Merge pull request scikit-learn#2775 from stefan-w/python-3-fix

python 3 compatibility fix

Author: GaelVaroquaux

sklearn/gaussian_process/gaussian_process.py

@@ -48,7 +48,7 @@ def l1_cross_distances(X):
     """
     X = array2d(X)
     n_samples, n_features = X.shape
-    n_nonzero_cross_dist = n_samples * (n_samples - 1) / 2
+    n_nonzero_cross_dist = n_samples * (n_samples - 1) // 2
     ij = np.zeros((n_nonzero_cross_dist, 2), dtype=np.int)
     D = np.zeros((n_nonzero_cross_dist, n_features))
     ll_1 = 0