Approximately counting independent sets in bipartite graphs via graph containers

Approximately counting independent sets in bipartite graphs via graph containers
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通过图容器近似计算二分图中的独立集

DOI:
10.1137/1.9781611977073.24
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发表时间:
2022
期刊:
Proceedings of the 2022 Annual ACM-SIAM Symposium on Discrete Algorithms (SODA
影响因子:
--
通讯作者:
Potukuchi, Aditya
Potukuchi, Aditya
中科院分区:
--
文献类型:
--
作者:
Jenssen, Matthew;Perkins, Will;Potukuchi, Aditya

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通过实现Sapozhenko图容器方法的算法版本,我们给出了逼近二部图中独立集数目的新算法。我们的第一个算法适用于d $$ d $$‐满足弱展开条件的正则二部图:当d $$ d $$是常数,并且图是二部Ω(log2d/d) $$ \Omega \left({\log}^2d/d\right) $$‐展开器时,我们获得独立集数量的FPTAS。在此之前,对于d bbb50 $$ d>5 $$这样的结果只在满足随机二部图的更强的展开条件的图中才知道。该算法也适用于加权独立集:对于d $$ d $$‐正则,二部α $$ \alpha $$‐扩展器,α>0 $$ \alpha >0 $$固定,我们给出了在逃逸率λ=Ω(logd/d1/4) $$ \lambda =\Omega \left(\log d/{d}^{1/4}\right) $$下的硬核模型配分函数的FPTAS。最后,我们提出了一种算法,该算法适用于所有d $$ d $$‐正则二部图,运行时间为expOn·log3dd $$ \exp \left(O\left(n\cdotp \frac{\log^3d}{d}\right)\right) $$,并输出(1+o(1)) $$ \left(1+o(1)\right) $$‐对独立集数量的近似。
By implementing algorithmic versions of Sapozhenko's graph container methods, we give new algorithms for approximating the number of independent sets in bipartite graphs. Our first algorithm applies to d$$ d $$‐regular, bipartite graphs satisfying a weak expansion condition: when d$$ d $$ is constant, and the graph is a bipartite Ω(log2d/d)$$ \Omega \left({\log}^2d/d\right) $$‐expander, we obtain an FPTAS for the number of independent sets. Previously such a result for d>5$$ d>5 $$ was known only for graphs satisfying the much stronger expansion conditions of random bipartite graphs. The algorithm also applies to weighted independent sets: for a d$$ d $$‐regular, bipartite α$$ \alpha $$‐expander, with α>0$$ \alpha >0 $$ fixed, we give an FPTAS for the hard‐core model partition function at fugacity λ=Ω(logd/d1/4)$$ \lambda =\Omega \left(\log d/{d}^{1/4}\right) $$. Finally we present an algorithm that applies to all d$$ d $$‐regular, bipartite graphs, runs in time expOn·log3dd$$ \exp \left(O\left(n\cdotp \frac{\log^3d}{d}\right)\right) $$, and outputs a (1+o(1))$$ \left(1+o(1)\right) $$‐approximation to the number of independent sets.
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