Avoid the error CURAND failure 201

You are probably running on a Pascal GPU (for example a GTX 1080) with CUDA 7.5. You need to upgrade to CUDA 8.0. Also you cannot use any of the provided CNTK binaries. All versions up to and including 1.7 are linked against CUDA 7.5 and will not work with Pascal GPUs.

TODO: list some helpful steps for people to transition from 7.5 to 8

Windows

You should set the environment variable CUDA_PATH_V8_0 and the environment variable CUDA_PATH

setx           CUDA_PATH "C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v8.0"
setx      CUDA_PATH_V8_0 "C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v8.0"