Reduction in the number of sensors.

I did a few tests by reducing the number of sensors in the SOM. This was accomplished by systematic sampling of the histograms. The results show that the reduction of sensors makes no significant difference to the number of iterations required to create a good map. A visual inspection of the memory fields shows almost no difference between the maps resulting from 128 and 768 sensors. The following plot shows the number of iterations (x) plotted against the number of associated memory locations (y):


Here are the memory fields of the 768 (top) and 128 (bottom) sensor training sessions: