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Normed distances link
p_root(sum(xi-yi)^p)
. "p" = ? (1, 2, ..) for below.abs(x2-x1)+abs(y2-y1)
. Grid-like distance (triangle legs). Preferred for high-dim space.sqrt((x2-x1)^2+(y2-y1)^2
. sqrt(dot-product)
. Straight-line distance; min distance (Pythagorean triangle edge)Dot product
Cosine (normalized dot)