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Bohan Zhang

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#artificial intelligence Preprint Sep 2026

Persona Following Is Not Selective Control: The Neutrality Gap in LLM User Simulation

A systematic failure of selective control is identified and a disparity, the neutrality gap, demonstrates that successful persona following does not imply selective persona control, which additionally requires keeping non-target attributes stable.

Jia-Shen Ren, Wen-Lin Zhang, Bo-Han Zhang et al. · 0 citations
Preprint Aug 2026

Weightless Fine-Tuning: Personalizing LLMs via Logit-Space Transport

Weightless Fine-Tuning is proposed, a training-free decoding-time method that approximates the distributional effect of SFT without weight updates and achieves the best average performance across datasets, matches or exceeds SFT on individual tasks, and outperforms other lightweight baselines on average.

Bo-Han Zhang, An-Qi Ni, Yi-Xin Wang et al. · 0 citations

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