A Multigrid Solver for Graph Laplacian Linear Systems on Power-Law Graphs

Date
2016-05-17
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Abstract

The Laplacian matrix, L, of a graph, G, contains degree and edge information of a given network. Solving a Laplacian linear system Lx = b provides information about flow through the network, and in specific cases, how that information orders the nodes in the network. I propose a novel way to solve this linear system by first partitioning G into its maximum locally-connected subgraph and a small subgraph of the remaining so-called "teleportation" edges. I then apply optimal multigrid solves to the locally-connected subgraph, and linear algebra and a solve on the teleportation subgraph to solve the original linear system. I show results for this method on real-world graphs from the biological systems of the C. Elegans worm, Facebook friend networks, and the power grid of the Western United States.

Description
Degree
Master of Arts
Type
Thesis
Keywords
Laplacian, Multigrid
Citation

Buras, Eric. "A Multigrid Solver for Graph Laplacian Linear Systems on Power-Law Graphs." (2016) Master’s Thesis, Rice University. https://hdl.handle.net/1911/96624.

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