What's the meaning of r in rEdge?

[chenxinl]

Hi!
I can't get the meaning of r in rEdge where 'rEdge: (u,v,r), room indices and relative position(u relative to v)'.
Meanwhile, it is not used in the floorplan.py, see 101: 'for u, v, _ in self.data.rEdge:', but I want to know the relation in rooms, so can you explain the definition of r in rEdge?
Thanks a lot.

[zzilch]

For the edge relation, please refer to Fig.3 (c) in the paper.
We compute the edge relation on-the-fly because we augment the data by random rotation and flip when training.