多问题已有答案。本文提出了一种全新的、极为自然且更具一般性的交换性概念(本质上是矩阵交换性),借助该概念,我们能够以显著简化的证明,推导出受LLL启发的局部搜索算法的若干新的精细化性质。

英文摘要:

The Lovász Local Lemma (LLL) is a powerful tool in probabilistic combinatorics which can be used to establish the existence of objects that satisfy certain properties. The breakthrough paper of Moser and Tardos and follow-up works revealed that the LLL has intimate connections with a class of stochastic local search algorithms for finding such desirable objects. In particular, it can be seen as a sufficient condition for this type of algorithms to converge fast. Besides conditions for existence of and fast convergence to desirable objects, one may naturally ask further questions regarding properties of these algorithms. For instance, "are they parallelizable?", "how many solutions can they output?", "what is the expected "weight" of a solution?", etc. These questions and more have been answered for a class of LLL-inspired algorithms called commutative. In this paper we introduce a new, very natural and more general notion of commutativity (essentially matrix commutativity) which allows us to show a number of new refined properties of LLL-inspired local search algorithms with significantly simpler proofs.

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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