An educational implementation of GraphSLAM - http://robots.stanford.edu/papers/thrun.graphslam.pdf
Why do you think that https://github.com/kemfic/VOpy is a good alternative to graph_slam
An educational implementation of GraphSLAM - http://robots.stanford.edu/papers/thrun.graphslam.pdf
Why do you think that https://github.com/kemfic/VOpy is a good alternative to graph_slam