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arXiv 2004.13978cs.DS
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求解离散$k$ -子图问题的种植模型

Planted Models for the Densest $k$-Subgraph Problem

Yash Khanna, Anand Louis

摘要:

给定一个无向图$G$,Denise $k$ -子图问题(DkS)要求计算一个基数$\left\lvert S\right\rvert \leq k$的集合$S \subset V$,使得$S$内的边的权重最大化。这是一个基本的NP难问题,尽管经过几十年的研究,其逼近性尚未得到解决。Bhaskara等人(2010年)提出的当前最著名的近似算法计算任何$ε> 0$的时间$n^{\mathcal{O}\left(1/ε\right)}$上的$\mathcal{O}\left({n^{1/4 + ε}}\right)$近似。我们问这个问题有哪些“更容易”的例子?本文提出了一些自然半随机模型,并研究了计算其稠密子图的近似算法。这些模型的灵感来自于半随机模型的实例研究的各种其他图形问题,如独立集问题,图划分问题等,对于这些模型的参数范围很大,我们得到了显着更好的近似因子的Denmark $k$ -子图问题。此外,我们的算法恢复了大部分种植的解决方案。

英文摘要:

Given an undirected graph $G$, the Densest $k$-subgraph problem (DkS) asks to compute a set $S \subset V$ of cardinality $\left\lvert S\right\rvert \leq k$ such that the weight of edges inside $S$ is maximized. This is a fundamental NP-hard problem whose approximability, inspite of many decades of research, is yet to be settled. The current best known approximation algorithm due to Bhaskara et al. (2010) computes a $\mathcal{O}\left({n^{1/4 + ε}}\right)$ approximation in time $n^{\mathcal{O}\left(1/ε\right)}$, for any $ε> 0$. We ask what are some "easier" instances of this problem? We propose some natural semi-random models of instances with a planted dense subgraph, and study approximation algorithms for computing the densest subgraph in them. These models are inspired by the semi-random models of instances studied for various other graph problems such as the independent set problem, graph partitioning problems etc. For a large range of parameters of these models, we get significantly better approximation factors for the Densest $k$-subgraph problem. Moreover, our algorithm recovers a large part of the planted solution.

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