UPDATE May 23 202

Here's a list of the remaining classes:

• feature_selection.SelectorMixin
• calibration.CalibratedClassifierCV (#15134)
• decomposition.DictionaryLearning (#16907)
• decomposition.MiniBatchDictionaryLearning (#16907)
• decomposition.SparseCoder (#15233)
• ensemble.GradientBoostingClassifier
• gaussian_process.kernels.CompoundKernel
• gaussian_process.kernels.Hyperparameter
• gaussian_process.kernels.Kernel
• gaussian_process.kernels.PairwiseKernel
• inspection.PartialDependenceDisplay
• linear_model.PoissonRegressor
• linear_model.TweedieRegressor
• linear_model.GammaRegressor
• metrics.ConfusionMatrixDisplay
• metrics.PrecisionRecallDisplay
• mixture.BayesianGaussianMixture
• mixture.GaussianMixture
• multioutput.ClassifierChain (#15211)
• multioutput.RegressorChain (#15215)
• neighbors.BallTree
• neighbors.DistanceMetric
• neighbors.KDTree

Most of the docs in classes lack examples. It would be great to add one or two examples similar to this, http://scikit-learn.org/stable/modules/generated/sklearn.linear_model.Lasso.html