28 citations · 120 across the 12 of their papers we have counts for
4 papers · 1 filter
Faster Perturbed Stochastic Gradient Methods for Finding Local Minima
Zixiang Chen, Dongruo Zhou, Quanquan Gu
Escaping from saddle points and finding local minimum is a central problem in nonconvex optimization. Perturbed gradient methods are perhaps the simplest approach for this problem.…
High temporal resolution total-body dynamic PET imaging based on pixel-level time-activity curve correction
Zixiang Chen, Yaping Wu, Na Zhang +5
Dynamic positron emission tomography (dPET) is currently a widely used medical imaging technique for the clinical diagnosis, staging and therapy guidance of all kinds of human canc…
Self-training Converts Weak Learners to Strong Learners in Mixture Models
Spencer Frei, Difan Zou, Zixiang Chen +1
We consider a binary classification problem when the data comes from a mixture of two rotationally symmetric distributions satisfying concentration and anti-concentration propertie…
Almost Optimal Algorithms for Two-player Zero-Sum Linear Mixture Markov Games
Zixiang Chen, Dongruo Zhou, Quanquan Gu
We study reinforcement learning for two-player zero-sum Markov games with simultaneous moves in the finite-horizon setting, where the transition kernel of the underlying Markov gam…