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The U-matrix representation

In this case, the U-matrix representation can be used to see if the SOM quantizes the input space evenly.

Figure 5.4: The U-matrix representation of the SOM

If there are no visible clusters, as is the case in Figure 5.4, the SOM quantizes the input space evenly, that is, the distances between the codebook vectors are approximately the same.

Jaakko Hollmen
Fri Mar 8 13:44:32 EET 1996