GitLab

* import some ops from mmcv instead of mmdet3d

* use mmcv ops in primitive_head.py

* use mmcv ops in PAConv

* remove ops in mmdet3d & fix some bugs

* remove spconv & fix some bugs

* fix voxelization unittest

* remove spconv in ops/__init__.py

* refine ops/__init__.py

* recover sparse_block in ops/__init__

* fix parta2_bbox_head unittest

* remove remaining ops

* recover ops/__init__.py for bc breaking

* add source of ops from mmcv

* recover the unittest for voxelization

* remove unittest