3 papers
cs.IR2026
CASP: Support-Aware Offline Policy Selection for Two-Stage Recommender Systems
Nilson Chapagain
Two-stage recommender systems first choose a candidate generator and then rank items within the generated set. Because the generator decides which items are available to the ranker…
math.ST2025
On Fisher Consistency of Surrogate Losses for Optimal Dynamic Treatment Regimes with Multiple Categorical Treatments per Stage
Nilanjana Laha, Nilson Chapagain, Victoria Cicherski +1
Patients with chronic diseases often receive treatments at multiple time points, or stages. Our goal is to learn the optimal dynamic treatment regime (DTR) from longitudinal patien…
math.OC2025
Optimal Control of Several Motion Models
Tan H. Cao, Nilson Chapagain, Haejoon Lee +2
This paper is devoted to the study of the dynamic optimization of several controlled crowd motion models in the general planar settings, which is an application of a class of optim…