**Script output**::

  Training n-slack dual structural SVM
  no additional constraints
  Score with pystruct n-slack ssvm: 0.922222 (took 7.145980 seconds)
  Training 1-slack dual structural SVM
  new constraint too weak.
  no additional constraints
  Score with pystruct 1-slack ssvm: 0.908889 (took 0.296195 seconds)
  Training primal subgradient structural SVM
  final objective: 2421.468743
  Score with pystruct subgradient ssvm: 0.908889 (took 2.438877 seconds)
  Score with sklearn and libsvm: 0.920000 (took 0.215917 seconds)

