Demo broken with latest COLMAP release

[kocurvik]

Since the release of COLMAP 3.11.0 the demo does not work. An error occurs when the method hloc.localize_sfm.pose_from_cluster is called. Internally, it calls pycolmap.absolute_pose_estimation which was removed in the latest COLMAP release and replaced with estimate_and_refine_absolute_pose.

A quick fix is to specify the older COLMAP version during the initial pip installs in the demo: !pip install pycolmap==3.10. I guess ideally it would be better to update the relevant calls within hloc.

Note that I found that once pycolmap is installed in Colab, downgrading it or uninstalling it using pip within the notebook does not seem to work for some reason.

[NhatUS03]

I think the best approach currently is to create your own repository and fork it from the original. Then update it to follow the PYCOLMAP version 3.11.0. In the Colab notebook, simply replace the URL with your repository's URL.