12 citations · 33 across the 9 of their papers we have counts for
4 papers · 1 filter
The discrete moment problem with nonconvex shape constraints
Xi Chen, Simai He, Bo Jiang +2
The discrete moment problem is a foundational problem in distribution-free robust optimization, where the goal is to find a worst-case distribution that satisfies a given set of mo…
A Nearly Instance Optimal Algorithm for Top-k Ranking under the Multinomial Logit Model
Xi Chen, Yuanzhi Li, Jieming Mao
We study the active learning problem of top- ranking from multi-wise comparisons under the popular multinomial logit model. Our goal is to identify the top- items with high p…
Testing independence with high-dimensional correlated samples
Xi Chen, Weidong Liu
Testing independence among a number of (ultra) high-dimensional random samples is a fundamental and challenging problem. By arranging identically distributed -dimensional ra…
A note on the approximate admissibility of regularized estimators in the Gaussian sequence model
Xi Chen, Adityanand Guntuboyina, Yuchen Zhang
We study the problem of estimating an unknown vector from an observation drawn according to the normal distribution with mean and identity covariance matrix under the k…