AttributeError: module 'g2o' has no attribute 'Flag'

[luigifreda]

AttributeError: module 'g2o' has no attribute 'Flag'

[diametrical]

Got the same issue, as I installed the g2opy by myself with the wrong branch.

Issued solved by running rsync and make a python3 setup.py install

G2OPY_REVISION=5587024
git checkout $G2OPY_REVISION
rsync ./g2opy_changes/types_six_dof_expmap.h ./g2opy/python/types/sba/types_six_dof_expmap.h
rsync ./g2opy_changes/sparse_optimizer.h ./g2opy/python/core/sparse_optimizer.h   
rsync ./g2opy_changes/python_CMakeLists.txt ./g2opy/python/CMakeLists.txt   
cd build
cmake .. $EXTERNAL_OPTION
make -j8
cd ..
python3 setup.py install

[luigifreda]

Hi,
some questions:

• which is your OS?
• which install script did you use?

That message means pyslam is not using the custom g2o that needs to be compiled via the install scripts.

[JeffreyYH]

Thanks for your reply Luigi,
I am using Ubuntu 18.04 and I used install_thirdparty.sh to install g2o.

[luigifreda]

I cleaned with
$ ./clean.sh
and launched again a new install with
$ ./install_all.sh
and everything runs correctly.

Can you please check that you have a file like thirdparty/g2opy/lib/g2o.cpython-36m-x86_64-linux-gnu.so?
If not then we have a problem with the compilation of g2o.

Do you have another installation of g2o for python?
If yes, could you please try to modify its base folder path temporarily and launch main_slam.py again just to check if there is an interference with the lib paths?

I've fixed some small script errors. They should not be critical for your problem.
In any case, you may want to pull and try again.

[JeffreyYH]

Thanks for the kind explanation, Luigi.

I pulled the new changes and remove my previous g2opy and g2o(cpp) installation and reinstalled third_party by running ./install_thirdparty.sh and ./install_cpp.sh. But the problem remains.

The reason that I did not use the script install_all.sh directly is that I need different versions of some python dependencies (e,g. pytorch). But I don't think that is a issue, right?

[luigifreda]

Do you have rsync installed?
Did you run the script install_basic.sh?

Please, make sure that the actual commands are executed

[JeffreyYH]

Yes, I run install_all.sh and the problem remains.

[luigifreda]

Could you please answer the following questions?

1. Do you have another installation of g2o for python?
   If yes, could you please try to modify its base folder path temporarily and launch main_slam.py again just to check if there is an interference with the lib paths?

2. Could you please make sure that the following commands are executed and tell me what is happening there when you try to manually run them?
   https://user-images.githubusercontent.com/10080262/112065377-d61ac080-8b64-11eb-920b-b1b9ab3c65e4.png