Neural networks are a beautiful concept. They are also beautiful to watch. I created an interactive neural network visualizer and tutorial. It’s a fun way to develop some intuition about neural nets. It was created using vis.js, and a lot of love. Hope you enjoy!
The source code is now up on github. <a href="https://github.com/mcrowe/neurovis" rel="nofollow">https://github.com/mcrowe/neurovis</a>
That's fun, but the whole point of neural networks is to train them against data, not tweak the weights by hand. Hand-tuning a neural network is not done much - it's like setting raw filter parameters by hand.