How do I make a U-matrix?
问题 How exactly is an U-matrix constructed in order to visualise a self-organizing-map? More specifically, suppose that I have an output grid of 3x3 nodes (that have already been trained), how do I construct a U-matrix from this? You can e.g. assume that the neurons (and inputs) have dimension 4. I have found several resources on the web, but they are not clear or they are contradictory. For example, the original paper is full of typos. 回答1: A U-matrix is a visual representation of the distances