How are seg_structure_l1 and seg_structure_l2 obtained?

[Huijie-Liu]

Thanks for the excellent work and open-sourcing this project!

I’m trying to understand how the seg_structure_l1 and seg_structure_l2 variables are generated in these lines of occ_head.py:

OctreeOcc/projects/mmdet3d_plugin/bevformer/dense_heads/occ_head.py

Lines 231 to 232 in 54afdd6

	octree_structure_l1 = seg_structure_l1[0]
	octree_structure_l2 = seg_structure_l2[0]

I searched the repo but couldn’t find how these variables are derived. I know they come from data preprocessing and likely correspond to the “3.4 Semantic-Guided Octree Initialization” step mentioned in the paper, but I’m unclear on the exact process.

Could you please point me to the code or data‐preprocessing pipeline where seg_structure_l1 and seg_structure_l2 are created? Thank you!