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Ryan 2025-01-08 16:28:27 +08:00
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4-data-analytics.md
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@ -343,7 +343,7 @@
- Create new features from existing ones, thus increasing predictive power
- Takes the Cartesian product of existing features
- $A\times B=\{(a,b)\mid a\in A\ {\mbox{ and }}\ b\in B\}.$
- $A\times B=\{(a,b), a \in A and b\in B\}.$
- Has uses when data is not linerarly separable
- Deciding which feature to cross:
- Use expertise