import and compile error

[Liaoqing-up]

- error:

hello, when i run demo, i get the error: ImportError: cannot import name 'ball_query_ext' from 'mmdet3d.ops.ball_query' (/opt/sdatmp/lq/project/gitproject/mmdetection3d/mmdet3d/ops/ball_query/init.py).
It seems come from these error when i run pip install -v -e . to install MMDetection3D:
warning: no files found matching 'mmdet3d/ops//.cpp'
warning: no files found matching 'mmdet3d/ops//.cu'
warning: no files found matching 'mmdet3d/ops//.h'
warning: no files found matching 'mmdet3d/ops//.cc'
FAILED: /opt/sdatmp/lq/project/gitproject/mmdetection3d/build/temp.linux-x86_64-3.7/mmdet3d/ops/spconv/src/indice_cuda.o
error: cannot call member function ‘void std::basic_string<_CharT, _Traits, _Alloc>::_Rep::_M_set_sharable()
Traceback (most recent call last):
File "setup.py", line 253, in zip_safe=False)
File "/opt/sdatmp/lq/anaconda/envs/open_mmlab/lib/python3.7/site-packages/torch/utils/cpp_extension.py", line 1140, in _write_ninja_file_and_compile_objects
error_prefix='Error compiling objects for extension')
File "/opt/sdatmp/lq/anaconda/envs/open_mmlab/lib/python3.7/site-packages/torch/utils/cpp_extension.py", line 1413, in _run_ninja_build
raise RuntimeError(message)
RuntimeError: Error compiling objects for extension

- My environment:

ubuntu 18.04
cuda 10.1
pytorch 1.5.0
mmcv-full 1.3.1
mmdet 2.11.0
mmdet3d 0.12.0
numpy 1.20.2
pycocotools 2.0.2
cuDNN 7.6.03
gcc 7.5.0
besides, i have tested torch.cuda.is_available() and got True

I ran mmdet3d.utils.collect_env.py, and got the following print message:

Have you encounter these errors before? I need your help, thankyou

[Tai-Wang]

Please refer to #420 . If there is any further question, please follow the template for reimplementation issue to redescribe your problem.

[Tai-Wang]

Can you successfully import mmcv and mmdet? Please strictly follow the way given in the documentation to install these two packages. For your compilation error, it maybe related to your gcc or cuda version. Please search for some information about the error message like this