Function of pandas.scatter_matrix stopped to work well in Jupyter Notebook.
All the time it drew this plot:
And now it shows this way:
And I can't figure out, what affected this.
What can be the reason?
UPDATE
Looks like usage of seaborn heatmap in previous cells damages the function.
How to recover from seaborn.heatmap?
UPDATE 2
matplotlib.style.use('classic')
didn't recover completely
UPDATE 3
The following command
plt.rcParams.update(plt.rcParamsDefault)
also recovers only partially.