Tried to read to pickle file but a "ModuleNotFoundError: No module named 'mmdet3d'" error occurred

[BuddyZhu]

I retrained 3DSSD and tried to test the model, the tested result was saved to a pickle file, but no matter if I tried to open it with VScode extension or through python codes as the attached picture shows, same error occurred.
I am wondering why we need "mmdet3d" module to read the pickle file?
How should I solve this problem?
Thanks in advance for any help!

[JingweiZhang12]

Maybe you can try to load it with MMEngine.

[BuddyZhu]

Thanks for getting back, I tried, still not working. I am trying to install mmdet3d.

[BuddyZhu]

I installed mmengine under the environment of mmdetection3d, it worked.
Just feel weird why we need module 'mmdet3d' to open this pickle file.

[JingweiZhang12]

@BuddyZhu Hi, how did you save the results? I guess maybe you save the box structures LiDARInstance3DBoxes rather than np.ndarray so the pkl file parsing will import mmdet3d.
You can set pklfile_prefix to specify the saved path in the command script and we will save the results https://github.com/open-mmlab/mmdetection3d/blob/dev-1.x/mmdet3d/evaluation/metrics/kitti_metric.py#L438

[BuddyZhu]

I followed the following commands, and the pickle file was saved to the specified path.
python tools/test.py configs/3dssd_ray/3dssd_4x1_kitti-3d-3class.py work_dirs/3dssd_4x1_kitti-3d-3class/latest.pth --out ./work_dirs/3dssd_4x1_kitti-3d-3class/test_result/3dssd_4x1_kitti-3d-3class_80epoch.pkl --show --show-dir ./work_dirs/3dssd_4x1_kitti-3d-3class/test_result
for test.py, I didn't see pklfile_prefix in the parameter list.

[JingweiZhang12]

Both are fine. Your solution is on the master/dev branch while my solution is on the dev-1.x branch: specificly, --cfg-options test_evaluator.pklfile_path=${SAVED_PATH}