The University of Massachusetts Amherst
University of Massachusetts Amherst

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Irene Chen - Why is my classifier discriminatory?

Machine Learning and Friends Lunch
Thursday, February 21, 2019 - 12:00pm
Computer Science Building, Room 150/151


Abstract: Recent attempts to achieve fairness in predictive models focus on the balance between fairness and accuracy. In sensitive applications such as healthcare or criminal justice, this trade-off is often undesirable as any increase in prediction error could have devastating consequences. In this work, we argue that the fairness of predictions should be evaluated in context of the data, and that unfairness induced by inadequate samples sizes or unmeasured predictive variables should be addressed through data collection, rather than by constraining the model. We decompose cost-based metrics of discrimination into bias, variance, and noise, and propose actions aimed at estimating and reducing each term. Finally, we perform case-studies on prediction of income, mortality, and review ratings, confirming the value of this analysis. We find that data collection is often a means to reduce discrimination without sacrificing accuracy.


Bio: Irene Chen is a PhD student at MIT in Electrical Engineering and Computer Science in the Clinical Machine Learning Group. Her research focuses on building machine learning methods that to advance knowledge in health care and fairness. Before MIT, she received her AB/SM from Harvard in Applied Math and Computational Engineering and worked at Dropbox for two years as a Data Scientist, Machine Learning Engineer, and Chief of Staff.