A survey of algorithmic recourse: definitions, formulations, solutions, and prospects
This work addresses the need for recourse in sensitive decision-making contexts, but it is incremental as it synthesizes existing literature rather than introducing new methods.
The paper tackles the problem of providing explanations and recommendations to individuals unfavorably treated by automated decision-making systems by presenting a unified survey of algorithmic recourse, including definitions, formulations, and solutions, and outlines future research directions.
Machine learning is increasingly used to inform decision-making in sensitive situations where decisions have consequential effects on individuals' lives. In these settings, in addition to requiring models to be accurate and robust, socially relevant values such as fairness, privacy, accountability, and explainability play an important role for the adoption and impact of said technologies. In this work, we focus on algorithmic recourse, which is concerned with providing explanations and recommendations to individuals who are unfavourably treated by automated decision-making systems. We first perform an extensive literature review, and align the efforts of many authors by presenting unified definitions, formulations, and solutions to recourse. Then, we provide an overview of the prospective research directions towards which the community may engage, challenging existing assumptions and making explicit connections to other ethical challenges such as security, privacy, and fairness.