Ch. 2 of my free online book about neural nets and deep learning now available: http://neuralnetworksanddeeplearning.com/chap2.html Covers backpropagation in depth.
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@michael_nielsen convnetjs and for network drawing trying canvas, svg or just html elements. Id love your input once it's fleshed out a bit!
@karpathy I've been playing around with both d3 and paper.js for visualizing networks in a variety of ways. I particularly like paper.js
