On CJEU paragraph retrieval, BM25 beats off-the-shelf dense models on most metrics, fine-tuned dense models beat BM25, and BM25 wins mainly when queries have less verbatim overlap with the target.
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Assessing the Performance Gap Between Lexical and Semantic Models for Information Retrieval With Formulaic Legal Language
On CJEU paragraph retrieval, BM25 beats off-the-shelf dense models on most metrics, fine-tuned dense models beat BM25, and BM25 wins mainly when queries have less verbatim overlap with the target.