Named group, number or found groups?
Show on a big screenOne program names leaves. One guesses how much rain. One groups shells. Which is which?
- Labelled leaves go in. A named group comes out.
- Past rainfall goes in. A number comes out.
- Unmarked shells go in. Groups it found come out.
- What comes out names the job.
Naming leaves is classification; guessing rain is regression; grouping shells is clustering.
Classification sorts things into named groups. It learns from labelled examples. A labelled example comes with its answer already on it. Regression guesses a number. Clustering finds groups with no labels. Unmarked shells have no labels.
| Kind | Learns from | What comes out |
|---|---|---|
| Classification | Labelled examples | A named group |
| Regression | Past examples with the answer known | A number, like a price |
| Clustering | Nothing labelled | Groups it found |
Ask what comes out. A named group is classification. A number to guess, like a price, is regression. Groups found with no labels are clustering.
Watch out!
A yes or no answer is a named group, not a number. Two groups is still classification. Digits can still be names, like a class number.
Read each job. Pick the kind of guess.
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Try the lab to finish this lesson.