IBM's Cross-Encoder Query Expansion Boosts Hybrid Search Recall

IBM introduced CE-QE, a novel Cross-Encoder Query Expansion method that leverages semantic evidence to extract key terms and expand BM25 queries. This approach effectively resolves vocabulary mismatch issues and significantly improves lexical recall in hybrid search without modifying the underlying index.

2026-08-04 ~ 2026-08-06 · 3 related posts

• IBM paper expands BM25 with cross-encoder terms to close the retrieval gap — _reachsumit · 2026-08-04
• IBM Introduces Cross-Encoder Query Expansion to Boost Hybrid Search Recall — burkov · 2026-08-06

1 near-duplicate retellings: burkov