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33473.Fix

doc/whats_new/upcoming_changes/sklearn.model_selection/33473.fix.rst

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  • Fixed incorrect :class:ValueError when using scoring="average_precision" or similar in model selection utilities such as model_selection.GridSearchCV or model_selection.cross_validate with multiclass classifiers. The pos_label parameter is only relevant for binary classification and was incorrectly being validated for scorers used on multiclass problems. By :user:Olivier Grisel <ogrisel>.