2IBGSOM: interior and irregular boundaries growing self-organizing maps

In this paper, we introduce a new variant of growing self-organizing maps (GSOM) based on Alahakoon's algorithm for SOM training; so called 2IBGSOM (interior and irregular boundaries growing self-organizing maps). It's dynamically evolving structure for SOM, which allocates map size and shape during the unsupervised training process. 2IBGSOM starts with a small number of initial nodes and generates new nodes from the boundary and the interior of the network. 2IBGSOM represents the structure of the training data as accurately as possible. Our proposed method was tested on real world databases and showed better performance than the classical SOM and the growing grid (GG) algorithms. Three criteria were used to compare the above algorithms with our proposed method; the quantization error; the topological error and the labeling error to have more accuracy on the produced structure. Results report that 2IBGSOM shows a very good capacity of estimation for the training data based on the three tested factors.

[1]  Bernd Fritzke,et al.  A Growing Neural Gas Network Learns Topologies , 1994, NIPS.

[2]  Hujun Yin,et al.  Adaptive topological tree structure for document organisation and visualisation , 2004, Neural Networks.

[3]  Bala Srinivasan,et al.  Dynamic self-organizing maps with controlled growth for knowledge discovery , 2000, IEEE Trans. Neural Networks Learn. Syst..

[4]  Kate Smith-Miles,et al.  HDGSOM: a modified growing self-organizing map for high dimensional data clustering , 2004, Fourth International Conference on Hybrid Intelligent Systems (HIS'04).

[5]  T. Villmann,et al.  Topology Preservation in Self-Organizing Maps , 1999 .

[6]  Bernd Fritzke,et al.  Growing cell structures--A self-organizing network for unsupervised and supervised learning , 1994, Neural Networks.

[7]  Risto Mukkulainen,et al.  Script Recognition with Hierarchical Feature Maps , 1990 .

[8]  Catherine Blake,et al.  UCI Repository of machine learning databases , 1998 .

[9]  Andreas Rauber,et al.  The growing hierarchical self-organizing map , 2000, Proceedings of the IEEE-INNS-ENNS International Joint Conference on Neural Networks. IJCNN 2000. Neural Computing: New Challenges and Perspectives for the New Millennium.

[10]  Bernd Fritzke.  Growing Grid — a self-organizing network with constant neighborhood range and adaptation strength , 1995, Neural Processing Letters.

[11]  T. Kohonen.  Self-organized formation of topology correct feature maps , 1982 .