How to evaluate a soft Voting classifier being trained on some data

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I have taken 3 classification models,

clf1 = DecisionTreeClassifier(max_depth=4)
clf2 = KNeighborsClassifier(n_neighbors=7)
clf3 = SVC(kernel='rbf', probability=True)

I am passing them to voting classifier as parameters and choose soft voting.

eclf = VotingClassifier(estimators=[('dt', clf1), ('knn', clf2), ('svc', clf3)], voting='soft', weights=[2,1,2])

clf1 =,y_train)
clf2 =,y_train)
clf3 =,y_train)
eclf =,y_train)

Here i am getting error ,AttributeError: 'VotingClassifier' object has no attribute 'best_score_'

print("Train accuracy",eclf.score(titanic_train1, y_train))

I want to find best tuning parameters for this model?

Sep 6, 2018 in Python by bug_seeker
• 15,300 points

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VotingClassifier does not have a best_score_ attribute. You can look at the scikit-learn documentation here to see that the best_score_ attribute is missing.

If you're trying to get a cross validation score you need to use something like K-Fold or GridSearchCV where K-Fold will give you an idea for how well the classifier generalizes to naive data and GridSearchCV will help determine the best parameter configuration for the model.

answered Sep 6, 2018 by Priyaj
• 56,140 points

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