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Which Spatial Partition Trees are Adaptive to Intrinsic Dimension?
Proceedings of the 25th Conference on Uncertainty in Artificial Intelligence, PMLR R7:573-582, 2009.
Abstract
Recent theory work has found that a special type of spatial partition tree – called a ran- dom projection tree – is adaptive to the in- trinsic dimension of the data from which it is built. Here we examine this same ques- tion, with a combination of theory and ex- periments, for a broader class of trees that includes k-d trees, dyadic trees, and PCA trees. Our motivation is to get a feel for (i) the kind of intrinsic low dimensional struc- ture that can be empirically verified, (ii) the extent to which a spatial partition can ex- ploit such structure, and (iii) the implications for standard statistical tasks such as regres- sion, vector quantization, and nearest neigh- bor search.