torch/lib/libtorch_python.so: undefined symbol: PySlice_Unpack

Traceback (most recent call last):
  File "train.py", line 3, in
    import torch
  File "/home/aita/anaconda3/envs/proGCN2/lib/python3.6/site-packages/torch/__init__.py", line 190, in
    from torch._C import *
ImportError: /home/aita/anaconda3/envs/proGCN2/lib/python3.6/site-packages/torch/lib/libtorch_python.so: undefined symbol: PySlice_Unpack

Due to the keyboard issue, I would have to use English to explain the above bug.

The full bug is shown above in red color.

Reason:

Your current python version is too low.

Mine:                   Python 3.6.0,        Pytorch 1.7.0,            CUDA 11.0

Solution:

conda install python==3.6.2

Dont worry about the currently stored python version, the above command will overwirte the previsous python version. That command works perfectly well.