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cs.CL2026
GroupDPO: Memory-Efficient Group-Wise Direct Preference Optimization
Jixuan Leng, Si Si, Hsiang-Fu Yu +2
Preference optimization is widely used to align Large Language Models (LLMs) with preference feedback. However, most existing methods train on a single positive-negative pair per p…
cs.CR2026
Missing Mass for Differentially Private Domain Discovery
Travis Dick, Matthew Joseph, Vinod Raman
We study several problems in differentially private domain discovery, where each user holds a subset of items from a shared but unknown domain, and the goal is to output an informa…
stat.ML2026
On Generation in Metric Spaces
Jiaxun Li, Vinod Raman, Ambuj Tewari
We study generation in separable metric instance spaces. We extend the language generation framework from Kleinberg and Mullainathan [2024] beyond countable domains by defining nov…