Which System Differences Matter? Using L1/L2 Regularization to Compare Dialogue Systems José González-Brenes author Jack Mostow author 2011-06 text Proceedings of the SIGDIAL 2011 Conference Joyce Y Chai editor Johanna D Moore editor Rebecca J Passonneau editor David R Traum editor Association for Computational Linguistics Portland, Oregon conference publication gonzalez-brenes-mostow-2011-system https://aclanthology.org/W11-2003/ 2011-06 8 17