After RRF fusion in hybrid search, multiply score by (1 + α × keyword_overlap) where α defaults to 0.3. Rescues exact terminology matches that embedding similarity might rank lower. Inspired by MemPalace (MIT) hybrid v1 (+1.2pp on LongMemEval). Config: KEYWORD_OVERLAP_BOOST env var.
After RRF fusion in hybrid search, multiply score by (1 + α × keyword_overlap) where α defaults to 0.3. Rescues exact terminology matches that embedding similarity might rank lower. Inspired by MemPalace (MIT) hybrid v1 (+1.2pp on LongMemEval). Config: KEYWORD_OVERLAP_BOOST env var.