Further Errors in GraspClutter6D

[LucaBonfiglioli]

I run a sha256 dedup pass on the dataset and noticed 52 conflicts.

It appears scene 401 and 404 are duplicated. Same hash, same content, exactly the same.

I also noticed that frame 7 in scene 401 and 404 has some objects in it, but the masks are completely empty.

[SeungBack]

Thanks for this analysis, and I believe there was some mistake in dataset management on my end. I will see if a future patch is possible.