2 papers
cs.LG2026
On the Suboptimality of GP-UCB under Polynomial Effective Optimism
Wenjia Wang, Xiaowei Zhang
Gaussian process upper confidence bound (GP-UCB) is widely used for sequential optimization of expensive black-box functions. Although many upper bounds on its cumulative regret ha…
stat.ML2026
SPARKLE: A Nonparametric Approach for Online Decision-Making with High-Dimensional Covariates
Wenjia Wang, Qingwen Zhang, Xiaowei Zhang
Personalized services are central to today's digital economy, and their sequential decisions are often modeled as contextual bandits. Modern applications pose two main challenges:…