From graphs to manifolds – weak and strong pointwise consistency of graph laplacians

  • Authors:
  • Matthias Hein;Jean-Yves Audibert;Ulrike von Luxburg

  • Affiliations:
  • Max Planck Institute for Biological Cybernetics, Tübingen, Germany;CERTIS, ENPC, Paris, France;Fraunhofer IPSI, Darmstadt, Germany

  • Venue:
  • COLT'05 Proceedings of the 18th annual conference on Learning Theory
  • Year:
  • 2005

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Abstract

In the machine learning community it is generally believed that graph Laplacians corresponding to a finite sample of data points converge to a continuous Laplace operator if the sample size increases. Even though this assertion serves as a justification for many Laplacian-based algorithms, so far only some aspects of this claim have been rigorously proved. In this paper we close this gap by establishing the strong pointwise consistency of a family of graph Laplacians with data- dependent weights to some weighted Laplace operator. Our investigation also includes the important case where the data lies on a submanifold of ${\mathbb R}^{d}$.