Author

Bruno Ribeiro

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Preprint Oct 2026

DeclineCraft: A RAG Abstention Benchmark for Jointly Measuring Combined Retrieval and Parametric Knowledge

Reliable retrieval-augmented generation (RAG) requires recognizing when neither retrieved documents nor parametric knowledge supports an answer. We introduce DeclineCraft, a dynamic abstention benchmark whose unanswerable questions target Minecraft feature additions after a corpus cut-off, with audits of possible param...

Atharva Thakur, Abulhair Saparov, Bruno Ribeiro · 0 citations

#machine learning Preprint Oct 2026

Ori: Drift-Aware Streaming $k$-PCA for Very Low-Rank LLM Training

A prominent family of low-rank LLM optimizers, pioneered by GaLore, performs gradient-subspace projection: at each step, they project the gradient into a low-dimensional subspace and map the update back to the full model. Most existing work either recomputes the gradient subspace at certain intervals, or performs post-...

Xin-Yu Luo, Jin-Cheng Zhou, Meng-Bo Wang et al. · 0 citations