Inconsistent class_maps for s3dis

[fclairec]

Inconsistent class_maps for s3dis

[loicland]

This is because 0 is used as the nolabel class during training (stairs are not evaluated). Since the nolabel class is never predicted, we shift the labels by one when evaluating.

To see this, remember that the columns of target for a superpoint are as follows, (see here):

• col0: label mode, ie the most common label the superpoint
• col1: number of unannotated points
• col2+: number of point of each label

When training, we use the cross entropy with the label mode (target[0]), see here. When evaluating, we compute the precision of the point-level predictions (target[2:]), see here.

[fclairec]

Thanks @loicland for the explanation. I found my thinking mistake..