ImportError: /workspaces/BRNet/mmdet3d/ops/ball_query/ball_query_ext.cpython-37m-x86_64-linux-gnu.so: undefined symbol: _ZN6caffe28TypeMeta21_typeMetaDataInstanceIN3c107complexINS2_4HalfEEEEEPKNS_6detail12TypeMetaDataEv

[fathyshalaby]

Thanks for your error report and we appreciate it a lot.

Checklist

1. I have searched related issues but cannot get the expected help.
2. The bug has not been fixed in the latest version.

Describe the bug
I tried running the demo mentioned in the readme.md and get the following error:

Traceback (most recent call last):
File "demo/pcd_demo.py", line 3, in
from mmdet3d.apis import inference_detector, init_detector, show_result_meshlab
File "/workspaces/BRNet/mmdet3d/apis/init.py", line 1, in
from .inference import inference_detector, init_detector, show_result_meshlab
File "/workspaces/BRNet/mmdet3d/apis/inference.py", line 8, in
from mmdet3d.core import Box3DMode, show_result
File "/workspaces/BRNet/mmdet3d/core/init.py", line 2, in
from .bbox import * # noqa: F401, F403
File "/workspaces/BRNet/mmdet3d/core/bbox/init.py", line 2, in
from .coders import DeltaXYZWLHRBBoxCoder
File "/workspaces/BRNet/mmdet3d/core/bbox/coders/init.py", line 6, in
from .class_agnostic_bbox_coder import ClassAgnosticBBoxCoder
File "/workspaces/BRNet/mmdet3d/core/bbox/coders/class_agnostic_bbox_coder.py", line 4, in
from mmdet3d.core.bbox.structures import rotation_3d_in_axis
File "/workspaces/BRNet/mmdet3d/core/bbox/structures/init.py", line 1, in
from .base_box3d import BaseInstance3DBoxes
File "/workspaces/BRNet/mmdet3d/core/bbox/structures/base_box3d.py", line 5, in
from mmdet3d.ops.iou3d import iou3d_cuda
File "/workspaces/BRNet/mmdet3d/ops/init.py", line 5, in
from .ball_query import ball_query
File "/workspaces/BRNet/mmdet3d/ops/ball_query/init.py", line 1, in
from .ball_query import ball_query
File "/workspaces/BRNet/mmdet3d/ops/ball_query/ball_query.py", line 4, in
from . import ball_query_ext
ImportError: /workspaces/BRNet/mmdet3d/ops/ball_query/ball_query_ext.cpython-37m-x86_64-linux-gnu.so: undefined symbol: _ZN6caffe28TypeMeta21_typeMetaDataInstanceIN3c107complexINS2_4HalfEEEEEPKNS_6detail12TypeMetaDataEv

Reproduction

1. What command or script did you run?

CUDA_VISIBLE_DEVICES=0 python demo/pcd_demo.py sunrgbd_000094.bin demo/brnet_8x1_sunrgbd-3d-10class.py checkpoints/brnet_8x1_sunrgbd-3d-10class_trained.pth

I used the config file included so don't think that is a solution to this problem.

[cheng052]

It's usually a compile error. You may check your pytorch version, nvcc version, gcc/g++ version for compiling the cuda ops in mmdetection3d.