GitLab

* Adjust the directory structure of tests

* Adopted the new directory via _get_config_directory

* Adopted the new directory via _get_config_directory

* Adopted the new directory via _get_config_directory

* modified the wrong code comments

* Add centerpoint_rpn and scn, change pillar encoder and voxel_encoder

* Move test_voxel_encoders.

* Change names, add docstring.

* Reconstruct centerpoint_rpn.

* Add centerpoint_rpn.

* Change SECONDFPN, delete centerpoint_fpn

* Remove SparseBasicBlock.

* Change SpMiddleResNetFHD to SparseEncoder.

* Finish SparseEncoder unittest.

* Change test_hard_simple_VFE.

* Change option, add legacy.

* Change docstring, change legacy.

* Fix legacy bug.

* Change unittest, change docstring.

* Change docstring.