arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.02643cs.ITcs.DBmath.ITmath.STstat.TH
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通用图压缩:随机块模型

Universal Graph Compression: Stochastic Block Models

Alankrita Bhatt, Ziao Wang, Chi Wang, Lele Wang

AI总结:

针对随机块模型图数据,本文通过二维变换与Krichevsky–Trofimov压缩器提出多项式时间的通用无损压缩方案,在四个基准数据集上显著优于现有算法。

摘要:

受处理社交网络和生物网络等大规模图数据这一普遍数据科学应用的推动,本文研究标记图形式数据的无损压缩。具体而言,我们考虑一种广泛使用的随机图模型——随机块模型(SBM),该模型能够刻画社交网络中的聚类效应。本文采用一种信息论通用压缩框架,其目标是设计单一压缩器,在不知道SBM参数的情况下,对每一种SBM分布都达到渐近最优压缩率。本文提出了这样一种图压缩器,它对一大类SBM均能以多项式时间复杂度通用地达到最优压缩率。现有通用压缩技术主要针对平稳遍历的一维序列开发;然而,SBM的邻接矩阵具有复杂的二维相关性。本文通过精心设计的变换缓解了这一挑战,该变换将二维相关数据转换为几乎独立同分布的子矩阵。随后,使用Krichevsky–Trofimov压缩器压缩这些子矩阵组成的序列,并将其长度分析推广到同分布但任意相关的序列。在四个基准图数据集上,竞争算法生成的压缩文件所需空间是所提方案的2.4至27倍。

英文摘要:

Motivated by the prevalent data science applications of processing large-scale graph data such as social networks and biological networks, this paper investigates lossless compression of data in the form of a labeled graph. Particularly, we consider a widely used random graph model, stochastic block model (SBM), which captures the clustering effects in social networks. An information-theoretic universal compression framework is applied, in which one aims to design a single compressor that achieves the asymptotically optimal compression rate, for every SBM distribution, without knowing the parameters of the SBM. Such a graph compressor is proposed in this paper, which universally achieves the optimal compression rate with polynomial time complexity for a wide class of SBMs. Existing universal compression techniques are developed mostly for stationary ergodic one-dimensional sequences. However, the adjacency matrix of SBM has complex two-dimensional correlations. The challenge is alleviated through a carefully designed transform that converts two-dimensional correlated data into almost i.i.d. submatrices. The sequence of submatrices is then compressed by a Krichevsky--Trofimov compressor, whose length analysis is generalized to identically distributed but arbitrarily correlated sequences. In four benchmark graph datasets, the compressed files from competing algorithms take 2.4 to 27 times the space needed by the proposed scheme.

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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