Recommendation on signed social rating networks is studied through an innovative approach. Bayesian probabilistic modeling is used to postulate a realistic generative process, wherein user and item interactions are explained by latent factors, whose relevance varies within the underlying network organization into user communities and item groups. Approximate posterior inference captures distrust propagation and drives Gibbs sampling to allow rating and (dis)trust prediction for recommendation along with the unsupervised exploratory analysis of network organization. Comparative experiments reveal the superiority of our approach in rating and link prediction on  Epinions  and  Ciao , besides community quality and recommendation sensitivity to network organization.
['Gianni Costa', 'Riccardo Ortale']
Model-Based Collaborative Personalized Recommendation on Signed Social Rating Networks