- Add ``sample_weight`` parameter to :func:`metrics.cohen_kappa_score` by

Victor Poughon.

is a lot faster with ``return_std=True`` by :user:`Hadrien Bertrand <hbertrand>`.

- Added ability to use sparse matrices in :func:`feature_selection.f_regression`

with ``center=True``. :issue:`8065` by :user:`Daniel LeJeune <acadiansith>`.

:class:`sklearn.covariance.EllipticEnvelope`.

:issue:`8086` by `Andreas Müller`_.

:class:`sklearn.decomposition.SparseCoder` transform and :func:`sklarn.decomposition.sparse_encode`

for one-dimensional data and one component.

This also impacts the output shape of :class:`sklearn.decomposition.DictionaryLearning`.

both ``'binary'`` but the union of ``y_true`` and ``y_pred`` was

``'multiclass'``. :issue:`8377` by `Loic Esteve`_.

ridge parameter `alpha_` and `lambda_` consistent with calculated

coefficients `coef_` and `intercept_`.

:issue:`8224` by :user:`Peter Gedeck <gedeck>`.

- Fixed a bug where :func:`sklearn.tree.export_graphviz` raised an error

when the length of features_names does not match n_features in the decision

- Fixed a bug in :class:`manifold.TSNE` affecting convergence of the

gradient descent. :issue:`8768` by :user:`David DeTomaso <deto>`.

API changes summary

method only if the underlying estimator does. By `Andreas Müller`_.

- :class:`multiclass.OneVsRestClassifier` now has a ``partial_fit`` method

- Estimators with both methods ``decision_function`` and ``predict_proba``

are now required to have a monotonic relation between them. The

the weighted impurity decrease from splitting is no longer alteast

``min_impurity_decrease``. :issue:`8449` by `Raghav RV_`

has been renamed to ``n_components`` and will be removed in version 0.21.

:issue:`8922` by :user:Attractadore