Errors during import matchers

[Vincentqyw]

Hi @gmberton

First of all, thank you for your excellent work on vismatch! It is a great library.

I am currently trying to integrate vismatch into image-matching-webui.I am encountering errors when loading the models. While loftr loads successfully, subsequent attempts to import se2loftr, xoftr, ASpanFormer, and MatchAnything fail.

Here are the details:
Vincentqyw/image-matching-webui#155 (comment)

Thank you again for your time and help!

[gmberton]

Hi @Vincentqyw, great to hear from you!

I spent some time on it and I think I found a good solution. I made a PR (#62) which should work fine. Could you take a look? I'll wait for some feedback from you and @alexstoken before merging it

Sorry for the delay, I'm busy with my new job and Alex is busy with Artemis II ;)

[Vincentqyw]

Hi @gmberton, thanks for the fix! I've tested PR #62 and can confirm it resolves the import collision issue. The add_to_path() flush approach is clean and works well.

Beyond imports, I also hit runtime errors on non-CUDA devices (Apple MPS) — hard assert crashes, LighterGlue's hardcoded CUDA deps, and a global LightGlue.default_conf mutation that breaks other LightGlue-based matchers. These only surface after imports succeed.

I've submitted PR #64 on top of your patch to address these: replacing hard assertions with warnings, fixing LighterGlue init for non-CUDA devices, and adding AMP/device compatibility fixes. Would appreciate your feedback!

No rush — congrats on the new job again:)