Tinker with a neural network in your browser. It’s a technique for building a computer program that learns from data. It is based very loosely on how we think the human brain works. site 
Orange and blue are used throughout the visualization in slightly different ways, but in general orange shows negative values while blue shows positive values.
TensorFlow™ is an open source software library for numerical computation using data flow graphs. Originally developed by researchers and engineers working on the Google Brain Team, the system is general enough to be applicable in a variety of other domains as well. site
See also google's SyntaxNet in Tensorflow. post
Tensorflow sucks. post