Lesson 3.2
Reranking retrieved candidates
Retrieve broadly, then rerank precisely. A reranker reads query and passage together, which is why it beats vector distance on ordering.
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Overview
What this lesson covers
- Retrieve a wide candidate set, then narrow it
- Score query and passage jointly with a reranker
- Balance the latency cost against the accuracy gain
This lesson sits in Retrieval Quality, part of Retrieval-Augmented Generation from Scratch. It assumes what came before it and leads directly into the next lesson in the module.
In this lesson you will:
- Retrieve a wide candidate set, then narrow it
- Score query and passage jointly with a reranker
- Balance the latency cost against the accuracy gain
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