Error when using af.set_backend('cuda')

[funcwj]

When I try to switch backend using af.set_backend('cuda'), I got error like:

It seems that I do not have cuda devices as candiated backend although I have 8 gpus in fact, and the output of af.info()

In [2]: af.info()
ArrayFire v3.6.2 (CPU, 64-bit Linux, build dc38ef1)
[0] Intel: Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz, 257588 MB, Max threads(44) 

and af.get_backend()

In [2]: af.get_backend()
Out[2]: 'unified'

So does I missing something when installing the package?

[mark-poscablo]

Hi @funcwj, do you have the arrayfire CUDA libraries on the directory you added to LD_LIBRARY_PATH? Also, could you check if you added the CUDA and CUDA NVVM lib directories to LD_LIBRARY_PATH? (Please see the wiki for more information about setting the environment variables)

I am running Ubuntu 18.04, and I have these in the same directory that I have the CPU, OpenCL, and Unified backend libraries. Please check if they are there for you:

libafcuda.so
libafcuda.so.3
libafcuda.so.3.7.0

(Note that it says 3.7.0 there because I've built these from source - we haven't released 3.7.0 yet)