new_contents: import numpy as np
  from nose.tools import assert_true, assert_false, assert_equal, assert_almost_equal, assert_raises
  from numpy.testing import assert_array_equal, assert_array_almost_equal
  from dipy.data import get_data
  from dipy.segment.quickbundles import QuickBundles
  
  
  def test_qbundles():
      streams,hdr = nib.trackvis.read(get_data('fornix'))    
      T=[s[0] for s in streams]
      Trk=np.array(T, dtype=np.object)    
      qb=QuickBundles(T,10.,12)
      Tqb=qb.virtuals()    
      #Tqbe,Tqbei=qb.exemplars(T)
      Tqbe,Tqbei=qb.exemplars()    
      assert_equal(4,qb.total_clusters())
  
subject: TEST for QuickBundles