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ScienceTowards Data Scienceabout 2 hours ago
How Does a RAG Reranker Really Work?A RAG reranker is a cross-encoder that scores query-passage pairs jointly, but its dominant learned signal is keyword co-occurrence, not answering. It runs 30 to 100 times slower per query than an embedder. The mechanism transfers only when corpus vocabulary resembles MS MARCO training data.
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