Lesson 3 of 8
Groups with no prices
Show on a big screenRemove the prices from ten crates. Can a program still put them in groups?
A cross marks the middle of a group. One round puts every crate into the nearer group.
Step 1 of 5
- Ten crates with no prices. Only their places are known.
- Start from the two crates furthest apart. Each gets a cross.
- Each crate joins the nearer cross.
- Move each cross to the middle of its group. One crate switches.
- Repeat. In round 3 nobody moves. The groups are 5 and 5.
The rule
With no prices, closeness can still make groups. Repeat until nobody changes group.
A group's middle is the mean of its spots and days. Mean spots: add all spots, then divide by the crate count. Do the same for days. Learning with no answers given is unsupervised learning.
Now put the prices back. Group A has 3 full price and 2 cut price crates. Group B has 3 cut price and 2 full price. The groups are not the prices. The program never saw a price when it made the groups.
Tap Next round until the groups stop moving.
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Try the lab to finish this lesson.