Fix memory access error in OneClassSVM

Author: amueller

sklearn/svm/classes.py

@@ -7,6 +7,7 @@
     LinearModel
 from ..feature_selection.from_model import _LearntSelectorMixin
 from ..utils import check_X_y
+from ..utils.validation import _num_samples
 
 
 class LinearSVC(BaseEstimator, LinearClassifierMixin,
@@ -1011,7 +1012,7 @@ def fit(self, X, y=None, sample_weight=None, **params):
         If X is not a C-ordered contiguous array it is copied.
 
         """
-        super(OneClassSVM, self).fit(X, [], sample_weight=sample_weight,
+        super(OneClassSVM, self).fit(X, np.ones(_num_samples(X)), sample_weight=sample_weight,
                                      **params)
         return self