An error occurred while creating data：TypeError: expected dtype object, got 'numpy.dtype[float64]'

@Tai-Wang Hi, I have organized the data as required, but an error was reported when creating the data. I am currently not sure what the reason is.

open-mmlab) shl@zhihui-mint:~/shl_res/MMlab/mmdetection3d$ python tools/create_data.py kitti --root-path ./data/kitti --out-dir ./data/kitti --extra-tag kitti
Generate info. this may take several minutes.
[                                                  ] 0/3712, elapsed: 0s, ETA:Traceback (most recent call last):
  File "tools/create_data.py", line 243, in <module>
    out_dir=args.out_dir)
  File "tools/create_data.py", line 23, in kitti_data_prep
    kitti.create_kitti_info_file(root_path, info_prefix)
  File "/home/shl/shl_res/MMlab/mmdetection3d/tools/data_converter/kitti_converter.py", line 117, in create_kitti_info_file
    _calculate_num_points_in_gt(data_path, kitti_infos_train, relative_path)
  File "/home/shl/shl_res/MMlab/mmdetection3d/tools/data_converter/kitti_converter.py", line 65, in _calculate_num_points_in_gt
    points_v, rect, Trv2c, P2, image_info['image_shape'])
  File "/home/shl/shl_res/MMlab/mmdetection3d/mmdet3d/core/bbox/box_np_ops.py", line 639, in remove_outside_points
    frustum_surfaces = corner_to_surfaces_3d_jit(frustum[np.newaxis, ...])
TypeError: expected dtype object, got 'numpy.dtype[float64]'

Below are some versions of the library package I instlled.

(open-mmlab) shl@zhihui-mint:~/shl_res/MMlab/mmdetection3d$ conda list mmcv
# packages in environment at /home/shl/anaconda3/envs/open-mmlab:
#
# Name                    Version                   Build  Channel
mmcv-full                 1.3.1                    pypi_0    pypi
(open-mmlab) shl@zhihui-mint:~/shl_res/MMlab/mmdetection3d$ conda list mmdet
# packages in environment at /home/shl/anaconda3/envs/open-mmlab:
#
# Name                    Version                   Build  Channel
mmdet                     2.11.0                    dev_0    <develop>
mmdet3d                   0.12.0                    dev_0    <develop>
(open-mmlab) shl@zhihui-mint:~/shl_res/MMlab/mmdetection3d$ 

[Wuziyi616]

We may need to be cautious about that because MMDet3D may not rely on MMDet 2.12.0 in our next release. I still suggest installing numpy<1.20.0 at first to avoid such issues.

[shliang0603]

Thank you very much. I have solved this problem. I deleted the conda virtual environment that I built, and then re-created a new virtual environment, and then first installed the numpy==1.18.0 version in the virtual environment. I suggest that you can specify the numpy version in mmdetection, because the latest version is installed by default.