GPU example

[mehrhardt]

This is not really an issue with the code, rather its documentation. I want to start using ODL with GPUs but I could not find anything to get going. I only found one line in the documentation saying that it is possible but not how ...

[kohr-h]

This is one big chunk of work in progress. If you feel like experimenting a bit you can have a look at #739 but work there is not quite complete. The PR belongs to #861 and will go in as one big chunk before we head towards ODL 1.0. I work on it every now and then, but there are still some things to fix until it's ready.

In the meanwhile maybe @adler-j can give you some instructions on how to do things with our current GPU backend.

[adler-j]

The current GPU backend is in a sorry state since no-one has been using it for quite a while (we're all waiting for the famous tensors). With that said, they would be working.

To install it, you need to install the odlcuda package, after which you can simply use impl='cuda' in rn, uniform_discr, etc. Most things should work as you expect, but speedups will vary. Once tensors are in speedups should improve noticably.