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Note that when only the winning unit is allowed to learn (i.e. R=0) the patterns group themselves together into a small number of clusters. For example, for the case where R=0 initially, A1, A2 and A3 are grouped together in unit 11, B1 and B3 are both in unit 2 while B2 is in unit 25.For the case where initially R=1, where neighboring units are learning, the units are linked now topologically. That is, like patterns may wind up in adjacent rather than the same cluster. More cluster units are used as compared to the R=0 case. However, we see a high degree of clustering in that the three fonts of letters A, C, J, and K are in the same unit or in units close together. Two of the three fonts of the other letters are close together as well, so the results are not too different than for the case where only the winning unit learns.Another MATLAB routine was written which attempt to organize these same character patterns into a two-dimensional rectangular array of cluster units. Here the 25 cluster units are set up as a square 5x5 arrayA sample output of this program after 100 epochs is shown below.
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