Lexical Reranker

Software componentKnowledge & DataKnowledge & Dataarc:LexicalReranker

A reranker that applies keyword (BM25) scoring only to the top vector-search candidates instead of fusing over the full collection.

Responsibility. Re-scores a vector-search shortlist by lexical relevance.

Variant of Reranker abstract

When to choose. Choose instead of full hybrid fusion for extremely latency-sensitive applications (sub-50 ms p99) that still need keyword precision.

Direct neighbourhood (hover for relationship types)

Relationships

is invoked by dependency

Vector Retriever abstract Ch6.2B

Classification

Patterns: BM25 rescoring of top-100 candidates
Quality attributes: Performance efficiency (ISO/IEC 25010)

Sources

Ch6.2B: T. Nguyen, "Production Vector Database Deployment," in Mastering Agentic AI Systems: Guide for the NVIDIA NCP-AAI Exam, 1st ed. 2026, ch. 6.2B. ISBN: 9798244538229.