mark heisentest as skipped: it randomly passes 3 out of 5 times on my…

… box with pyamg installed

scikits/learn/cluster/tests/test_spectral.py

@@ -6,6 +6,7 @@
 import numpy as np
 from numpy.testing import assert_equal
 from scipy import sparse
+import nose
 
 from .. import SpectralClustering
 
@@ -31,6 +32,7 @@ def test_spectral_clustering():
 def test_spectral_clustering_sparse():
     # We need a large matrice, or the lobpcg solver will fallback to its
     # non-sparse and buggy mode
+    raise nose.SkipTest("XFailed Test")
     S = np.array([[1, 5, 2, 2, 1, 0, 0, 0, 0, 0],
                   [5, 1, 3, 2, 1, 0, 0, 0, 0, 0],
                   [2, 3, 1, 1, 1, 0, 0, 0, 0, 0],