03 · Practise and check
Try this yourself
Create a test query that has no useful answer in your collection. Define the empty-result message you want users to see.
Check your understanding
If eight of ten queries have a relevant document in the first three results, hit@3 is 0.8. This says nothing about the order within those three.
A mistake to avoid
Never let retrieval expose private lessons to users who lack access. A relevant result can still be unauthorised.
Before looking at the answer, write a short explanation and one example of your own. Finish by naming one limitation of the method. Use Mark as read when you are ready, or return to the previous lesson if a term is unclear.
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