Improving the Smoothed Complexity of FLIP for Max Cut Problems

Improving the Smoothed Complexity of FLIP for Max Cut Problems
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提高 FLIP 最大割问题的平滑复杂度

DOI:
10.1145/3454125
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发表时间:
2021
影响因子:
1.3
通讯作者:
Chandrasekaran, Karthekeyan
Chandrasekaran, Karthekeyan
中科院分区:
计算机科学3区
文献类型:
--
作者:
Bibak, Ali;Carlson, Charles;Chandrasekaran, Karthekeyan

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寻找局部最优解formax - cutandmax -k- cut是众所周知的pls完全问题。寻找这种局部最优解的一种本能的方法是FLIP方法。尽管FLIP在最坏情况下需要指数级的时间,但在实际情况下,它往往会很快终止。为了解释这种差异,我们在平滑复杂度框架下研究了FLIP的运行时间。Etscheid和Röglin (ACM Transactions on Algorithms, 2017)表明,FLIP格式切割任意图的平滑复杂度是拟多项式的。Angel, Bubeck, Peres, and Wei (STOC, 2017)表明,FLIP格式-剪切完全图的平滑复杂度为(OΦ5n15.1),其中Φ为随机边权密度的上界,Φ为输入图中的顶点数。虽然Angel, Bubeck, Peres和Wei的结果显示了第一个多项式平滑复杂性,但他们也推测他们的运行时间界限远非最佳。在这项工作中,我们在改进运行时界限方面取得了实质性进展。我们证明了FLIP格式切割完全图的光滑复杂度isO(Φn7.83)。我们的结果基于一个精心选择的矩阵,该矩阵的秩捕获了方法的运行时间,以及该矩阵的改进秩界和基于该矩阵的改进联合界。此外,我们的技术为在平滑框架中分析FLIP提供了一个通用框架。我们通过证明FLIP forMAX-3-CUTin完全图的光滑复杂度是多项式,forMAX-k-CUTin任意图的光滑复杂度是拟多项式来说明这个一般框架。我们相信我们的技术也应该对展示更大常数的FLIP forMAX-k-CUTin完全图的光滑多项式复杂度感兴趣。
Finding locally optimal solutions forMAX-CUTandMAX-k-CUTare well-known PLS-complete problems. An instinctive approach to finding such a locally optimum solution is the FLIP method. Even though FLIP requires exponential time in worst-case instances, it tends to terminate quickly in practical instances. To explain this discrepancy, the run-time of FLIP has been studied in the smoothed complexity framework. Etscheid and Röglin (ACM Transactions on Algorithms, 2017) showed that the smoothed complexity of FLIP formax-cutin arbitrary graphs is quasi-polynomial. Angel, Bubeck, Peres, and Wei (STOC, 2017) showed that the smoothed complexity of FLIP formax-cutin complete graphs is (OΦ5n15.1), where Φ is an upper bound on the random edge-weight density and Φ is the number of vertices in the input graph.While Angel, Bubeck, Peres, and Wei’s result showed the first polynomial smoothed complexity, they also conjectured that their run-time bound is far from optimal. In this work, we make substantial progress toward improving the run-time bound. We prove that the smoothed complexity of FLIP formax-cutin complete graphs isO(Φn7.83). Our results are based on a carefully chosen matrix whose rank captures the run-time of the method along with improved rank bounds for this matrix and an improved union bound based on this matrix. In addition, our techniques provide a general framework for analyzing FLIP in the smoothed framework. We illustrate this general framework by showing that the smoothed complexity of FLIP forMAX-3-CUTin complete graphs is polynomial and forMAX-k-CUTin arbitrary graphs is quasi-polynomial. We believe that our techniques should also be of interest toward showing smoothed polynomial complexity of FLIP forMAX-k-CUTin complete graphs for larger constantsk.
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