A novel hybrid K-harmonic means and gravitational search algorithm approach for clustering

Clustering is used to group data objects into sets of disjoint classes called clusters so that objects within the same class are highly similar to each other and dissimilar from the objects in other classes. K-harmonic means (KHM) is one of the most popular clustering techniques, and has been applied widely and works well in many fields. But this method usually runs into local optima easily. A hybrid data clustering algorithm based on an improved version of Gravitational Search Algorithm and KHM, called IGSAKHM, is proposed in this research. With merits of both algorithms, IGSAKHM not only helps the KHM clustering escape from local optima but also overcomes the slow convergence speed of the IGSA. The proposed method is compared with some existing algorithm on seven data sets, and the obtained results indicate that IGSAKHM is superior to KHM and PSOKHM in most cases. (C) 2011 Elsevier Ltd. All rights reserved.