Post-processing for Individual FairnessDownload PDF

21 May 2021, 20:47 (edited 26 Oct 2021)NeurIPS 2021 PosterReaders: Everyone
  • Keywords: algorithmic fairness, graph Laplacian, post-processing, fairness, individual fairness
  • TL;DR: Post-processing algorithms for achieving individual fairness.
  • Abstract: Post-processing in algorithmic fairness is a versatile approach for correcting bias in ML systems that are already used in production. The main appeal of post-processing is that it avoids expensive retraining. In this work, we propose general post-processing algorithms for individual fairness (IF). We consider a setting where the learner only has access to the predictions of the original model and a similarity graph between individuals, guiding the desired fairness constraints. We cast the IF post-processing problem as a graph smoothing problem corresponding to graph Laplacian regularization that preserves the desired "treat similar individuals similarly" interpretation. Our theoretical results demonstrate the connection of the new objective function to a local relaxation of the original individual fairness. Empirically, our post-processing algorithms correct individual biases in large-scale NLP models such as BERT, while preserving accuracy.
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