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Multilevel Graph Clustering with Density-Based Quality Measures

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Contents3.5.2 Data Management . . . . . . . . . . . . . . . . . . . . . . . . 564 Evaluation 594.1 Methods and Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 594.1.1 Configuration Space . . . . . . . . . . . . . . . . . . . . . . . 594.1.2 Effectiveness . . . . . . . . . . . . . . . . . . . . . . . . . . . 614.1.3 Efficiency and Scalability . . . . . . . . . . . . . . . . . . . . 634.2 Effectiveness of the <strong>Graph</strong> Coarsening . . . . . . . . . . . . . . . . . 644.2.1 Match Fraction . . . . . . . . . . . . . . . . . . . . . . . . . . 644.2.2 Coarsening Methods . . . . . . . . . . . . . . . . . . . . . . . 654.2.3 Reduction Factor . . . . . . . . . . . . . . . . . . . . . . . . . 674.3 Effectiveness of the Merge Selectors . . . . . . . . . . . . . . . . . . . 674.3.1 Random Walk Distance . . . . . . . . . . . . . . . . . . . . . 674.3.2 Random Walk Reachability . . . . . . . . . . . . . . . . . . . 694.3.3 Comparison of Merge Selectors . . . . . . . . . . . . . . . . . 704.4 Effectiveness of the Cluster Refinement . . . . . . . . . . . . . . . . . 724.4.1 Greedy Refinement . . . . . . . . . . . . . . . . . . . . . . . . 734.4.2 Kernighan-Lin Refinement . . . . . . . . . . . . . . . . . . . . 744.5 Scalability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 754.6 Comparison to Reference Algorithms . . . . . . . . . . . . . . . . . . 764.7 Comparison to Published Results . . . . . . . . . . . . . . . . . . . . 794.7.1 The <strong>Graph</strong>s and <strong>Clustering</strong>s . . . . . . . . . . . . . . . . . . . 794.7.2 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 855 Results and Future Work 875.1 Results of this Work . . . . . . . . . . . . . . . . . . . . . . . . . . . 875.2 By-Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 885.3 Directions for Future Work . . . . . . . . . . . . . . . . . . . . . . . 895.3.1 Pre-Coarsening . . . . . . . . . . . . . . . . . . . . . . . . . . 895.3.2 Study of Merge Selectors . . . . . . . . . . . . . . . . . . . . 905.3.3 Linear Programming . . . . . . . . . . . . . . . . . . . . . . . 905.3.4 Multi-Pass <strong>Clustering</strong> and Randomization . . . . . . . . . . . 905.3.5 High-Level Refinement Search . . . . . . . . . . . . . . . . . . 90Bibliography 93A The Benchmark <strong>Graph</strong> Collection 99B <strong>Clustering</strong> Results 101VI

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