﻿PHASE 3 — EXCEL BRAIN (about 60 min)

Build a tiny AI in Excel: it learns to tell an APPLE from a BANANA from 5x5-pixel pictures.

1. Open Excel_Brain_Starter_EN.xlsx. Yellow = you type, blue = formula.
2. Sheet "Pictures": 12 training pictures (1 = Apple, 0 = Banana).
3. Sheet "Learn": type 5 formulas in row 8, then select F8:BJ199 and press Ctrl+D (see the guide for the formulas).
4. Sheet "Brain": watch the charts. Change the learning rate (0.05 / 0.5 / 5).
5. Sheet "Test": type the formulas, fill down, find your accuracy. GOAL: 90% or more.
6. Sheet "Draw": draw your own picture and ask the brain. It always answers, even for nonsense.
7. Add 4 training pictures of your OWN in slots 13-16 of "Pictures". Never copy the test pictures!

Open guide-en.html for pictures, the formulas to copy, and quick checks (the video is on the class server / online).
