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Clustering the SOM

While the weight vectors of the SOM are themselves cluster centers, even better results can be achieved by combining map units to form bigger clusters. A significant advantage with this method is that while the Voronoi regions of the map units are convex, the combination of several map units allows the construction of non-convex clusters. Different kinds of distance measures and joining criteria can be utilized to form the big clusters.

Juha Vesanto
Tue May 27 12:40:37 EET DST 1997