You are reading documentation for the unreleased version of Matplotlib. Try searching for the released version of this page instead?
Version 3.0.0rc1.post676+g4e9b6994e
matplotlib
Fork me on GitHub

matplotlib.axes.Axes.relim

Axes.relim(visible_only=False)

Recompute the data limits based on current artists. If you want to exclude invisible artists from the calculation, set visible_only=True

At present, Collection instances are not supported.