[binaryzeitgeist]

What surprised me in the first place is why Tensorflow an "OpenSource" initiative by Google chose proprietary CUDA over "OpenSource" OpenCL.

Check Tensorflow issue 22 for more info.

Just sayin.

[solomatov]

CUDA is superior to OpenCL. Also NVIDIA provides CuDNN, a proprietary library with very efficient implementation of deep learning primitives. If you want to train models faster, you have to use them.