Generative probability density model in the self-organizing map

  • Authors:
  • Jouko Lamppinen;Timo Kostiainen

  • Affiliations:
  • Helsinki Univ. of Technology, Finland;Helsinki Univ. of Technology, Finland

  • Venue:
  • Self-Organizing neural networks
  • Year:
  • 2001

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Abstract

The Self-Organizing Map, SOM, is a widely used tool in exploratory data analysis. A theoretical and practical challenge in the SOM has been the difficulty to treat the method as a statistical model fitting procedure. In this chapter we give a short review of statistical approaches for the SOM. then we present hte probability density model for which the SOM training gives the maximum likelihood estimate. The density model can be used to choose the neighborhood width of the SOM so as to avoid overfitting and to improve the reliability of the results. The density model also gives tools for systematic analysis of teh SOM. A major application of teh SOM is the analysis of dependencies between variables. We discuss some difficulties in the visual analysis of the SOM and demonstrate how quantitative analysis of the dependencies between variables. We discuss some difficulties in the visual analysis of the SOM and demonstrate how quantitative analysis of the dependencies can be carried out by calculating conditional distributions from the density model.