No plot comes out

[HRI328]

In order to learn Catboost, I am following the tutorial https://github.com/catboost/tutorials/blob/master/python_tutorial.ipynb.
The following code is from Catboost tutorial. When I run this part code in Databricks, the plot doesn't work. No any graph show.
model.fit(
X_train, y_train,
cat_features=categorical_features_indices,
eval_set=(X_validation, y_validation),
logging_level='Verbose', # you can uncomment this for text output
plot=True
)

Anybody shows me why it is?