Expected 88 from C header, got 80 from PyObject

[ktro2828]

I run tools/train.py, then I got this error,

Traceback (most recent call last):
  File "tools/train.py", line 16, in <module>
    from mmdet3d.datasets import build_dataset
  File "/home/leus/autoware/mmdetection3d/mmdet3d/datasets/__init__.py", line 1, in <module>
    from mmdet.datasets.builder import build_dataloader
  File "/home/leus/.local/share/virtualenvs/mmdetection3d-rnRHe6mf/lib/python3.8/site-packages/mmdet/datasets/__init__.py", line 2, in <module>
    from .cityscapes import CityscapesDataset
  File "/home/leus/.local/share/virtualenvs/mmdetection3d-rnRHe6mf/lib/python3.8/site-packages/mmdet/datasets/cityscapes.py", line 12, in <module>
    import pycocotools.mask as maskUtils
  File "/home/leus/.local/share/virtualenvs/mmdetection3d-rnRHe6mf/lib/python3.8/site-packages/pycocotools/mask.py", line 3, in <module>
    import pycocotools._mask as _mask
  File "pycocotools/_mask.pyx", line 1, in init pycocotools._mask
ValueError: numpy.ndarray size changed, may indicate binary incompatibility. Expected 88 from C header, got 80 from PyObject

from this issue #301, I tried

pip uninstall pycocotools
pip uninstall mmpycocotools
pip install mmpycocotools

but it doesn't work...

My environment

• cuda=10.2
• Python==3.8
• torch==1.7.0
• mmcv-full==1.3.0
• mmdet==2.11.0
• mmdet3d==0.12.0
• mmpycocotools==12.0.3

can anyone help me??

[ktro2828]

I found that I got error with Python==3.8.8 although got no error with Python==3.6.9

[ZhangYu1ing]

Did you get this error when you run tools/create_data.py?

[ktro2828]

Yes, I got this error with python3.8.8, when I run tools/create_data.py

[pigtigger]

i got this erro with python3.7 ,did you figure it out?