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Yi Xie

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#machine learning Preprint Sep 2026

ImpossibleRubrics: Stress-Testing Generated Rubrics as Reward Signals

ImpossibleRubrics is introduced, a benchmark of 169 impossible tasks spanning six impossibility categories, each paired with a verifiable oracle certificate specifying what an honest answer may and may not claim, together with 48 answerable controls.

Bo-Wen Qin, Yi Xie, Ye-Sheng Liu et al. · 1 citation
Jul 2026

Agent Retrieval Bench: Evaluating Repository Context Retrieval for Coding Agents

A controlled seed-intervention pilot finds that retrieval-derived initial context yields higher file F1 with less post-seed exploration than random non-gold context, while oracle gold context shows substantial remaining headroom.

Bowen Qin, Yi Xie · 0 citations
Jul 2026

PERFOPT-Bench: Evaluating Coding Agents on Software Performance Optimization

The results show that optimization performance is workload-dependent rather than determined by model identity alone: no single stack dominates, and changing the agent framework can materially change the same LLM's per-task speedup profile.

YI-YING Cui, Yi Xie, Piaohong Wang et al. · 0 citations

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