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I recall hearing that CUDA has much more mature tooling. Not only the already mentioned cuDNN, but the CUDA Toolkit [0] seems like a really comprehensive set of tools and libraries to help you with pretty much anything you might want to compute on a GPU.

Also somewhat related: AMD seems to be moving towards supporting CUDA on its GPUs in the future: http://www.amd.com/en-us/press-releases/Pages/boltzmann-init...

[0] https://developer.nvidia.com/cuda-toolkit

On closer inspection, it looks like AMD's CUDA support consists of "run these tools over your code and it will translate it so your code does not depend on CUDA"...

Its sort of supporting CUDA, just like a car ferry sort of lets your car 'drive' across a large body of water.

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