The Stilwell Brain

This comes from [the video](https://www.youtube.com/watch?v=rA5qnZUXcqo&pbjreload=10) by Vsauce. I know you've already made mnist classification example, but this is quite different. The idea is creating a neural network model with 5 layers almost like it is in a human brain: retina, v1, v2, v4 and IT-layer.

* Retina receives inputs (pixels of handwritten digit)
* V1 neurones are sensitive to lines, which means that a neurone fires if three of retina layers make a line
* V2 neurones are sensitive to angles
* V4 are sensitive to shapes
* IT is pretty much like an output softmax layer

I think this algorithm is worth implementing because it gives deep understanding of how human brain works and how it is related to artificial neural networks.

Inizia esaminando l'esempio esistente di classificazione MNIST nel repository, quindi usa il video Vsauce collegato per chiarire i livelli proposti retina, V1, V2, V4 e IT. Il lavoro sarebbe considerato completato con un'implementazione documentata del modello a cinque livelli per cifre scritte a mano, ma questo issue non indica file, test o criteri di accettazione concreti.

Scritto dal modello di indicizzazione a partire dal testo della issue.