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Jin-Man Zhao

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#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
#artificial intelligence Preprint Feb 2026

Not All Preferences Deserve Gradients: Understanding Gradient Utility in Offline Reasoning Alignment

SAGE (Stability-Aware Gradient Efficiency), which maintains difficulty-stratified candidate pools refreshed during training and selects pairs within each pool by a forward-pass signal-to-curvature score, outperforms full-data and size-matched baselines while producing substantially smoother optimization trajectories.

Hui Wu, Hengyi Cai, Jin-Man Zhao et al. · 0 citations
#machine learning Preprint Sep 2026

Act More, Decide Less: Skill-Guided Adaptive Action Chunking for Long-Horizon LLM Agents

SPACE induces two-level programmatic skills from successful trajectories, where subskill boundaries serve as direct chunk-boundary supervision from trajectory-induced programmatic skills, and distilled into a primitive-chunk policy via hybrid on-/off-policy optimization.

Yan-Ting Yang, Can Jin, Jin-Man Zhao et al. · 1 citation

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