Author

Zi-Niu Liu

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Review Oct 2026

Pix2Evidence: A Multimodal RAG System for Text and Visual Evidence

Retrieval-augmented generation (RAG) over visually rich documents must find both relevant content and the evidence that supports an answer. Screenshot retrieval preserves images and page structure, but written facts within screenshots also need to be searchable. Moreover, topical relevance alone does not identify which...

Zi-Niu Liu, Xiaoyang Chen, De-Zhi Ye et al. · 0 citations

#natural language process... Conference Open access Oct 2026

DP-ES: Differentially Private Evolution Strategies for Prompt Optimization

Token-level differentially private (DP) prompt optimization methods such as DP-OPT can become unstable under tight privacy budgets: on GSM8K, DP-OPT obtains $49.5\pm28.5\%$ across 30 runs, and a logged search trajectory reveals prompt-template drift and noise-sensitive irreversible choices. We diagnose these as structu...

Zi-Niu Liu, Ai-Ping Li, Yue Han et al. · Proceedings of the 2026 Conf... · 0 citations

Preprint Aug 2026

Beyond Full-Model Rollback: AuroSFT for Adapter-State Multi-Task Fine-Tuning

AuroSFT is introduced, a parameter-efficient framework that recasts the carried state of overfitting-aware multi-task SFT as a compact, mergeable adapter state and obtains higher accuracy on all five backbones.

Yue Han, Zi-Niu Liu · 0 citations