File:SOM versus GSOM.png

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English: Approximation of a spiral with noise by SOM (the upper row) and GSOM (the lower row) with 50 (the first column) and 100 (the second column) nodes. The Fraction of variance unexplained is: a) 4.68% (SOM, 50 nodes); b) 1.69% (SOM, 100 nodes); c) 4.20% (GSOM, 50 nodes); d) 2.32% (GSOM, 100 nodes. The initial approximation for SOM was equidistribution of nodes in a segment on the first principal component with the same variance as for the data set. The initial approximation for GSOM was the mean point. Illustration is prepared using free software: E.M. Mirkes, Principal Component Analysis and Self-Organizing Maps: applet. University of Leicester, 2011. This applet is published under cc Attribution 3.0 unported license.
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Author Agor153

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current21:40, 10 May 2012Thumbnail for version as of 21:40, 10 May 20121,248 × 859 (145 KB)Agor153 (talk | contribs)

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