I model how people disagree, then use that to personalize and align LLMs.
Hi! I’m a fourth-year PhD student at the University of Michigan School of Information (UMSI), advised by David Jurgens in the Blablablab. I received a BA in Statistics and Data Science from UC Berkeley in 2023.
My research is on pluralistic alignment: modeling how individuals and groups differ in their judgments, and using those representations to personalize and align LLMs. Standard practice aggregates labels into a single “gold standard,” treating disagreement as noise. On subjective tasks, though, disagreement is often meaningful, rooted in who the annotator is and how the task is framed. I build models that preserve it instead of averaging it away.
- DEM-MoE models annotator disagreement with demographic-aware experts that capture structured, group-level variation in judgments (ACL 2026, oral).
- VISTA, built during my R&D internship at Kitware, infers a user’s values from a few survey answers and steers a frozen LLM toward them, beating prompt-based personalization with no added prompt tokens (under review, ARR).
Recent Publications
- Under Review · ARR Xu, Y., Adams, J., Hu, B., Kumar, S., Jurgens, D., & Basharat, A. (2026). VISTA: Steering LLMs with latent user values inferred from a few survey answers. [arXiv]
- ACL 2026 · Oral Xu, Y., Derricks, V., Earl, A., & Jurgens, D. (2026). Modeling annotator disagreement with demographic-aware experts and synthetic perspectives. [paper] [code]
- EMNLP 2026 · Oral Xu, Y., & Jurgens, D. (2026). Beyond consensus: Perspectivist modeling and evaluation of annotator disagreement in NLP. [arXiv]
- NAACL 2025 Xu, Y.*, Chen, H.*, Rakshit, S., et al., & Jurgens, D. (2025). Causally modeling the linguistic and social factors that predict email response. [paper] (*equal contribution)
Currently
I’m building B-HAP, a hierarchical Bayesian framework that generates per-annotator LoRA adapters from task, data, and annotator features, pooling behavior across population, subgroup, and individual levels — extending the same pluralistic-alignment approach behind VISTA to richer, adapter-based personalization.
