Unpin igraph version

[johandahlberg]

Description

This PR allows the igraph dependency to vary in the patch version. This will make it easier to build working conda recipes.

To make this work we have to explicitly add the vertices when creating the graph. This seems (as far as I've been able to tell) to be an undocumented change in how the igraph APIs work.

In addition unpinning the igraph dependency I've removed some unused data that caused warnings in the tests.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

This has been tested with the unit test suite.

[szhorvat]

This seems (as far as I've been able to tell) to be an undocumented change in how the igraph APIs work.

Can you clarify what you are referring to?

Are you looking for the use_vids=False parameter of Graph.DataFrame?

https://python.igraph.org/en/stable/api/igraph.Graph.html#DataFrame

The default changed to True in python-igraph 0.10.0, see https://github.com/igraph/python-igraph/blob/main/CHANGELOG.md#0100---2022-09-05

[johandahlberg]

@szhorvat We've been usinguse_vids=False previously, so I don't think it's that: https://github.com/PixelgenTechnologies/pixelator/pull/4/files#diff-98ab30b9ad4a777bbe400bfd140d50981a41d13c8ef6869ceac155a24b681716L65 The only way that I could get our test suite to pass was to add vertices=.... It's quite possible I'm missing something here, though.

Thank you for pitching in! If you have an other theories about what's going on here I'd be happy to hear them. And a big welcome as the first external contributor in Pixelator community!

[szhorvat]

When vertices are not provided, igraph does basically the same thing as what you did in this PR, see

https://github.com/igraph/python-igraph/blob/main/src/igraph/io/objects.py#L462

If you notice any difference (other than vertex ordering) between two graphs constructed with and without providing such a vertices parameter, please report it to igraph.

[johandahlberg]

Thank you! I will look in to it and see if I can construct a minimal example that replicates the behavior.