A hybrid swarm intelligence algorithm for simultaneous feature selection and clustering

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Hasan Geren MS Thesis.pdf

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2022-6-20

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Geren, Hasan

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In this study, we address the feature selection and clustering problems by using a hybrid swarm intelligence approach. We assume that the number of clusters is known, clusters can be of any shape and have different densities, but there are no outliers or noise. The data set may have high dimensionality and redundant features. We propose a swarm intelligence algorithm, namely ACOVNS, which is a hybridization of Ant Colony Optimization (ACO) and Variable Neighborhood Search (VNS). We utilize the ACO mechanisms for exploration and enhance its exploitation capability by combining it with VNS. In addition to pheromone values, we make use of some heuristic information to further improve the performance of the algorithm. In the first part of our study, we use our algorithm with an objective function based on the sum of Euclidean distances to solve the clustering problem. In the second part, we modify the ACOVNS algorithm as F-ACOVNS to perform feature selection and clustering simultaneously. We propose a novel heuristic information that employs the Laplacian Score (LS) and a second pheromone matrix for feature selection. Therefore, the algorithm selects features during clustering by using distinct pheromone matrices and heuristic information. Our proposed algorithms are unique in that ACOVNS is the first hybridization of ACO and VNS for clustering and F-ACOVNS is the first algorithm that uses LS as heuristic information. We compared the performance of ACOVNS with some well-known algorithms on nine real-world data sets. For simultaneous feature selection and clustering, we compared F-ACOVNS with known single and multi-objective algorithms using both real and synthetic data sets.

Subject Keywords

Clustering, Feature selection, Swarm intelligence, Ant colony optimization, Variable neighborhood search

URI

https://hdl.handle.net/11511/98094

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

H. Geren, “A hybrid swarm intelligence algorithm for simultaneous feature selection and clustering,” M.S. - Master of Science, Middle East Technical University, 2022.