> Are the [features] described with high-dimensional spaces really all 90° geometrically orthogonal?
If the features are not statistically independent, I don't think it's likely that they're truly orthogonal; which might not affect the utility of a distance metric that assumes that they are all orthogonal.
If the features are not statistically independent, I don't think it's likely that they're truly orthogonal; which might not affect the utility of a distance metric that assumes that they are all orthogonal.