Simple Neural Network can't learn XOR

Question

I\'m trying to learn about neural networks and coded a simple, back-propagation, neural network that uses sigmoid activation functions, random weight initialization, and learnin

Answer 1

If you want to consider Neuroevolution, you may check up the neuroevo gem. Run the specs to see it fit XOR in 15 iterations ([2,2,1] feed-forward network, XNES optimizer):

https://github.com/giuse/neuroevo/blob/master/spec/solver_spec.rb

Full disclosure: I'm the developer (hi there!).
I just recently began published my code and am looking for feedback.