Nicolas Kourtellis

Privacy Concerns vs. User Behavior in Community Question Answering

2015

Community-based question answering (CQA) platforms are crowd-sourced services for sharing user expertise on various topics, from mechanical repairs to parenting. While they naturally build-in an online social network infrastructure, they carry a very different purpose …

Dynamic Matrix Factorization with Priors on Unknown Values

2015

Advanced and effective collaborative filtering methods based on explicit feedback assume that unknown ratings do not follow the same model as the observed ones not missing at random). In this work, we build on this …