scikit-learn
diff --git a/‎sklearn/metrics/_regression.py
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+7Lines changed: 7 additions & 0 deletions b/‎sklearn/metrics/_regression.py
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+7Lines changed: 7 additions & 0 deletions
diff --git a/‎sklearn/tests/test_public_functions.py
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+1Lines changed: 1 addition & 0 deletions b/‎sklearn/tests/test_public_functions.py
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+1Lines changed: 1 addition & 0 deletions
@@ -1186,6 +1186,13 @@ def mean_poisson_deviance(y_true, y_pred, *, sample_weight=None):
     return mean_tweedie_deviance(y_true, y_pred, sample_weight=sample_weight, power=1)
 
 
+@validate_params(
+    {
+        "y_true": ["array-like"],
+        "y_pred": ["array-like"],
+        "sample_weight": ["array-like", None],
+    }
+)
 def mean_gamma_deviance(y_true, y_pred, *, sample_weight=None):
     """Mean Gamma deviance regression loss.
 
 
@@ -152,6 +152,7 @@ def _check_function_param_validation(
     "sklearn.metrics.max_error",
     "sklearn.metrics.mean_absolute_error",
     "sklearn.metrics.mean_absolute_percentage_error",
+    "sklearn.metrics.mean_gamma_deviance",
     "sklearn.metrics.mean_pinball_loss",
     "sklearn.metrics.mean_squared_error",
     "sklearn.metrics.mean_tweedie_deviance",