Wrap tridiagonal methods from cuSPARSE

[RyanGutenkunst]

I've wrapped the methods for solving batch tridiagonal systems in cuSPARSE.

Unit tests are in tests/test_cusparse. The code has been put into production use on a Windows box at home and two Linux clusters, so it seems relatively robust.

My software dadi https://bitbucket.org/gutenkunstlab/dadi now (optionally) depends on this, so it would very much appreciate getting it merged into the distribution.

I could use feedback on the following.

1. I tried creating the appropriate file in docs to get the methods I implemented documented, but I'm getting a bunch of errors when I try to run Sphinx, and the docs aren't getting fully created. I'm not experience with Sphinx. Can anyone help with debugging that?

2. I removed the incomplete previously existing methods from cusparse.py . I don't know if that's preferred to keep the source clean, or whether I should put them back to preserve that incomplete work.

[RyanGutenkunst]

Bumping for visibility. Is @lebedov still actively maintaining this repository?

[RyanGutenkunst]

Hello @lebedov,
I'm about to submit a manuscript about our software using the newly wrapped library functions. (You can see the current draft here: https://www.overleaf.com/read/mrdcvpvxpshc .) I can move this support into my software itself, but I think it would be better for users if it lived in skcuda. Is there any chance of getting this pulled into the main skcuda distribution?
Thanks,
Ryan

[wingkitlee0]

@RyanGutenkunst Do you mind giving a list of functions you added?

[RyanGutenkunst]

The important ones I wrapped are cusparseSgtsv2StridedBatch, cusparseDgtsv2StridedBatch, cusparseSgtsvInterleavedBatch, and cusparseDgtsvInterleavedBatch. I also wrapped the corresponding functions for calculating buffer sizes.

[wingkitlee0]

Thanks! I helped you send Lev a message.. I previously contributed something to this repo but don't have permission to accept PR. Hope this do not block you anything.

[RyanGutenkunst]

Thanks Kit! I was able to pull the code into my own software, so it's not a big hold up for me now.