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I need to calculate ~1 billion distances between points with ~100 dimensions each. I think calculating these distances (or even distance squared) would be very expensive. How can I approximate the distance using a faster algorithm?

The algorithms I've found online mostly only work in two dimensions.

Thanks!

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    @JohnBentin: I'm trying to run k-means clustering on a set of 100 million points, where k = 5.2012-11-25

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