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How does a decision tree carve up feature space?

Difficulty: Approachable
Estimated time: 5 min

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Step 1 of 4Make the first cut

Inspect how one x threshold creates two leaves and two broad prediction regions.

One rule can only divide the whole plane into two half-planes.

Decision tree with depth 1, 2 leaves, root threshold x less than 4.0, and 60 percent accuracy.

Decision tree with depth 1, 2 leaves, root threshold x less than 4.0, and 60 percent accuracy.

Tree depth

Root threshold x4.0