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Bo Han

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#natural language process... Preprint Oct 2026

Decouple to Forget: Semantic Mediation for Sensitive Unlearning in Large Language Models

Machine unlearning for large language models seeks to remove specified knowledge while preserving general capability, yet current methods often treat an entire response as the unit of forgetting. This coarse granularity causes unnecessary utility loss when the forget target is only a small set of sensitive facts embedd...

Jing-Yue Cong, Anyang Song, Yang Yu et al. · 0 citations
#machine learning Preprint Oct 2026

Rethinking Faithfulness in LLMs: A Pairwise Context-Sensitive Perspective

Large language models (LLMs) are expected to answer questions faithfully based on the provided context, abstaining when the context information is insufficient to answer the questions. Existing faithfulness evaluations typically assess each question-context instance in isolation; however, such instance-level evaluation...

Zi-Zhuo Zhang, Xiong Peng, Jing-Wei Sun et al. · 0 citations
#machine learning Preprint Sep 2026

Bayes-Sufficient Compression Is Not Enough: How Does Communication Help Multi-Agent Systems?

Multi-agent LLM systems pair a sender with broad context and an executor with a limited local view. We study when a short message improves the executor's next decision, when raw context is preferable, and when a stronger sender helps. Our framework, \emph{receiver-relative bounded coordination}, expresses message utili...

Yi Xie, Zhan-Ke Zhou, Yi-Sheng Fan et al. · 0 citations
#artificial intelligence Preprint Oct 2026

Test-time Calibration Learning for Large Language Model Reasoning

Reliable large language models (LLMs) must not only produce accurate answers but also express confidence that faithfully reflects their probability of being correct. Such calibration is essential for identifying uncertain predictions and supporting reliable decision-making in real-world deployment. Recent studies incor...

Zi-Zhuo Zhang, Xiong Peng, Jing-Wei Sun et al. · 0 citations
#small language model Preprint Sep 2026

Taming CoT Obfuscation in VLMs: From Mechanistic Evidence to Activation Enforcement

This work proposes Targeted Anti-obfuscation with Mechanistic Enforcement (TAME), which uses Sparse Autoencoders (SAEs) to combine behavioral feedback with targeted suppression of template-associated activations during RL, providing a path from behavioral monitoring to representation-level oversight for more auditable...

Xu-Tao Mao, Jianing Zhu, Jin-Man Zhao et al. · 0 citations
#machine learning Preprint Sep 2026

DE-Venus: A Data-Efficient RLVR Framework for Large Language Models

DE-Venus is presented, a unified framework for data-efficient RLVR that treats supervision as evolving state across data preparation and policy optimization and reduces annotation and training costs without sacrificing scalable RL execution.

Shen-Zhi Yang, Guang-Cheng Zhu, Kai Tang et al. · 0 citations
Preprint Aug 2026

Towards Understanding On-Policy Distillation through the Lens of Test-Time Scaling

It is observed that OPD-trained models maintain superior avg@K performance across sampling budgets, while the advantage in pass@K gradually shifts to the pre-OPD base models as K increases, suggesting that OPD primarily improves sampling efficiency rather than consistently expanding the student's reasoning capability b...

Xinmu Ge, Zi-Zhuo Zhang, Yu Huang et al. · 5 citations · ⚡1

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