DOC improve documentation of GradientBoosting.oob_improvement_ (scikit-learn#15204)

Kevad · rth · commit a59562d414a8 · 2019-10-13T14:40:46.000+02:00
diff --git a/sklearn/ensemble/gradient_boosting.py b/sklearn/ensemble/gradient_boosting.py
@@ -2011,6 +2011,7 @@ class GradientBoostingClassifier(ClassifierMixin, BaseGradientBoosting):
         relative to the previous iteration.
         ``oob_improvement_[0]`` is the improvement in
         loss of the first stage over the ``init`` estimator.
+        Only available if ``subsample < 1.0``
 
     train_score_ : array, shape (n_estimators,)
         The i-th score ``train_score_[i]`` is the deviance (= loss) of the
@@ -2480,6 +2481,7 @@ class GradientBoostingRegressor(RegressorMixin, BaseGradientBoosting):
         relative to the previous iteration.
         ``oob_improvement_[0]`` is the improvement in
         loss of the first stage over the ``init`` estimator.
+        Only available if ``subsample < 1.0``
 
     train_score_ : array, shape (n_estimators,)
         The i-th score ``train_score_[i]`` is the deviance (= loss) of the
