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Author

Xuan-Yu Yin

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#artificial intelligence Preprint Oct 2026

HACHIMI-II: From Role-Play to Learner Behavior Modeling for Faithful Student Simulation

Simulated students let researchers test tutoring systems and teaching strategies before real learners are available, but only if the simulation reproduces where a particular learner succeeds and fails. The common approach asks a large language model to role-play a student, but a role does not model what this learner kn...

Yi-Lin Jiang, Fei Tan, Xuan-Yu Yin et al. · 0 citations
Conference Open access Sep 2026

RIVS: Mitigating Hallucination in Large Vision-Language Models via Representation Intervention on Visual Grounding Shift

This work studies hallucination from the perspective of dynamic representation shift during generation and proposes an online projection-based intervention on intermediate hidden states to suppress the hallucination-related directions, mitigating hallucinations while preserving language quality.

Xuan-Yu Yin, Xiao-Ye Qu, Wei Wei · 0 citations

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