Recommender systems have become ubiquitous over the last decade, providing users with
personalized search results, video streams, news excerpts, and purchasing hints. Human …

We consider a nonstationary sequential stochastic optimization problem in which the
underlying cost functions change over time under a variation budget constraint. We propose …

We consider a non-stationary sequential stochastic optimization problem, in which the
underlying cost functions change over time under a variation budget constraint. We propose …