addition of the attribute classes_ in the doc was actually implemented in all classes addressed by this PR, in a variety of other PRs

class QuadraticDiscriminantAnalysis #14374
class GradientBoostingClassifier #14459
class LogisticRegression #12795
class LogisticRegressionCV #12795
class PassiveAggressiveClassifier #14459
class Perceptron #14459
class RidgeClassifier #14459
class RidgeClassifierCV #14459
class SGDClassifier #14459
class GaussianNB #14354
class MultinomialNB #15998
class ComplementNB #14354
class BernoulliNB #14354
class KNeighborsClassifier #14374
class RadiusNeighborsClassifier #14374
class NearestCentroid #14459
class LabelPropagation #16042
class LabelSpreading #16042
class LinearSVC #14459 #16060
class SVC #14459 #16060
class NuSVC #14459 #16060
class ExtraTreeClassifier #14339

probably should be closed, and related issue #11444 as well.

Only the test could be relevant.

Only the test could be relevant.

Agreed it would be good to add this test in a separate PR and fix the few remaining cases. Running this test on master, I found that there were still issues (probably because these classes were added since this PR was made):

• sklearn.utils._mocking.CheckingClassifier (probably can be skipped because it is used just for tests)
• sklearn.ensemble.HistGradientBoostingClassifier
• sklearn.multioutput.MultiOutputClassifier
• sklearn.ensemble.StackingClassifier

I am going to close this PR, thanks for drawing our attention to it @judithabk6.

@judithabk6 I opened #16273. If you are still at the sprint, that would be a good one to tackle.