03 · Practise and check
Try this yourself
Compare "the course is free" and "the course is not free". Explain why similar wording may create a dangerous retrieval match.
Check your understanding
A high similarity score can reflect shared topic while missing a critical difference such as negation. Read the retrieved passage before answering.
A mistake to avoid
Do not mix document vectors from one model with query vectors from another, even if their dimensions happen to match.
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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