Plotting weighted mean activations
Plotting graded activations
Training individual maps
Training more individual maps
Hebbian training on non-symmetric maps
References for SOMs

Two data sets: five groups each

In this data set, there are five groups on both the left and right side, and a one-to-one correspondence between the groups. Here is a chart of the data, where the colors show the correspondence between maps that will be learned by Hebbian connections. I'm sorry the colors are hard to see; on the left map, start at the top left side of the pentagon, this corresponds to the bottom group on the right map. As you move clockwise around the pentagon, move up one group on the right plot.
The black dots and the lines represent the neurons and how they are connected. More on that here if you're interested. The maps have been trained on each data set independently, so you can see that they approximate the layout of the datapoints.

As before, we train the Hebbian connections by presenting associated data points to the two maps and make note of which neurons are activated at the same time. In the following five 2x2 charts, the post-training response to data presentation is shown. Five points, one from each region of the maps, are presented and activation on the opposite map is graphed gradiently.

Points from group 1:

Points from group2:

Points from group3:

Points from group4:

Points from group5: