4.4 Article

Fair machine learning through constrained stochastic optimization and an e-constraint method

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SPRINGER HEIDELBERG
DOI: 10.1007/s11590-023-02024-6

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Stochastic multiobjective optimization; Fair machine learning

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A strategy for fair supervised learning is proposed, which involves minimizing loss while satisfying a constraint on a measure of unfairness. This strategy can be incorporated into a multi-objective optimization method to generate a Pareto front for minimizing loss and unfairness. A scalable stochastic optimization algorithm is proposed for solving the resulting constrained optimization problems in large data settings. Numerical experiments on recidivism and income prediction problems demonstrate the effectiveness of this strategy in large-scale fair learning.
A strategy for fair supervised learning is proposed. It involves formulating an optimization problem to minimize loss subject to a prescribed bound on a measure of unfairness (e.g., disparate impact). It can be embedded within an e-constraint method for multiobjective optimization, allowing one to produce a Pareto front for minimizing loss and unfairness. A stochastic optimization algorithm, designed to be scalable for large data settings, is proposed for solving the arising constrained optimization problems. Numerical experiments on problems pertaining to predicting recidivism and income provide evidence that the strategy can be effective for largescale fair learning.

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