Author

A. O'Hare

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#machine learning Preprint Sep 2026

Posterior Regimes and Latent Deception: Variational Bayesian Inference in Hidden Markov Models for Sequential Fraud Detection in Financial Transactions

We present a three-tier progression of Hidden Markov Models: maximum-likelihood (Baum-Welch), variational Bayesian (VBEM), and a neural variational extension (Neural VBEM), that model each customer's transaction history as a trajectory through a small number of latent behavioural regimes, one of which is empirically id...

Joseph Uririoghene Obukofe, A. O'Hare, Chioma Sandra Dike · 0 citations

Jul 2026

Rumour Spreading In Community Based Networks

This paper investigates a particular spreading process, the spread of a rumour, on a community based network that is characterised by two parameters; the within-group connectivity, and the between-group connectivity and shows that such networks have different characteristics to small-world or random networks that are o...

Z. Cui, Anthony O’Hare · arXiv.org · 0 citations