Clustering Properties of Hierarchical Self-Organizing Maps

  • Jouko Lampinen
  • Erkki Oja


A multilayer hierarchical self-organizing map (HSOM) is discussed as an unsupervised clustering method. The HSOM is shown to form arbitrarily complex clusters, in analogy with multilayer feedforward networks. In addition, the HSOM provides a natural measure for the distance of a point from a cluster that weighs all the points belonging to the cluster appropriately. In experiments with both artificial and real data it is demonstrated that the multilayer SOM forms clusters that match better to the desired classes than do direct SOM’s, classical k-means, or Isodata algorithms.

Key words

cluster analysis self-organizing maps neural networks 


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Copyright information

© Springer Science+Business Media New York 1993

Authors and Affiliations

  • Jouko Lampinen
    • 1
  • Erkki Oja
    • 1
  1. 1.Department of Information TechnologyLappeenranta University of TechnologyLappeenrantaFinland

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