Journal article

Growing Hierarchical Tree SOM: An unsupervised neural network with dynamic topology

Forti A, Foresti G ...see all

Neural Networks, vol. 19, issue 10 (2006) pp. 1568-1580

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Abstract

In this paper we introduce a tree structured self-organizing network, called the Growing Hierarchical Tree SOM (GHTSOM), that combines unsupervised learning with a dynamic topology for hierarchical classification of unlabelled data sets. The main feature of the proposed model is a SOM-like self-organizing process that allows the network to adapt the topology of each layer of the hierarchy to the characteristics of the training set. In particular the self-organization is obtained in two steps: the first one concerns the learning phase and is finalized with the creation of a tree of SOMs, while the second one is in regard to the clustering phase and provides the formation of classes for each level of the tree (hence self-organization not only for training but also for the creation of topological connections). As a result the network works without the need for user-defined parameters. Experimental results are proposed on both synthetic and real data sets. ?? 2006 Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • Clustering
  • Dynamic topology
  • Growing neural networks
  • Self-organization
  • Unsupervised learning

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Authors

  • Alberto Forti

  • Gian Luca Foresti

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