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Zaiyan Xu

3 accepted papers

2025

Robust LLM Alignment via Distributionally Robust Direct Preference Optimization

NeurIPS 2025poster

A major challenge in aligning large language models (LLMs) with human preferences is the issue of distribution shift. LLM alignment algorithms rely on static preference datasets, assuming that they accurately represent real-world user preferences. However, user preferences vary significantly across…

Cited by 0SourceScholar
2023

Improved Sample Complexity Bounds for Distributionally Robust Reinforcement Learning

AISTATS 2023poster

We consider the problem of learning a control policy that is robust against the parameter mismatches between the training environment and testing environment. We formulate this as a distributionally robust reinforcement learning (DR-RL) problem where the objective is to learn the policy which maximi…

2022

Robust Reinforcement Learning using Offline Data

NeurIPS 2022accept

The goal of robust reinforcement learning (RL) is to learn a policy that is robust against the uncertainty in model parameters. Parameter uncertainty commonly occurs in many real-world RL applications due to simulator modeling errors, changes in the real-world system dynamics over time, and adv…