Joe Sack explains four important measures:
You type “3-bedroom townhouse near a good school” into a home search site. It shows 10 homes. Some perfect, some okay, some wrong. How do you know if it’s working?
Four numbers help with this: Precision (what proportion is relevant), Recall (what you missed), MRR (how far to the first relevant result), nDCG (best stuff first).
Read on to learn what each one means and how it applies to vector search.