Walk from Baseline Search to Hybrid Retrieval
Sequence hybrid retrieval upgrades without losing the ability to measure each contribution.
Upgrade pressure A Monday deadline tempts the team to replace working lexical search with vectors. Advanced teams keep the baseline alive so they can measure what each new layer adds. Layered retrieval Baseline -> Dense -> Fusion -> Rerank Each layer has a job and a cost. The sequence protects exact-match trust while adding semantic reach. React Replace BM25 with vectors Better recall without losing exact evidence. An upgrade is only real if you can show which layer improved which query class. 01 Baseline 02 Fusion 03 Rerank Protect exact terms BM25 gets exact error codes right but misses symptom…
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