I might be totally confusing this, but I faintly remember to have read some super cool, tutorial-like documentation about crgeo and all the interfaces and method it provides. I think it was a PDF that explained how different feature extractors, pre- and post-processors, etc. could be stacked together in a modular way to use CommonRoad graphs with GNNs for learning tasks. I might have dreamed this or it was related to a totally different project. But if not, could someone point me to that document?