Davit Khachaturyan

By his own description, a “Senior AI Search and Retrieval Engineer focused on building and improving production search, RAG, and knowledge-driven AI systems.” No employer is named in the material held here.

Writes at medium.com/@davit.khachaturyan.03.

Contributions in This Vault

• Hybrid Fusion Failure - BM25 Displacing Reference Documents — a production post-mortem on adding BM25 to a vector retriever and losing the correct document from the candidate set entirely, because a bool/should query sums an unbounded lexical score with a bounded vector score

The write-up is notable for locating the failure at candidate selection rather than in either retrieval branch, and for reporting an honest partial remedy — capping BM25’s contribution to the merged set at three documents — described as a patch rather than a fix.

Concepts

• Hybrid Search
• Linear Score Combination
• BM25
• Retrieval Pipeline
• Reranking
• RAG