Evaluating retrieval

Before blaming the model for a bad answer, check whether the right passage was ever retrieved. Recall at k tells you which half of the system to fix.

What this lesson covers

• Build a query set with known correct passages
• Measure recall and precision at k
• Separate retrieval failures from generation failures

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.