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Rank1: Test-Time Compute for Reranking in Information Retrieval

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arxiv 2502.18418 v2 pith:OGAI753B submitted 2025-02-25 cs.IR cs.CLcs.LG

Rank1: Test-Time Compute for Reranking in Information Retrieval

classification cs.IR cs.CLcs.LG
keywords computemodelrank1reasoningperformancetest-timedatasetexplainable
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We introduce Rank1, the first reranking model trained to take advantage of test-time compute. Rank1 demonstrates the applicability within retrieval of using a reasoning language model (i.e. OpenAI's o1, Deepseek's R1, etc.) for distillation in order to rapidly improve the performance of a smaller model. We gather and open-source a dataset of more than 600,000 examples of R1 reasoning traces from queries and passages in MS MARCO. Models trained on this dataset show: (1) state-of-the-art performance on advanced reasoning and instruction following datasets; (2) work remarkably well out of distribution due to the ability to respond to user-input prompts; and (3) have explainable reasoning chains that can be given to users or RAG-based systems. Further, we demonstrate that quantized versions of these models retain strong performance while using less compute/memory. Overall, Rank1 shows that test-time compute allows for a fundamentally new type of explainable and performant reranker model for search.

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