Great stuff to see that Google is releasing their own tools for research and production systems. Does anybody have a grasp of the main differences between the t

Great stuff to see that Google is releasing their own tools for research and production systems. Does anybody have a grasp of the main differences between the triple Ts: Tensorflow, Theano and Torch? As far as I can see Theano and Tensorflow support dataflow-like computations, automatic differentiation and GPU support via CUDA. Finally, why didn't Google, The Lisa Lab and Facebook worked together on building a unique library instead of three?