FEAMOE: Fair, Explainable and Adaptive Mixture of Experts

FEAMOE: Fair, Explainable and Adaptive Mixture of Experts

Shubham Sharma, Jette Henderson, Joydeep Ghosh

Proceedings of the Thirty-Second International Joint Conference on Artificial Intelligence
Main Track. Pages 492-500. https://doi.org/10.24963/ijcai.2023/55

Three key properties that are desired of trustworthy machine learning models deployed in high-stakes environments are fairness, explainability, and an ability to account for various kinds of "drift". While drifts in model accuracy have been widely investigated, drifts in fairness metrics over time remain largely unexplored. In this paper, we propose FEAMOE, a novel "mixture-of-experts" inspired framework aimed at learning fairer, more interpretable models that can also rapidly adjust to drifts in both the accuracy and the fairness of a classifier. We illustrate our framework for three popular fairness measures and demonstrate how drift can be handled with respect to these fairness constraints. Experiments on multiple datasets show that our framework as applied to a mixture of linear experts is able to perform comparably to neural networks in terms of accuracy while producing fairer models. We then use the large-scale HMDA dataset and show that various models trained on HMDA demonstrate drift and FEAMOE can ably handle these drifts with respect to all the considered fairness measures and maintain model accuracy. We also prove that the proposed framework allows for producing fast Shapley value explanations, which makes computationally efficient feature attribution based explanations of model decisions readily available via FEAMOE.
Keywords:
AI Ethics, Trust, Fairness: ETF: Ethical, legal and societal issues
AI Ethics, Trust, Fairness: ETF: Bias
AI Ethics, Trust, Fairness: ETF: Other