[ginko]

Well mainly because Nvidia gimped their OpenCL drivers and there was no customer pushback.

[pjmlp]

OpenCL vendors never provided a competing tooling alternative to CUDA.

Drivers are only part of the story.

Even Google preferred to create their own Renderscript dialect than supporting OpenCL.

[bitL]

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.