The VANGUARD team, led by Ana-Maria Luisa Mocanu, secured first place in the JOKER 2026 Track Task 1 English competition with their IROH system. IROH utilizes a multi-stage retrieval process combining hybrid sparse-dense retrieval, cross-encoder reranking, and an ensemble of LoRA-adapted LLM judges. Key findings from their ablation studies indicate that rationale-distilled LLM judges significantly improve ranking quality, while structured hard negatives generally degrade generalization performance. AI
IMPACT Demonstrates advanced LLM techniques for information retrieval and ranking tasks, potentially influencing future search and recommendation systems.
RANK_REASON Academic paper detailing a novel system for humor ranking in a competition. [lever_c_demoted from research: ic=1 ai=1.0]
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