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原文摘要

High-precision text reranking is a critical component in modern search, recommendation, and agentic retrieval-augmented generation (RAG) systems. We present Yuanbao-Reranker, a family of general-purpose dense rerankers spanning 0.6B, 4B, and 8B parameter scales built upon the Qwen3 backbone. To construct diverse and reliable ranking supervision at scale, we pair answer-first and query-type-guided document-grounded synthesis with a three-stage curation funnel that verifies positive support, eliminates semantic redundancy, and enforces balanced source-by-length quotas. For each curated pair, we screen real retrieval pools with a teacher score margin to filter out potential false negatives and sample Hard, Medium, and Moderate negative tiers, yielding 2.75M $1{:}3$ ranking groups. We train the models by jointly optimizing pointwise relevance cross-entropy and a bounded minimum-gap hinge objective over both positive--negative and negative--negative pairs. This formulation transfers fine-grained teacher preferences across candidate tiers without over-constraining well-separated predictions, supporting both cross-scale and same-scale distillation followed by layerwise adaptive model merging. Across five comprehensive benchmarks spanning Chinese (CMTEB-R), multilingual (MMTEB-R), English (BEIR), long-document (MLDR), and code (MTEB-Code) retrieval, Yuanbao-Reranker consistently leads every parameter tier: the 0.6B variant reaches 70.96 Avg. to surpass 1B--4B active-parameter baselines, the 4B variant reaches 73.63 Avg. to outperform the 8B teacher (72.68), and the 8B variant achieves a state-of-the-art 74.21 Avg., with substantial gains generalizing across distinct first-stage retrievers.