NearestNeighbor, distance and ball tree

User 2095 | 7/21/2015, 2:47:32 PM

Hi,

It seems that I cannot use ball tree to accelerate nearest neighbor lookup when I'm using a composite distance. So what is ball tree's requirement for a distance? How could I define the distance so that I could avoid linear lookup? Thanks for any suggestion~

Cheers, Crash

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