Csáji, Balázs Csanád and Jungers, Raphaël and Blondel, Vincent (2014) PageRank Optimization by Edge Selection. Discrete Applied Mathematics, 169. pp. 7387.
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Abstract
The importance of a node in a directed graph can be measured by its PageRank. The PageRank of a node is used in a number of application contexts – including ranking websites – and can be interpreted as the average portion of time spent at the node by an infinite random walk. We consider the problem of maximizing the PageRank of a node by selecting some of the edges from a set of edges that are under our control. By applying results from Markov decision theory, we show that an optimal solution to this problem can be found in polynomial time. Our core solution results in a linear programming formulation, but we also provide an alternative greedy algorithm, a variant of policy iteration, which runs in polynomial time, as well. Finally, we show that, under the slight modification for which we are given mutually exclusive pairs of edges, the problem of PageRank optimization becomes NPhard.
Item Type:  Article 

Subjects:  Q Science / természettudomány > QA Mathematics / matematika > QA75 Electronic computers. Computer science / számítástechnika, számítógéptudomány 
Depositing User:  Dr. Balázs Csanád Csáji 
Date Deposited:  15 Sep 2014 20:57 
Last Modified:  15 Sep 2014 20:57 
URI:  http://real.mtak.hu/id/eprint/15062 
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