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Just as a point of interest, is there any limitation to supporting CUDA on AMD hardware (were this to be compiled with the AMDGPU backend)? With the obvious lack of libraries, etc.

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AMD's new Boltzmann initiative includes an LLVM-based compiler which has been posted online. I'm not sure what are the plans around an OpenCL fronted, but the backend should be there, so I think an OpenCL support in LLVM for AMD GPUs could be a realistic goal.

http://gpuopen.com/compute-product/hcc-heterogeneous-compute... https://github.com/RadeonOpenCompute/hcc

The Tensorflow code mentions "GCUDACC" in several places, and from the surrounding comments it seems to be targeted at OpenCL as well as CUDA. So it seems that this has been at least considered.

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