[moconnor]

For this simple example just choosing the largest possible fully-connected network with ReLU and L2 regularization to prevent overfit quickly converges to a nice spiral (test loss of 0.001 for me):

http://playground.tensorflow.org/#activation=relu&regulariza...

[findthewords]

I wouldn't call it quick... spiral in 150 iterations, with sigmoid magic: http://playground.tensorflow.org/#activation=sigmoid&regular...

I find the pulsating unsightly.

[amelius]

Neat. How would the number of neurons N scale with the size of the spiral? (Size=number of turns)

Will N level off, meaning that it will really understand the structure of the spiral?