KwickClips Artificial Intelligence · 39 sec · free
Where does a centroid move?
Short answer. To the mean of its points.
What are the two steps?
Assign to nearest centre, then move to the mean.
Marks 20 25 30 70 80 90, k = 2
| Round | Centroid 1 | Centroid 2 |
|---|---|---|
| Start | 25 | 30 |
| Round 1 | 22.5 | 67.5 |
| Round 2 | 25 | 80 |
| Round 3 | 25 | 80 |
Remember
| Assign to nearest centre |
| Move centre to the mean |
How does k-Means find a centre? Six marks, two groups. Start: twenty five and thirty. Round one, twenty two point five and sixty seven point five. Round two, twenty five and eighty. It settles. Assign, then move to the mean. Repeat.
This clip is from the full lesson: Clustering and the k-Means Algorithm — 7 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 11 Artificial Intelligence (843)
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