The api for matplotlib.patches.Ellipse().__init__() appears to change. Currently using a version 3.8 gtsam/utils/plot.py Line 156 with a kwarg for angle instead of existing positional arguments. It ...

If you already have a plot generated with Matplotlib, activating xkcd-mode is as simple as calling a method on the pyplot object: matplotlib.pyplot.xkcd() ...

About Python scripts using the matplotlib library to create high-quality scientific plots similar to those produced in Origin.