undefined symbol

[weijielyu]

Thanks for the nice work!

I got this error when I ran python demo.py -d co3d_toy -c hydrant:

Traceback (most recent call last):
  File "demo.py", line 6, in <module>
    from pytorch3d.renderer import PerspectiveCameras
  File "/home/xxx/miniconda3/envs/sparsefusion/lib/python3.8/site-packages/pytorch3d/renderer/__init__.py", line 3, in <module>
    from .blending import (
  File "/home/xxx/miniconda3/envs/sparsefusion/lib/python3.8/site-packages/pytorch3d/renderer/blending.py", line 9, in <module>
    from pytorch3d import _C
ImportError: /home/xxx/miniconda3/envs/sparsefusion/lib/python3.8/site-packages/pytorch3d/_C.cpython-38-x86_64-linux-gnu.so: undefined symbol: _ZTIN3c1021AutogradMetaInterfaceE

Does anyone know what's the fix for this?
Thank you!