GitLab

* Add shape-aware grouping head

* Reformat docstrings

* Remove rewritten get_anchors in shape_aware_head

* Refactor and simplify shape-aware grouping head

* Fix docstring

* Remove fixed preset shape heads

* Add unittest for AlignedAnchor3DRangeGeneratorPerCls

* Add unittest for get bboxes in shape_aware_head

* Add unittest for loss of shape_aware_head

* Fix unstandard docstrings

* Minor fix for a comment

* Add assertion to make sure not all boxes are filtered

Update mmdet3d/models/dense_heads/anchor3d_head.py, mmdet3d/models/dense_heads/free_anchor3d_head.py, mmdet3d/models/dense_heads/parta2_rpn_head.py, mmdet3d/models/dense_heads/train_mixins.py, mmdet3d/models/dense_heads/vote_head.py, mmdet3d/models/roi_heads/bbox_heads/parta2_bbox_head.py, mmdet3d/models/roi_heads/mask_heads/pointwise_semantic_head.py, mmdet3d/models/roi_heads/roi_extractors/single_roiaware_extractor.py, mmdet3d/models/roi_heads/base_3droi_head.py, mmdet3d/models/roi_heads/part_aggregation_roi_head.py files