som_make - SOM Toolbox Online documentation

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SOM Toolbox Online documentation http://www.cis.hut.fi/projects/somtoolbox/ som_make Purpose Creates, initializes and trains a SOM using default parameters. Syntax sMap = som_make(D); sMap = som_make(. ..,'argID',value,. ..); sMap = som_make(. ..,value,. ..); Description Creates, initializes and trains a SOM with default parameters. Uses functions SOM_TOPOL_STRUCT, SOM_TRAIN_STRUCT, SOM_DATA_STRUCT and SOM_MAP_STRUCT to come up with the default values. First, the number of map units is determined. Unless they are explicitly defined, function SOM_TOPOL_STRUCT is used to determine this. It uses a heuristic formula of 'munits = 5*dlen^0.54321'. The 'mapsize' argument influences the final number of map units: a 'big' map has x4 the default number of map units and a 'small' map has x0.25 the default number of map units. After the number of map units has been determined, the map size is determined. Basically, the two biggest eigenvalues of the training data are calculated and the ratio between sidelengths of the map grid is set to this ratio. The actual sidelengths are then set so that
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This note was uploaded on 05/23/2010 for the course CS 245 taught by Professor Dunno during the Spring '10 term at Aarhus Universitet.

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som_make - SOM Toolbox Online documentation

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