[bug] AssertionError: use_ground_plane is True but find plane is None

[Raiden-cn]

Describe the bug
in raw version about kitti model, after run 'python tools/train.py configs/pv_rcnn/pv_rcnn_8xb2-80e_kitti-3d-3class.py --work-dir works_dir/debug', show the following:
AssertionError: use_ground_plane is True but find plane is None.
But I already prepare planes files in training floder.

[Xiangxu-0103]

Whether your annotation files have 'plane' information? You can use the annotation file we provided to have a try.

More details can be found here: https://github.com/open-mmlab/mmdetection3d/blob/dev-1.x/docs/en/user_guides/dataset_prepare.md#summary-of-annotation-files

[Raiden-cn]

I forget add '--with-plane' in when 'python tools/create_data.py'. The docs of you mentioned should be updated. 'python tools/create_data.py kitti --root-path ./data/kitti --out-dir ./data/kitti --extra-tag kitti --only-gt-databse' will occure error: unrecognized arguments: --only-gt-databse

[Xiangxu-0103]

Can you create a PR to help us update the docs?

[Raiden-cn]

Sure! I`ll do it soon.

[HXB-1997]

how to download this kitti plane?

[Xiangxu-0103]

@HXB-1997 You can download the road planes here.

[HXB-1997]

@HXB-1997 You can download the road planes here.

thanks