_C.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _ZN2at19UndefinedTensorImpl10_singletonE

ERROR:

_C.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _ZN2at19UndefinedTensorImpl10_singletonE

或者是：

cpython-37m-x86_64-linux-gnu.so: undefined symbol: THPVariableClass

解决：

https://github.com/Tramac/awesome-semantic-segmentation-pytorch/issues/24

https://github.com/Tramac/awesome-semantic-segmentation-pytorch/issues/76

solved.

rm -r build, then recompile.

main reason is: I compiled with pytorch1.0.1, then recompile with pytorch1.1 without delete build folder.

refer to: facebookresearch/maskrcnn-benchmark#421, which is using similiar setup.py.

------------------

在python setup.py install 操作的文件夹下，rm -r build，然后再重新安装就好了。

cd inplace_abn

python setup.py install

cd scripts

pip install -r requirements.txt

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