KwickClips Artificial Intelligence · 41 sec · free
Is k = 1 risky?
Short answer. Yes. One odd neighbour can fool it.
How do you pick k?
Test several values and keep the most accurate.
Choosing k
| Too small: fooled by one point |
| Too large: far points vote |
| Odd k avoids ties |
Remember
| Test several k values |
| Keep the most accurate |
One odd neighbour can fool your model. So which k is best? Choose k with care. Too small, and one odd point fools it. Too large, and far points vote. An odd k avoids ties. Test several k values. Keep the most accurate.
This clip is from the full lesson: Classification and the k-Nearest Neighbours Algorithm — 7 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 10 Artificial Intelligence (417), CBSE Class 10 Artificial Intelligence (417), CBSE Class 11 Artificial Intelligence (843), CBSE Class 11 Artificial Intelligence (843)
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