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Poster
Scalable Influence Estimation in Continuous-Time Diffusion Networks
Nan Du · Le Song · Manuel Gomez Rodriguez · Hongyuan Zha

Fri Dec 06 07:00 PM -- 11:59 PM (PST) @ Harrah's Special Events Center, 2nd Floor
in Poster Session »
If a piece of information is released from a media site, can it spread, in 1 month, to a million web pages? This influence estimation problem is very challenging since both the time-sensitive nature of the problem and the issue of scalability need to be addressed simultaneously. In this paper, we propose a randomized algorithm for influence estimation in continuous-time diffusion networks. Our algorithm can estimate the influence of every node in a network with $|\Vcal|$ nodes and $|\Ecal|$ edges to an accuracy of $\epsilon$ using $n=O(1/\epsilon^2)$ randomizations and up to logarithmic factors $O(n|\Ecal|+n|\Vcal|)$ computations. When used as a subroutine in a greedy influence maximization algorithm, our proposed method is guaranteed to find a set of nodes with an influence of at least $(1 - 1/e)\operatorname{OPT} - 2\epsilon$, where $\operatorname{OPT}$ is the optimal value. Experiments on both synthetic and real-world data show that the proposed method can easily scale up to networks of millions of nodes while significantly improves over previous state-of-the-arts in terms of the accuracy of the estimated influence and the quality of the selected nodes in maximizing the influence.
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Author Information

Nan Du (Georgia Tech)
Le Song (Georgia Institute of Technology)
Manuel Gomez Rodriguez (Max Planck Institute for Software Systems)
Hongyuan Zha (Georgia Tech)

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