retrieval
2 posts — newest first.
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Hybrid Search Measured: Where Fusion and Reranking Actually Help
BM25, dense, RRF and a cross-encoder reranker on SciFact, with paired confidence intervals. Fusion helped BM25 a lot and dense a little; the reranker hurt.
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Your Chunking Benchmark Is Measuring Chunk Size
14 chunking strategies on SQuAD with answer-span ground truth. Semantic chunking lost to every alternative, and fixed-k scoring hid the thing that mattered.