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Ewen Gallic

2 accepted papers

2025

Optimal Transport on Categorical Data for Conterfactuals Using Compositional Data and Dirichlet Transport

IJCAI 2025

Recently, optimal transport-based approaches have gained attention for deriving counterfactuals, e.g., to quantify algorithmic discrimination. However, in the general multivariate setting, these methods are often opaque and difficult to interpret. To address this, alternative methodologies have been

2025

Sequential Conditional Transport on Probabilistic Graphs for Interpretable Counterfactual Fairness

AAAI 2025technical

In this paper, we link two existing approaches to derive counterfactuals: adaptations based on a causal graph, and optimal transport. We extend "Knothe's rearrangement" and "triangular transport" to probabilistic graphical models, and use this counterfactual approach, referred to as sequential tran…