（本报记者亓玉昆、刘军国整理）
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Abstract:Humans shift between different personas depending on social context. Large Language Models (LLMs) demonstrate a similar flexibility in adopting different personas and behaviors. Existing approaches, however, typically adapt such behavior through external knowledge such as prompting, retrieval-augmented generation (RAG), or fine-tuning. We ask: do LLMs really need external context or parameters to adapt to different behaviors, or do they already have such knowledge embedded in their parameters? In this work, we show that LLMs already contain persona-specialized subnetworks in their parameter space. Using small calibration datasets, we identify distinct activation signatures associated with different personas. Guided by these statistics, we develop a masking strategy that isolates lightweight persona subnetworks. Building on the findings, we further discuss: how can we discover opposing subnetwork from the model that lead to binary-opposing personas, such as introvert-extrovert? To further enhance separation in binary opposition scenarios, we introduce a contrastive pruning strategy that identifies parameters responsible for the statistical divergence between opposing personas. Our method is entirely training-free and relies solely on the language model's existing parameter space. Across diverse evaluation settings, the resulting subnetworks exhibit significantly stronger persona alignment than baselines that require external knowledge while being more efficient. Our findings suggest that diverse human-like behaviors are not merely induced in LLMs, but are already embedded in their parameter space, pointing toward a new perspective on controllable and interpretable personalization in large language models.
常睿开始认真研究考研院校、专业与导师，最终将目标锁定在中国艺术研究院的中国文化史与思想史方向。从下定决心到走上考场，留给她的复习时间，仅仅只有四个月。
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I attended the trial and sat near the defendant’s table so that I could watch Friedmann’s reactions. If only he’d exhibited any. I’ve been in many courtrooms, but I’ve never seen a defendant, or possibly anyone anywhere, sit so inertly for so long. He took notes and occasionally whispered to his lawyers, but otherwise was lithic in his stillness. I saw him express something like emotion only once, when Hall testified.。关于这个话题，WPS下载最新地址提供了深入分析