Segmentation fault (core dumped) when running `check.py` about pytorch-correlation-extension

[ClementPinard]

It is very surprising that your array is full of zeros.

In the mean time, since the system tries compute the relative difference between 0 and 0, you are bound to have weird numbers, even if the absolute eror is practically 0.

Did you change the check.py file especially at line 75 and 79 ?

[ysnan]

Hi, I did not change anything of that file. I installed the package and did the checking right away. I just guess that the problem comes from the incompatibility with the new version of pytorch.

[ClementPinard]

how did you get the check.py file ? Did you clone the github repo ? Is it up to date ?

I just tried with pytorch 1.4 with a fresh install and it worked

[ysnan]

I also tried to use pytorch 1.4 with a fresh install, use git install spatial-correlation-sampler to install the package and use git clone https://github.com/ClementPinard/Pytorch-Correlation-extension to get the check.py. It turns out to be another problem:

$ python check.py forward
Traceback (most recent call last):
File "check.py", line 8, in
from spatial_correlation_sampler import SpatialCorrelationSampler
File "/home/ysnan/anaconda3/envs/torch_latest/lib/python3.6/site-packages/spatial_correlation_sampler/init.py", line 1, in
from .spatial_correlation_sampler import SpatialCorrelationSampler, spatial_correlation_sample
File "/home/ysnan/anaconda3/envs/torch_latest/lib/python3.6/site-packages/spatial_correlation_sampler/spatial_correlation_sampler.py", line 6, in
import spatial_correlation_sampler_backend as correlation
ImportError: /home/ysnan/anaconda3/envs/torch_latest/lib/python3.6/site-packages/spatial_correlation_sampler_backend.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _ZN6caffe26detail37_typeMetaDataInstance_preallocated_32E

I guess the problem came from the incompatibility with gcc version?

[ClementPinard]

I have the same gcc version as you. 🤔
I guess here the problem is deeper that just this module.

Can you try to compile the official tutorial and see if it works ?
https://github.com/pytorch/extension-cpp

[ysnan]

The problem has been solved! Following the guideline you referred, I used python setup.py install to install the package, it passed with no error. But the weird thing is why the pip approach did not work.

Anyway, thank you for your help!