Sierra 10.12.6
Cuda not found is the message I get when I run The CudaZ test app.
I have tried two versions of Cuda 8.0.90 and 9.0.197, both install with no issues, but still get the not found message.
When I boot into 10.12.6 (Sierra) with Cuda Driver 9.0.197 Cuda-Z works for me. I'm currently running High Sierra, 10.13 supp. 1. Cuda Driver 9.0.197 does not work in High Sierra, but Driver 8.0.90 works with Cuda-Z. It has been tested by others: