Abstract
Bipartite graphs, which consist of two different types of entities, are widely used to model many real-world applications. In bipartite networks, (α,β)-core is an essential model to measure the entity engagement. In this paper, we propose and investigate the problem of (α,β)-core minimization, which aims to identify a set of b edges whose deletion can minimize the size of resulting collapsed (α,β)-core. To our best knowledge, this is the first work to investigate the (α,β)-core minimization problem in bipartite graph. We prove the problem is NP-hard and our object function is monotonic but not submodular. Then, we propose a baseline algorithm by invoking the greedy framework. To reduce the computation cost and candidate space, novel pruning techniques are devised. We further develop a group based algorithm to optimize the search. Finally, we conduct comprehensive experiments over 6 real-life bipartite networks to demonstrate the advantages of the proposed techniques.
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This work is support by NSFC 61802345, ZJNSF LQ20F020007, ZJNSF LY21F020012 and Y202045024.
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This article belongs to the Topical Collection: Special Issue on Large Scale Graph Data Analytics Guest Editors: Xuemin Lin, Lu Qin, Wenjie Zhang, and Ying Zhang
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Chen, C., Zhu, Q., Wu, Y. et al. Efficient critical relationships identification in bipartite networks. World Wide Web 25, 741–761 (2022). https://doi.org/10.1007/s11280-021-00914-2
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DOI: https://doi.org/10.1007/s11280-021-00914-2