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Wen-song Ye

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#machine learning Preprint Sep 2026

Frozen Cores Need Task Signal: Fisher-Whitened Cross-Covariance for Low-Resource LLM Adaptation

FCCA, which estimates the signed input--error cross-covariance, whitens it with diagonal Fisher moments, truncates it in the resulting local metric, maps the selected directions back, and applies thin QR to obtain stable core coordinates, shows that a carefully selected fixed span can recover most of the benefit of mov...

Wen-Song Ye, Zhan-Ming Shen, Zhiqing Xiao et al. · 1 citation · ⚡1
Preprint Jul 2026

Semantically Similar, Logically Distinct: Diagnosing the Semantic-Answerability Gap in Table RAG

This work introduces TCR-Bench, a diagnostic benchmark for Table Content-level Answerability in RAG, and tests whether a lightweight two-stage pipeline, Answerability-Aware Reranking (AAR), applying direct query-table answerability judgment, can recover performance.

Jiaming Tian, Liyao Li, Wen-song Ye et al. · 0 citations
Jul 2026

Reasoning Error from Known Fact: Step-Level Self-Consistency Group Relative Policy Optimization for LLM

This work conducts a fine-grained analysis of hallucinations arising in LLM reasoning and finds that the reasoning traces are particularly prone to Context-Sensitive Factual Hallucinations: cases where the model actually has the relevant knowledge, yet makes factual errors due to contextual interference during reasonin...

Xiaomeng Hu, Jiaqi Hu, Hao Chen et al. · 0 citations

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