MAINT Parameters validation for sklearn.isotonic.check_increasing (scikit-learn#26256)

Co-authored-by: jeremie du boisberranger <jeremiedbb@yahoo.fr>

Author: jiawei-zhang-a

sklearn/isotonic.py

@@ -20,6 +20,13 @@
 __all__ = ["check_increasing", "isotonic_regression", "IsotonicRegression"]
 
 
+@validate_params(
+    {
+        "x": ["array-like"],
+        "y": ["array-like"],
+    },
+    prefer_skip_nested_validation=True,
+)
 def check_increasing(x, y):
     """Determine whether y is monotonically correlated with x.
 

sklearn/tests/test_public_functions.py

@@ -197,6 +197,7 @@ def _check_function_param_validation(
     "sklearn.feature_selection.r_regression",
     "sklearn.inspection.partial_dependence",
     "sklearn.inspection.permutation_importance",
+    "sklearn.isotonic.check_increasing",
     "sklearn.isotonic.isotonic_regression",
     "sklearn.linear_model.orthogonal_mp",
     "sklearn.linear_model.orthogonal_mp_gram",