# Spectral graph theory

## Linear signals on graphs

Placeholder for the application of classic linear systems theory applied to networks in the form of spectral graph theory, which I split off from the networks notebook, since that started to feel like algebraic graph methods, mostly. As used in graph nueral networks.

I am interested in how filters can be defined on graphs; apparently they can?

Defferrard, Bresson, and Vandergheynst (2016) is credited with introducing localized Cheybshev filtering defined in terms of graph Laplacian to the neural nets. David I. Shuman, Vandergheynst, and Frossard (2011) seems to introduce this in a signal processing setting. (see overview in D. I. Shuman et al. (2013)). Isufi et al. (2017) defines an analogue of standard linear filters. There is a helpful visual comparison of both methods in Andreas Loukas’ blog post.

Many overlaps, different phrasing: matrix factorisation.

## Tooling

Laplacians.jl (Julia):

Laplacians is a package containing graph algorithms, with an emphasis on tasks related to spectral and algebraic graph theory. It contains (and will contain more) code for solving systems of linear equations in graph Laplacians, low stretch spanning trees, sparsifiation, clustering, local clustering, and optimization on graphs.

All graphs are represented by sparse adjacency matrices. This is both for speed, and because our main concerns are algebraic tasks. It does not handle dynamic graphs. It would be very slow to implement dynamic graphs this way.

Much more tooling under graph neural networks.

## References

Belkin, Mikhail, and Partha Niyogi. 2003. Neural Computation 15 (6): 1373–96.
Butler, Steve, and Fan Chung. 2013. In Handbook of Linear Algebra, 13.
Chung, Fan R. K., and Fan Chung Graham. 1997. Spectral Graph Theory. American Mathematical Soc.
Defferrard, Michaël, Xavier Bresson, and Pierre Vandergheynst. 2016. In Advances In Neural Information Processing Systems.
Diaconis, Persi, and Daniel Stroock. 1991. The Annals of Applied Probability 1 (1): 36–61.
Ding, C., X. He, and H. Simon. 2005. In Proceedings of the 2005 SIAM International Conference on Data Mining, 606–10. Proceedings. Society for Industrial and Applied Mathematics.
Hogben, Leslie, ed. 2014. Handbook of Linear Algebra. Second edition. Discrete Mathematics and Its Applications. Boca Raton, Florida: CRC Press/Taylor & Francis Group.
Isufi, Elvin, Andreas Loukas, Andrea Simonetto, and Geert Leus. 2017. IEEE Transactions on Signal Processing 65 (2): 274–88.
Kipf, Thomas N., and Max Welling. 2016. In arXiv:1609.02907 [Cs, Stat].
Luxburg, Ulrike von. 2007. “A Tutorial on Spectral Clustering.”
Mahoney, Michael W. 2016. arXiv Preprint arXiv:1608.04845.
Newman, M. E. J. 2006. Proceedings of the National Academy of Sciences 103 (23): 8577–82.
Shuman, D. I., S. K. Narang, P. Frossard, A. Ortega, and P. Vandergheynst. 2013. IEEE Signal Processing Magazine 30 (3): 83–98.
Shuman, David I., Pierre Vandergheynst, and Pascal Frossard. 2011. 2011 International Conference on Distributed Computing in Sensor Systems and Workshops (DCOSS), June, 1–8.
Solé-Ribalta, A., M. De Domenico, N. E. Kouvaris, A. Díaz-Guilera, S. Gómez, and A. Arenas. 2013. Physical Review E 88 (3): 032807.
Spielman, Daniel A., and Shang-Hua Teng. 2008a. arXiv:0808.4134 [Cs], August.
———. 2008b. arXiv:0809.3232 [Cs], September.
Xia, Feng, Ke Sun, Shuo Yu, Abdul Aziz, Liangtian Wan, Shirui Pan, and Huan Liu. 2021. IEEE Transactions on Artificial Intelligence 2 (2): 109–27.

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