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A Priori - Nearest Neighbor Methods
If the data happens to be so structured, then we do automatically better without knowing that. The two nearest or three or four dos become parmeters of the problem. In classification, it's a bit more ocomplicated. Cross valudation get you half the way for hard classification problems. To get the best possible result, you might need more refined, quoting, quota adaptive procedures to choose. And they are various ideas out there, and those are the various things i'm interested in.