Issue No. 06 - June (2018 vol. 30)
Guanfeng Liu , School of Computer Science and Technology, Soochow University, Suzhou, Jiangsu, China
Yi Liu , School of Computer Science and Technology, Soochow University, Suzhou, Jiangsu, China
Kai Zheng , University of Electronic Science and Technology, China
An Liu , School of Computer Science and Technology, Soochow University, Suzhou, Jiangsu, China
Zhixu Li , School of Computer Science and Technology, Soochow University, Suzhou, Jiangsu, China
Yang Wang , Department of Computing, Macqaurie University, Sydney, NSW, Australia
Xiaofang Zhou , School of Information Technology and Electrical Engineering, The University of Queensland, St Lucia, QLD, Australia
Graph Pattern Matching (GPM) has been used in lots of areas, like biology, medical science, and physics. With the advent of Online Social Networks (OSNs), recently, GPM has been playing a significant role in social network analysis, which has been widely used in, for example, finding experts, social community mining, and social position detection. Given a query which contains a pattern graph
and a data graph $_$G_Q$_$ , a GPM algorithm finds those subgraphs, $_$G_D$_$ , that match $_$G_M$_$ in $_$G_Q$_$ . However, the existing GPM methods do not consider the multiple end-to-end constraints of the social contexts, like social relationships, social trust, and social positions on edges in $_$G_D$_$ , which are commonly found in various applications, such as crowdsourcing travel, social network based e-commerce, and study group selection, etc. In this paper, we first conceptually extend Bounded Simulation to $_$G_Q$_$ Multi-Constrained Simulation (MCS), and propose a novel NP-Complete Multi-Constrained Graph Pattern Matching (MC-GPM) problem. Then, to address the efficiency issue in large-scale MC-GPM, we propose a new concept called Strong Social Component (SSC), consisting of participants with strong social connections. We also propose an approach to identifying SSCs, and propose a novel index method and a graph compression method for SSC. Moreover, we devise a multithreading heuristic algorithm, called M-HAMC, to bidirectionally search the MC-GPM results in parallel without decompressing graphs. An extensive empirical study over five real-world large-scale social graphs has demonstrated the effectiveness and efficiency of our approach.
Pattern matching, Indexes, Data models, Social network services, Context modeling, Time complexity, Computational modeling
G. Liu et al., "MCS-GPM: Multi-Constrained Simulation Based Graph Pattern Matching in Contextual Social Graphs," in IEEE Transactions on Knowledge & Data Engineering, vol. 30, no. 6, pp. 1050-1064, 2018.