some problems about sixd.py

[helloyuning]

As title, when I tried to load sixd data I met some problems.

You load sixd data from 'gt.yml'(Is it from scene_gt.json?) In sixd.py, and this code: fr.gt.append((gt['obj_id'], pose, gt['obj_bb'])) for loading pose and ground truth bbox. But in gt.yml file I can't find 'obj_bb' items.
I also try to delete this item and just load pose, but It seems use for cropping image.
can you give me some suggestions?

thanks,
yuning