Lesson 5 of 10 · Computer Vision for Builders, Not Researchers
In this lesson. Precision/recall or field accuracy, plus a slice on the tail.
What you will learn
- Held-out
- Tail slice
- Bar
Walkthrough
You will hold out images. Slice on lighting. If you cannot measure, you cannot ship. This is the bar.
Work through the ideas in order. After each point, pause and connect it to a task you already do — a document, a workflow, or a feature you own. The goal of Computer Vision for Builders, Not Researchers is usable skill, not a pile of notes.
If something is unclear, rewrite it in your own words before you continue. Teaching the step back to yourself is the fastest way to see gaps.
Practice
Write an eval plan with a tail slice.
Keep the first attempt small. A finished example you can reuse beats a perfect plan you never run.
Check your understanding
- Can you explain the goal of this lesson in one sentence to a teammate?
- Where would you apply “Held-out” in your own work this week?
- What would you change on a second pass of the practice?
Next. Continue to the following lesson when the practice has a real artifact, even a rough one.