Search arXiv⌕ Search
Home/Archive/arXiv

arXiv · 2504.17733

Fuzzy clustering and community detection: an integrated approach

Domenico Cangemi·Pierpaolo D'Urso·Livia De Giovanni·Lorenzo Federico·Vincenzina Vitale
View original source ↗Read source document ↗Export metadata ↓

Abstract

This paper addresses the ambitious goal of merging two different approaches to group detection in complex domains: one based on fuzzy clustering and the other on community detection theory. To achieve this, two clustering algorithms are proposed: Fuzzy C-Medoids Clustering with Modularity Spatial Correction and Fuzzy C-Modes Clustering with Modularity Spatial Correction. The former is designed for quantitative data, while the latter is intended for qualitative data. The concept of fuzzy modularity is introduced into the standard objective function of fuzzy clustering algorithms as a spatial regularization term, whose contribution to the clustering criterion based on attributes is controlled by an exogenous parameter. An extensive simulation study is conducted to support the theoretical framework, complemented by two applications to real-world data related to the theme of sustainability. The first application involves data from the 2030 Agenda for Sustainable Development, while the second focuses on urban green spaces in Italian provincial capitals and metropolitan cities. Both the simulation results and the applications demonstrate the advantages of this new methodological proposal.

Explore related subjects

stat.CO

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Domenico Cangemi, Pierpaolo D'Urso, Livia De Giovanni, Lorenzo Federico, Vincenzina Vitale. 2025-04-24. Fuzzy clustering and community detection: an integrated approach. https://arxiv.org/abs/2504.17733

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Delayed Acceptance Slice Sampling

Slice sampling is a well-established Markov chain Monte Carlo method for approximate sampling of target distributions which are only known up to a normalizing constant. The method is based on choosing a new state on a slice, i.e., a superlevel set of the given unnormalized target density (with respect to a reference measure). However, slice sampling algorithms usually require per step multiple evaluations of the target density, and thus can become computationally expensive. This is particularly the case for Bayesian inference with costly likelihoods. In this paper, we exploit deterministic approximations of the target density, which are relatively cheap to evaluate, and propose delayed acceptance versions of several common (hybrid) slice samplers. We show ergodicity of the resulting slice sampling methods, discuss the superiority of delayed acceptance (ideal) slice sampling over delayed acceptance Metropolis-Hastings algorithms, and illustrate the benefits of our novel approach in terms of improved computational efficiency in numerical experiments.

stat.CO↗
arXiv2026

Repulsive normalizing flow mixtures for adaptive importance sampling: reliability analysis of complex systems

Accurate rare-event estimation can be computationally expensive. Classical adaptive importance sampling (IS) schemes often rely on restrictive proposal families and can struggle under multiple failure modes. We propose FAMIS, a flow-based multiple importance sampling (MIS) framework that learns a nonuniform mixture of normalizing flow proposals for rare event estimation. The method does not require presampled failure data or prior knowledge of the number, location, or geometry of the failure modes. Instead, it adaptively learns the mixture through sequential evaluations of the limit state function. To guide training toward the failure domain, FAMIS uses a smooth rare-event surrogate and a tempered target sequence. A defensive exploration mixture improves early-stage coverage, a Rao Blackwellized update adapts the mixture weights, and a Jensen-Shannon repulsion term promotes separation and diversity among the base components. The final failure probability is computed with a deterministic-mixture MIS estimator. Numerical experiments demonstrate that FAMIS accurately approximates quasi-optimal IS densities with fewer training samples and model evaluations, providing stable variance reduction across complex reliability problems.

stat.CO↗
arXiv2026

Scentree: a framework for generating scenario trees for multistage stochastic programming

We present scentree, an open-source Python package for constructing a scenario fan and a scenario tree for multistage stochastic programming from historical data. It combines machine learning and multivariate time series models to obtain a scenario fan that captures inter-stage dependencies in the stochastic processes. This scenario fan is subsequently transformed into a scenario tree suitable for multistage stochastic optimization, providing a flexible and extensible framework for uncertainty modeling. A key contribution is the automation of the complete workflow, including model selection, parameter estimation, scenario fan generation, and scenario tree construction. Scentree does not rely on assumptions about the underlying data distribution, reducing the statistical expertise required to produce a scenario tree. Furthermore, it is agnostic to the specific multistage stochastic problem to be solved.

stat.CO↗