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Lisa Elkin(laelkinuwaterloo.ca) Abstract: We consider the problem of maximizing influence in a social network. We focus on the case that the social network is a directed bipartite graph whose arcs join senders to receivers. We consider both the case of deterministic networks and probabilistic graphical models, that is, the socalled ``cascade'' model. The problem is to find the set of the $k$ most influential senders for a given integer $k$. Although this problem is NPhard, there is a polynomialtime approximation algorithm due to Kempe, Kleinberg and Tardos. In this work we consider convex relaxation for the problem. We prove that convex optimization can recover the exact optimizer in the case that the network is constructed according to a generative model in which influential nodes are planted but then obscured with noise. We also demonstrate computationally that the convex relaxation can succeed on a more realistic generative model called the ``forest fire'' model. Keywords: convex relaxation, social network, influence Category 1: Convex and Nonsmooth Optimization (Convex Optimization ) Category 2: Applications  Science and Engineering (DataMining ) Citation: Download: [PDF] Entry Submitted: 07/15/2013 Modify/Update this entry  
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