Multiview training / other dataset preprocessing

[kwonyoung9120]

Thanks for your great work and for releasing the code!
When I run uv run python src/run_multi.py, it seems the validation requires val_pair_8views.json. Could you provide the validation pair list, or guide me on how to generate it?
Also, would it be possible to share the preprocessing code for ScanNet? It would be really helpful for applying SIU3R to other datasets such as ScanNet++, Replica, or custom datasets.