Improved spectral convergence rates for graph Laplacians on ε-graphs and k-NN graphs

• Published in: Applied and computational harmonic analysis Vol. 60; pp. 123 - 175
• Main Authors: Calder, Jeff, García Trillos, Nicolás
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.09.2022
• Subjects: Discrete to continuum; Graph Laplacian; Laplace-Beltrami operator; Rates of convergence; Spectral convergence; Discrete to continuum; Graph Laplacian; Spectral convergence; Rates of convergence; Laplace-Beltrami operator
• ISSN: 1063-5203; 1096-603X
• DOI: 10.1016/j.acha.2022.02.004

In this paper we improve the spectral convergence rates for graph-based approximations of weighted Laplace-Beltrami operators constructed from random data. We utilize regularity of the continuum eigenfunctions and strong pointwise consistency results to prove that spectral convergence rates are the same as the pointwise consistency rates for graph Laplacians. In particular, for an optimal choice of the graph connectivity ε, our results show that the eigenvalues and eigenvectors of the graph Laplacian converge to those of a weighted Laplace-Beltrami operator at a rate of O(n−1/(m+4)), up to log factors, where m is the manifold dimension and n is the number of vertices in the graph. Our approach is general and allows us to analyze a large variety of graph constructions that include ε-graphs and k-NN graphs. We also present the results of numerical experiments analyzing convergence rates on the two dimensional sphere.