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Variational inference for estimating dynamic stochastic block models through an evolutionary algorithm

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  • Luca Brusa

    (University of Milano-Bicocca)

  • Fulvia Pennoni

    (University of Milano-Bicocca)

Abstract

Dynamic temporal networks are important structures to capture node dependencies and their evolution over time. The dynamic stochastic block model, commonly used with longitudinal network data, is estimated maximizing the likelihood function through the variational expectation-maximization (VEM) algorithm. However, maximization is challenging due to the presence of multiple local maxima. In this paper, we first conduct a simulation study to assess the performance of six different parameter initialization strategies. Second, we introduce a novel specification of the VEM through a genetic algorithm, enabling a more comprehensive exploration of the parameter space. Results from both simulations and historical data on infectious disease transmission highlight the advantages of this approach in overcoming convergence to local maxima and improving node clustering in temporal network data.

Suggested Citation

  • Luca Brusa & Fulvia Pennoni, 2025. "Variational inference for estimating dynamic stochastic block models through an evolutionary algorithm," Advances in Data Analysis and Classification, Springer;German Classification Society - Gesellschaft für Klassifikation (GfKl);Japanese Classification Society (JCS);Classification and Data Analysis Group of the Italian Statistical Society (CLADAG);International Federation of Classification Societies (IFCS), vol. 19(2), pages 469-492, June.
    • Handle: RePEc:spr:advdac:v:19:y:2025:i:2:d:10.1007_s11634-025-00634-9
    DOI: 10.1007/s11634-025-00634-9
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