Apples to oranges. The two APIs aren’t comparable, and being forced to use OpenCL is a hindrance itself. But unfortunately it has “Open” in the name so it must be better than that proprietary single vendor CUDA nonsense... /s
That would still be fine if OpenCL was similarly-performing on Intel/AMD and a 1st class citizen of various Deep Learning frameworks. OpenCL is just an afterthought there sadly.