Richard Khoury

Affiliate Member

Associate Professor, Université Laval, Department of Computer science and software engineering

Research Topics

Data Analysis

Generative Models

Natural Language Processing

Website

Google Scholar

Publications

Causal Parametric Drift Simulation: A Digital Twin Framework for Classifier Robustness Evaluation

Julien Lafrance

Richard Khoury

Véronique Tremblay

Machine learning classifiers in dynamic environments face concept drift -- changes in the data-generating process that degrade performance. … (see more)Conventional evaluation via static test sets or noise perturbations fails to preserve causal dependencies in tabular data, often producing causally invalid assessments. Post-hoc tools like SHAP and LIME offer correlational insights that may not reflect the causal mechanisms driving model failure. We propose a framework that complements existing drift detection by leveraging Structural Causal Models as "Digital Twins" of data-generating processes, enabling precise causal interventions while preserving structural dependencies. Our technique, Causal Parametric Drift Simulation, stress-tests classifiers to identify vulnerabilities before deployment. Experiments on the Open Sourcing Mental Illness (OSMH) dataset demonstrate that this approach exposes latent vulnerabilities invisible to standard statistical monitors.

2026-05-09

arXiv (preprint)

doi.org

arxiv.org

Neural Bandits for Data Mining: Searching for Dangerous Polypharmacy

Alexandre Larouche

Audrey Durand

Richard Khoury

Caroline Sirois

2022-12-09

ArXiv (preprint)

doi.org