Individual Fairness in Hindsight
summary
Defines individual fairness in hindsight as a Lipschitz-style rule that only imposes past-based lower bounds on current decisions so decisions can monotonically become more conducive but not worse, illustrated with a loan model (blue 1/4, green 3/4, allowed difference 0.5) where optimal steady policy is (0,0.5). Proposes CAFÉ (cautious fair exploration): start with epsilon loans, learn which type defaults, then increase loans monotonically. Gives regret rates (order log T when KL rates are favorable) and discusses legal and pricing analogies.
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chapters (11)
- 0:00Intro
- 0:42Definitions of Fairness
- 1:11Similarity = Lipschitzness
- 3:30Fairness-across-time
- 5:12Individual Fairness and Learning
- 6:31Individual Fairness in Hindsight
- 13:12Outline of the talk
- 14:50Utility Maximization: Dynamic
- 16:32Learnability of Utility
- 17:10Cautious Fair Exploration (CaFE)
- 25:13A fundamental tradeoff
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