* CLN use pytest raises ctxt manager for class weights & estimators [skip ci]
* CLN use pytest raises ctxt manager for multiclass test
* CLN use pytest warns in estimator checks test
* CLN use pytest raises ctxt manager for random test
* CLN use pytest raises ctxt manager for sparsefuncs test
* CLN use pytest raises ctxt manager for testing utils tests
* CLN use pytest raises ctxt manager for utils tests
* CLN use pytest raises ctxt manager for validation tests
* revert test_estimator_check.py to upstream master
* unit test for _ovr_decision_function
* sigmoid scale
* error on subset test
* clearer comment on test
* new scaling function forget sigmoid
* remove exception in subset check for SVC decision_function
* add comment and update whats_new
* update comment
* change test for float imprecision
* use 1/3 instead of 1/2
* merge conflict error
* flake8 correction and assert_true replacement
* better comment
* refer to public functions
* remove reference to private function
* rst dots
* change fix comments
* Raise error when SparseSeries is passed into roc_curve
* Changed "y_true" in second if block to "y_score"
* Remove code to import pandas and add sparseseries check to 'type_of_target' function. Finally, add 'type_of_target' call to _binary_clf_curve
* Remove pandas import and old comparison in roc_curve.
* Add test for 'type_of_target' function
* Add white space after commas
* Correct other white space issues
* Move type_of_target test into try clause, remove test_precision_recall_curve_pos_label since as multiclass it doesn't make sense
* Add test_precision_recall_curve_pos_label back in and also add test_binary_clf_curve to test new logic in _binary_clf_curve function
* Correct syntax and formatting.
* Remove trailing white space
* Correct validation logic
* Update test_multiclass.py per @jnothman 's request.
* Import SkipTest function.
* Remove extra white space from line 303
MAINT Remove sequence of sequence support from datasets
MAINT Remove return_indicator param
MAINT Remove multilabel-seq test in OVR
MAINT Remove multilable-seq test in check_cv
MAINT Remove multilabel seq test in label_binarizer
TST type_of_target returns "unknown" for multilabel-sequence types
TST _check_targets should raise a ValueError
DOC show multilabel indicator as an example; remove return_indicator param
DOC use consistent lower case y for target
Jérémie du Boisberranger