Is it possible to optimize pose graph with some error loop edges?

I checked the doc [graphslam.graph module — graphslam 0.0.17 documentation](https://python-graphslam.readthedocs.io/en/stable/graphslam.graph.html) and I don't quite understand...
In my use case, I have loop edges that some are correct and some are outliners. So I wonder if the package has outlier removal functionality or has some kind robust kernel? 
