RRosio
commented
2 months ago @yutang-1sec thank you for reporting this issue! Could you share which version of Notebook you are using?
A related issue from a few years ago is also open, https://github.com/jupyter/notebook/issues/473, and as a workaround, a few users reported calling the line to set the backend multiple times sometimes allowed for it to take effect. Similar issue also reported: https://stackoverflow.com/questions/41125690/matplotlib-notebook-showing-a-blank-histogram
YuccaTang
I was switching backends when using Jupyter notebook to save or display figures.
I first used matplotlib.use('inline') to display the figures, then I used matplotlib.use('agg') to save figures. It was ok even when I returned to recall matplotlib.use('inline') to show figures.
The problem is that when I first called matplotlib.use('agg') to save figures and then used matplotlib.use('inline'), the figures didn't show up. What I got was only something like <Figure size 640x480 with 1 Axes>.
By the way, if I used %matplotlib agg and %matplotlib inline instead of matplotlib.use('agg') and matplotlib.use('inline'), the switching of backends didn't cause any problems.
I attached a screenshot of demo codes for reproducing the problem.