AttributeError: 'NGBClassifier' object has no attribute 'classes_'

[SamHosico]

when I use ngboost and sklearn, ngboost return a error:
AttributeError: 'NGBClassifier' object has no attribute 'classes_'
I have checked the lightGBM, it has the 'classes_', so I dont know how can I solve this problem, I need some help.
my code is as follows:

model = NGBClassifier(n_estimators=int(params['n_estimators'])
, learning_rate=params['learning_rate']
, minibatch_frac=params['minibatch_frac']
, col_sample=params['col_sample']
, Dist=Bernoulli
, verbose=False
, random_state=42)
cv = StratifiedKFold(n_splits=10, shuffle=True, random_state=42)
score = -cross_val_score(model, X_train, y_train.ravel(), cv=cv, scoring='roc_auc_ovo_weighted', error_score='raise').mean()### ###

[ryan-wolbeck]

Can you include what version you are using and provide a full example code with imports and loading a sample data like the Boston data?

[SamHosico]

Can you include what version you are using and provide a full example code with imports and loading a sample data like the Boston data?
Thanks for your reply! I have rewritten a function to replace cross validation in sklearn using the 'roc_auc' to train my model, I have achieved the expected results.