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arXiv · 2503.11820

An Algebraic Approach to Moralisation and Triangulation of Probabilistic Graphical Models

Antonio Lorenzin·Fabio Zanasi
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Abstract

Moralisation and Triangulation are transformations allowing to switch between different ways of factoring a probability distribution into a graphical model. Moralisation allows to view a Bayesian network (a directed model) as a Markov network (an undirected model), whereas triangulation works in the opposite direction. We present a categorical framework where these transformations are modelled as functors between a category of Bayesian networks and one of Markov networks. The two kinds of network (the objects of these categories) are themselves represented as functors, from a `syntax' domain to a `semantics' codomain. Notably, moralisation and triangulation are definable inductively on such syntax, and operate as a form of functor pre-composition. This approach introduces a modular, algebraic perspective in the theory of probabilistic graphical models.

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Antonio Lorenzin, Fabio Zanasi. 2025-03-14. An Algebraic Approach to Moralisation and Triangulation of Probabilistic Graphical Models. https://doi.org/10.4230/lipics.calco.2025.6

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