Teuvo Kohonen shows us how Neural Networks work 1988. "Matrix of learning vectors" demonstrated with rotating disks. Semi-comprehensible at that time. https://youtu.be/Qy3h7kT3P5I?t=2479
I fondly remember using a self organizing map and using it to disastrous effect during a brief stint at automated day trading. I always think of it as having paid a couple grand to learn about SOM and how to layer neural networks.
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[ 3.5 ms ] story [ 11.8 ms ] threadhttps://en.m.wikipedia.org/wiki/Self-organizing_map
He was a clear and innovative thinker. R.I.P.