use qpbo in perceptron test if available
use qpbo in perceptron test if available

amueller/pystruct,pystruct/pystruct,d-mittal/pystruct,amueller/pystruct,wattlebird/pystruct,massmutual/pystruct,massmutual/pystruct,wattlebird/pystruct,pystruct/pystruct,d-mittal/pystruct