collaborators

6 papers

stat.ME2026

Optimal Watermark Localization in Mixed-Source Large Language Model Texts

Jose H. Blanchet, T. Tony Cai, Xiang Li +3

Watermarking provides a principled way to authenticate text generated by large language models (LLMs). In practice, however, the final text may be mixed-source, with watermark evid…

cs.CR2026

Selective Disclosure Watermarking for Large Language Models

Xuyang Chen, Xiang Li, Yangxinyu Xie +1

Watermarking methods embed imperceptible and verifiable signals into text generated by large language models (LLMs). Existing approaches include zero-bit schemes for distinguishing…

cs.LG2026

UCS: Estimating Unseen Coverage for Improved In-Context Learning

Jiayi Xin, Xiang Li, Evan Qiang +4

In-context learning (ICL) performance depends critically on which demonstrations are placed in the prompt, yet most existing selectors prioritize heuristic notions of relevance or…

cs.LG2026

Improving the Trade-off Between Watermark Strength and Speculative Sampling Efficiency for Language Models

Weiqing He, Xiang Li, Li Shen +2

Watermarking is a principled approach for tracing the provenance of large language model (LLM) outputs, but its deployment in practice is hindered by inference inefficiency. Specul…

cs.LG2026

On the Empirical Power of Goodness-of-Fit Tests in Watermark Detection

Weiqing He, Xiang Li, Tianqi Shang +3

Large language models (LLMs) raise concerns about content authenticity and integrity because they can generate human-like text at scale. Text watermarks, which embed detectable sta…

math.ST2025

Optimal Detection for Language Watermarks with Pseudorandom Collision

T. Tony Cai, Xiang Li, Qi Long +2

Text watermarking plays a crucial role in ensuring the traceability and accountability of large language model (LLM) outputs and mitigating misuse. While promising, most existing m…