Merge pull request #4796 from joshloyal/standard-scaler-std-doc

amueller · amueller · commit 98ca513ad269 · 2015-06-10T13:39:11.000-04:00
[MRG+1] Updated _std docstring in StandardScaler to make internal handling of zero values explicit.
diff --git a/sklearn/preprocessing/data.py b/sklearn/preprocessing/data.py
@@ -327,7 +327,8 @@ class StandardScaler(BaseEstimator, TransformerMixin):
         The mean value for each feature in the training set.
 
     std_ : array of floats with shape [n_features]
-        The standard deviation for each feature in the training set.
+        The standard deviation for each feature in the training set. 
+        Set to one if the standard deviation is zero for a given feature.
 
     See also
     --------
