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Xu Wang

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#artificial intelligence Preprint Sep 2026

Beyond Token Scale: Chunk-Level Sparse Autoencoders for Reliable Semantic Feature Discovery

A family of chunk-level SAEs that encode mean-pooled activations over chunks, each a contiguous span of tokens: Mean-Chunk reconstructs the observed chunk, Cross-Chunk predicts an independently processed neighbor, and Joint-Chunk combines both targets are introduced.

Xu Wang, Yi-Fan Yang, Ting-Ting Yu et al. · 0 citations
Preprint Aug 2026

Mismatch Matters: On-Policy Distillation Beyond Token Agreement

TIDE (Token-level Independent Deficit-Excess correction), which applies bounded Hellinger shaping to suppress the most severe sampled excesses and an analytic teacher top-$K$ injection to restore deficient probability mass without requiring deficit tokens to be sampled, is proposed.

Zi-Chao Yu, Chengzhi Yu, Sheng-Ze Xu et al. · 4 citations
#artificial intelligence Preprint Aug 2026

Enhancing SAE-based Steering via Neighbor Integrated Feature Selection

This paper proposesNeighbor Integrated Feature Selection (NIFS), a plug-and-play strategy that leverages representation similarity to improve feature selection for steering and demonstrates consistent performance gains over conventional top-$k$ selection.

Yutang Liu, Xu Wang, Di-Fan Zou · 1 citation

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