|Speaker :||Francesca Bassi|
|Time:||11:00 am - 12:00 pm|
|Location:||Paris-Rennes Room (EIT Digital)|
We consider the problem of a multiagent system where entities meet and interact in a pairwise fashion. Agents may rate the outcome of the interaction (e.g., on a discrete scale). In time, this allows to build a reputation score for each agent. The aim of this talk is to explore how the reputation is represented, using a Bayesian approach, in the Beta and Dirichlet reputation systems. The Dirichlet reputation system is the foundation of Subjective Logic, which is a probabilistic logic system that allows to explicitly represent uncertainty along with beliefs. Subjective logic, which provides among other things a formalism to treat transitivity of trust, is very useful in the representation of trust networks.
 A. Josang and R. Ismail, The beta reputation system, Proc. of the 15th bled electronic commerce conference, 2002.
 A. Josang and H. Jochen, Dirichlet reputation systems, Proc. of the Second IEEE International Conference on Availability, Reliability and Security (ARES), 2007.
 A. Josang, Subjective Logic: A formalism for reasoning under uncertainty, Springer Verlag, 2016.