New options handling

[inducer]

NB: This currently fails to import with

/usr/lib/python3.9/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
test_metis.py:28: in <module>
    import pymetis
../pymetis/__init__.py:28: in <module>
    from pymetis._internal import Options
E   ImportError: AttributeError: NUMBERING

when exactly the same method seems to work OK in PyOpenCL:

https://github.com/inducer/pyopencl/blob/0195ba6ab8d5fefddf8907820120c9db2c312527/src/wrap_constants.cpp#L156-L179

[nishraptor]

What can I do to help with this? I was planning on just adding a seed option like the other options, but this would be a good solution to add any options. I've pulled the branch but not sure how I can help

[inducer]

I think the task now would be to actually get it to work: expose the option constants and fix the options passing of the functions to use this new mechanism, update the docs, and add some tests. Do this, or some part of it, stick it in a PR, and I'd call that progress.

[nhartland]

I had a shot at understanding the error here but didn't make any progress. Is it even clear where exactly that AttributeError is thrown?

[inducer]

Thanks for giving this a look. I believe the error is being thrown from this line, specifically the .attr in this macro.

[nhartland]

That part seems to compile fine though. I tried rewriting it a few different ways (with/without macro) to no effect. Indeed removing it stops the error on import though.

I was thinking that the error is thrown somewhere in the python side, but couldn't track down exactly where the raise AttributeError is.

[inducer]

I think I made some progress. af76cad gets option setting/getting to work AFAICT.

[nhartland]

Seems to work! Thanks! I can have a shot at wiring up the options and testing them.

What would be the mechanism for passing the pymetis.Options python object back to C++? Something like adding a const py::object &options_py to the signature of wrap_part_graph and then casting back to a metis_options class with py::cast or is there a simpler way?

[inducer]

See 406d0f4.

[inducer]

Superseded by #31, I think.