How to switch off plots when evaluating Rasa

Following the documentation for end2end tests I tried to run

python3 -m rasa_core.test default --core models/dialogue --nlu models/current/nlu --stories --e2e -o test_output

However I develop my Rasa code inside a Docker container and the script fails with

rasa_nlu/", line 100, in plot_confusion_matrix plt.clf() ... _tkinter.TclError: no display name and no $DISPLAY environment variable

The problems seems to be the creation of the plots by the evaluation/test code.

Is it possible to switch off the creation of the plots when running an end-2-end evaluation of Rasa?

We didn’t implement plot disabling yet, we have an issue for that: add a flag to disable plotting confusion matrix in test · Issue #3549 · RasaHQ/rasa · GitHub. Would you like to contribute to enable this functionality?