Which spatial partition trees are adaptive to intrinsic dimension?

  • Authors:
  • Nakul Verma;Samory Kpotufe;Sanjoy Dasgupta

  • Affiliations:
  • UC San Diego;UC San Diego;UC San Diego

  • Venue:
  • UAI '09 Proceedings of the Twenty-Fifth Conference on Uncertainty in Artificial Intelligence
  • Year:
  • 2009

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Abstract

Recent theory work has found that a special type of spatial partition tree -- called a random projection tree -- is adaptive to the intrinsic dimension of the data from which it is built. Here we examine this same question, with a combination of theory and experiments, 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 structure that can be empirically verified, (ii) the extent to which a spatial partition can exploit such structure, and (iii) the implications for standard statistical tasks such as regression, vector quantization, and nearest neighbor search.