Research Article

Two lagrangian relaxation based heuristics for vertex coloring problem

Volume: 41 Number: 2 June 25, 2020
EN

Two lagrangian relaxation based heuristics for vertex coloring problem

Abstract

Vertex coloring problem is a well-known NP-Hard problem where the objective is to minimize the number of colors used to color vertices of a graph ensuring that adjacent vertices cannot have same color. In this paper, we first discuss existing mathematical formulations of the problem and then consider two different heuristics, namely HEUR-RA and HEUR-RC, based on Lagrangian relaxation of adjacency and coloring constraints. HEUR-RA does not require solving any optimization problem through execution whereas at each iteration of HEUR-RC another NP-Hard problem, maximal weight stable set problem, is solved. We conduct experiments to observe computational performances of these heuristics. The experiments reveal that although it requires longer running times, HEUR-RC outperforms HEUR-RA since it provides lower optimal gaps as well as upper bound information.

Keywords

References

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Details

Primary Language

English

Subjects

-

Journal Section

Research Article

Publication Date

June 25, 2020

Submission Date

October 2, 2019

Acceptance Date

June 15, 2020

Published in Issue

Year 2020 Volume: 41 Number: 2

APA
Mahmutoğulları, A. İ. (2020). Two lagrangian relaxation based heuristics for vertex coloring problem. Cumhuriyet Science Journal, 41(2), 493-505. https://doi.org/10.17776/csj.628518

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