Search Results for author: Zhihao Xu

Found 3 papers, 0 papers with code

Uncovering Safety Risks in Open-source LLMs through Concept Activation Vector

no code implementations18 Apr 2024 Zhihao Xu, Ruixuan Huang, Xiting Wang, Fangzhao Wu, Jing Yao, Xing Xie

Even when successful, the harmfulness of their outputs cannot be guaranteed, leading to suspicions that these methods have not accurately identified the safety vulnerabilities of LLMs.

A Unified Frequency Domain Cross-Validatory Approach to HAC Standard Error Estimation

no code implementations13 Aug 2021 Zhihao Xu, Clifford M. Hurvich

A unified frequency domain cross-validation (FDCV) method is proposed to obtain a heteroskedasticity and autocorrelation consistent (HAC) standard error.

Dynamical evolution in a one-dimensional incommensurate lattice with $\mathcal{PT}$ symmetry

no code implementations14 Jan 2021 Zhihao Xu, Shu Chen

We investigate the dynamical evolution of a parity-time ($\mathcal{PT}$) symmetric extension of the Aubry-Andr\'{e} (AA) model, which exhibits the coincidence of a localization-delocalization transition point with a $\mathcal{PT}$ symmetry breaking point.

Disordered Systems and Neural Networks

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