Might want to look for video to Feb 22 lecture comparing caffe, theano, torch, TF: http://cs231n.stanford.edu/syllabus.html. It was taken down from youtube because no closed captions but i'm sure it's archived multiple places
https://mobile.nytimes.com/2015/02/13/education/harvard-and-...
So they took the easy way out and removed the videos.