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IEICE TRANSACTIONS on Information

A Simple and Faster Branch-and-Bound Algorithm for Finding a Maximum Clique with Computational Experiments

Etsuji TOMITA, Yoichi SUTANI, Takanori HIGASHI, Mitsuo WAKATSUKI

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Summary :

Many problems can be formulated as maximum clique problems. Hence, it is highly important to develop algorithms that can find a maximum clique very fast in practice. We propose new approximate coloring and other related techniques which markedly improve the run time of the branch-and-bound algorithm MCR (J. Global Optim., 37, pp.95–111, 2007), previously shown to be the fastest maximum-clique-finding algorithm for a large number of graphs. The algorithm obtained by introducing these new techniques in MCR is named MCS. It is shown that MCS is successful in reducing the search space quite efficiently with low overhead. Extensive computational experiments confirm the superiority of MCS over MCR and other existing algorithms. It is faster than the other algorithms by orders of magnitude for several graphs. In particular, it is faster than MCR for difficult graphs of very high density and for very large and sparse graphs, even though MCS is not designed for any particular type of graph. MCS can be faster than MCR by a factor of more than 100,000 for some extremely dense random graphs. This paper demonstrates in detail the effectiveness of each new techniques in MCS, as well as the overall contribution.

Publication
IEICE TRANSACTIONS on Information Vol.E96-D No.6 pp.1286-1298
Publication Date
2013/06/01
Publicized
Online ISSN
1745-1361
DOI
10.1587/transinf.E96.D.1286
Type of Manuscript
PAPER
Category
Fundamentals of Information Systems

Authors

Etsuji TOMITA
  The University of Electro-Communications,JST ERATO Minato Discrete Structure Manipulation System Project,Tokyo Institute of Technology
Yoichi SUTANI
  The University of Electro-Communications,Sony Corporation
Takanori HIGASHI
  The University of Electro-Communications,Japan Systems Co., Ltd.
Mitsuo WAKATSUKI
  The University of Electro-Communications,The University of Electro-Communications

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