Achieving Counterfactual Fairness for Anomaly Detection
This work addresses fairness issues in anomaly detection for applications involving humans, focusing on a causation-based notion rather than association-based ones, representing an incremental advancement.
The paper tackled the problem of ensuring counterfactual fairness in anomaly detection models, proposing a CFAD framework that effectively detects anomalies while maintaining fairness, as demonstrated on synthetic and real datasets.
Ensuring fairness in anomaly detection models has received much attention recently as many anomaly detection applications involve human beings. However, existing fair anomaly detection approaches mainly focus on association-based fairness notions. In this work, we target counterfactual fairness, which is a prevalent causation-based fairness notion. The goal of counterfactually fair anomaly detection is to ensure that the detection outcome of an individual in the factual world is the same as that in the counterfactual world where the individual had belonged to a different group. To this end, we propose a counterfactually fair anomaly detection (CFAD) framework which consists of two phases, counterfactual data generation and fair anomaly detection. Experimental results on a synthetic dataset and two real datasets show that CFAD can effectively detect anomalies as well as ensure counterfactual fairness.