CONF Valente_IEEEINTERNATIONALCONFERENCEONSYSTEMS,MANANDCYBERNETICS_2011/IDIAP Understanding Social Signals in Multi-party Conversations: Automatic Recognition of Socio-Emotional Roles in the AMI Meeting Corpus Valente, Fabio Vinciarelli, Alessandro Yella, Sree Harsha Sapru, A. Proceedings of the IEEE International Conference on Systems, Man and Cybernetics 2011 374-379