* MAINT Update CI dependencies

* Trigger [pypy] [scipy-dev] [nogil] [icc-build]

Co-authored-by: "Samuel O. Ronsin" <[email protected]>
Co-authored-by: Olivier Grisel <[email protected]>
Co-authored-by: Christian Lorentzen <[email protected]>

…oc validation (#24452)

Co-authored-by: Christian Lorentzen <[email protected]>
Co-authored-by: Jérémie du Boisberranger <[email protected]>

…24146)

* Add stacking multilabel functionality

* Add underscore to a class attr

* Remove model from base estimator in test_stacking

* Remove scale in train/test split in test_stacking_classifier_multilabel

* Add stack_method as a test parameter, change RandomForestClassifier to KNeighborsClassifier in test

* Update Changelog

* fix doc typos

* predict_proba output will be concatenate this list in an array of shape n_samples, n_outputs * n_classes - 1. Update test.

* Update sklearn/ensemble/_stacking.py

Co-authored-by: Guillaume Lemaitre <[email protected]>

* Update doc/whats_new/v1.0.rst

Co-authored-by: Guillaume Lemaitre <[email protected]>

* update whats_new

* add passthrough test

* update whats_new with current PR

* Apply suggestions from code review

Co-authored-by: Julien Jerphanion <[email protected]>

* update tests

* Apply suggestion to update comments on `concatenate`

Co-authored-by: Julien Jerphanion <[email protected]>

* parametrized the two tests into one

* parametrized the two tests into one

* strip the mysterious trailing  _r

* fix multilabel list scenario

* add Guillaume's recommendations

* add test for

* some fix

* split tests

* fix flake8

* add suggestions

* Trigger CI

* remove multiclass-multioutput from comments and docstrings

Co-authored-by: Nicolas <[email protected]>
Co-authored-by: Nestor Navarro <[email protected]>
Co-authored-by: Nestor Navarro <[email protected]>
Co-authored-by: Guillaume Lemaitre <[email protected]>
Co-authored-by: Julien Jerphanion <[email protected]>

Co-authored-by: Olivier Grisel <[email protected]>
Co-authored-by: jeremie du boisberranger <[email protected]>

…#24447)

Co-authored-by: Jérémie du Boisberranger <[email protected]>

Co-authored-by: iofall <[email protected]>
Co-authored-by: arisayosh <[email protected]>

Co-authored-by: Olivier Grisel <[email protected]>
Co-authored-by: Julien Jerphanion <[email protected]>
Co-authored-by: Guillaume Lemaitre <[email protected]>

Co-authored-by: Olivier Grisel <[email protected]>
Co-authored-by: Julien Jerphanion <[email protected]>

…dly (#24335)

Co-authored-by: Guillaume Lemaitre <[email protected]>

…fy input (#24405)

Co-authored-by: Guillaume Lemaitre <[email protected]>

Co-authored-by: Loïc Estève <[email protected]>

Co-authored-by: Olivier Grisel <[email protected]>
Co-authored-by: Thomas J. Fan <[email protected]>
Co-authored-by: Guillaume Lemaitre <[email protected]>

#24403)