Definition

SP+ Extension: Strict Parity Plus a Learned Reranker, Reported Separately

SP+ is the paper's notational extension of strict parity. Where strict parity (SP) fixes encoder, candidate pool size mm, cutoff kk, split, and exact-ID matching rule across compared systems, SP+ additionally allows a learned reranker on top of the shared dense candidate pool. SP+ results are reported in a separate column from SP so that any reranker-driven gain is not silently folded into a strict-parity headline number. SP+ is meaningful only relative to the underlying SP contract, so the SP definition is a direct prerequisite.

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Updated 2026-05-18

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Auditable Strict-Parity Evaluation of Prerequisite-Graph Retrieval for RAG under Leakage Controls