ImportError: DLL load failed while importing ball_query_ext:

[deathdeam]

So I am trying to use BEVFormer's create_data.py to generate dataset in Windows. The error I got is:
File "tools/create_data.py", line 6, in <module> from tools.data_converter import kitti_converter as kitti File "d:\cvpr_3d_opancy\mmdetection3d\tools\data_converter\kitti_converter.py", line 8, in <module> from mmdet3d.core.bbox import box_np_ops File "d:\cvpr_3d_opancy\mmdetection3d\mmdet3d\core\__init__.py", line 3, in <module> from .bbox import * # noqa: F401, F403 File "d:\cvpr_3d_opancy\mmdetection3d\mmdet3d\core\bbox\__init__.py", line 5, in <module> from .iou_calculators import (AxisAlignedBboxOverlaps3D, BboxOverlaps3D, File "d:\cvpr_3d_opancy\mmdetection3d\mmdet3d\core\bbox\iou_calculators\__init__.py", line 2, in <module> from .iou3d_calculator import (AxisAlignedBboxOverlaps3D, BboxOverlaps3D, File "d:\cvpr_3d_opancy\mmdetection3d\mmdet3d\core\bbox\iou_calculators\iou3d_calculator.py", line 6, in <module> from ..structures import get_box_type File "d:\cvpr_3d_opancy\mmdetection3d\mmdet3d\core\bbox\structures\__init__.py", line 2, in <module> from .base_box3d import BaseInstance3DBoxes File "d:\cvpr_3d_opancy\mmdetection3d\mmdet3d\core\bbox\structures\base_box3d.py", line 6, in <module> from mmdet3d.ops.iou3d import iou3d_cuda File "d:\cvpr_3d_opancy\mmdetection3d\mmdet3d\ops\__init__.py", line 6, in <module> from .ball_query import ball_query File "d:\cvpr_3d_opancy\mmdetection3d\mmdet3d\ops\ball_query\__init__.py", line 1, in <module> from .ball_query import ball_query File "d:\cvpr_3d_opancy\mmdetection3d\mmdet3d\ops\ball_query\ball_query.py", line 4, in <module> from . import ball_query_ext ImportError: DLL load failed while importing ball_query_ext: 找不到指定的模块。

And my environment is shown below:

mmcv-full 1.4.0 pypi_0 pypi
mmdet 2.14.0 pypi_0 pypi
mmdet3d 0.17.1 dev_0
mmsegmentation 0.14.1 pypi_0 pypi

As the environment shows, my mmdet3d is succesfully installed and I actually had tried uninstall and install mmdet3d multiple times to solve the issue, however, it did not work.

Any help would be appreciated!

[Twizer1]

The issue may originate from the environment, as explained here:
https://docs.conda.io/projects/conda/en/latest/user-guide/troubleshooting.html#numpy-mkl-library-load-failed

In my case, simply using this line of code resolved the problem: set CONDA_DLL_SEARCH_MODIFICATION_ENABLE=1.

[dynamic721]

Hello，how do you solve this problem in the end? I have tried the mentioned method, but it still doesn't work.