Consistency of spectral clustering in stochastic block models
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Abstract (arXiv)
We analyze the performance of spectral clustering for community extraction in stochastic block models. We show that, under mild conditions, spectral clustering applied to the adjacency matrix of the network can consistently recover hidden communities even when the order of the maximum expected degree is as small as log n, with n the number of nodes. This result applies to some popular polynomial time spectral clustering algorithms and is further extended to degree corrected stochastic block models using a spherical k-median spectral clustering method. A key component of our analysis is a combinatorial bound on the spectrum of binary random matrices, which is sharper than the conventional matrix Bernstein inequality and may be of independent interest.
Key facts. Cited by 129 papers in the map (data through 14 Oct 2026). First posted on arXiv 7 Dec 2013.
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Citing papers per year: 2021: 35; 2022: 30; 2023: 21; 2024: 14; 2025: 14; 2026: 15.
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