Problem with GaussianNB

[JorgeAraya99]

I was trying to use nyoka with a bunch of models (LR, RF, KNN, etc.). When I tried to use the skl_to_pmml function with GaussianNB, I get the error "AttributeError: 'GaussianNB' object has no attribute 'sigma_' ".
I looked on the scikit-learn website, and it shows that the older version of sklearn used to have sigma_ as an atribbute of GNB.