Fig. 3.11. “The Magic TV” (a) System (b) Output Plane. Pairs of letters correspond to processing units, labeled by the images of test vectors (with coordinates defined in (c)). (c) Input Plane showing those points to which the various processing units (corresponding to nodes of the net) have become most sensitive
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KOHONEN, Teuvo, 1995. Self-organizing maps. Berlin ; New York: Springer. Springer series in information sciences, 30. ISBN 978-3-540-58600-5, p. 90