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Xiaoyan Bai

4 accepted papers

2025

Concept Incongruence: An Exploration of Time and Death in Role Playing

NeurIPS 2025poster

Consider this prompt "Draw a unicorn with two horns". Should large language models (LLMs) recognize that a unicorn has only one horn by definition and ask users for clarifications, or proceed to generate something anyway? We introduce *concept incongruence* to capture such phenomena where concept bo…

Cited by 0SourcecodeScholar
2024

A Mechanistic Understanding of Alignment Algorithms: A Case Study on DPO and Toxicity

ICML 2024oral

While alignment algorithms are commonly used to tune pre-trained language models towards user preferences, we lack explanations for the underlying mechanisms in which models become ``aligned'', thus making it difficult to explain phenomena like jailbreaks. In this work we study a popular algorithm,…

2024

Learn To be Efficient: Build Structured Sparsity in Large Language Models

NeurIPS 2024spotlight

Large Language Models (LLMs) have achieved remarkable success with their billion-level parameters, yet they incur high inference overheads. The emergence of activation sparsity in LLMs provides a natural approach to reduce this cost by involving only parts of the parameters for inference. However, e…

Cited by 14SourcePDFScholar
2023

PromptRank: Unsupervised Keyphrase Extraction Using Prompt

ACL 2023long

The keyphrase extraction task refers to the automatic selection of phrases from a given document to summarize its core content. State-of-the-art (SOTA) performance has recently been achieved by embedding-based algorithms, which rank candidates according to how similar their embeddings are to documen…