Data Redaction from Pre-trained GANs

Zhifeng Kong, Kamalika Chaudhuri

Keywords: data redaction, GAN, post-editing, validity

TL;DR: The paper presents algorithms to post-edit pre-trained GANs to redact training samples.

Abstract: Large pre-trained generative models are known to occasionally output undesirable samples, which undermines their trustworthiness. The common way to mitigate this is to re-train them differently from scratch using different data or different regularization -- which uses a lot of computational resources and does not always fully address the problem. In this work, we take a different, more compute-friendly approach and investigate how to post-edit a model after training so that it ``redacts'', or refrains from outputting certain kinds of samples. We show that redaction is different from data deletion, and data deletion may not always lead to redaction. We then consider Generative Adversarial Networks (GANs), and provide three different algorithms for data redaction that differ on how the samples to be forgotten are described. Extensive evaluations on real-world image datasets show that our algorithms out-perform data deletion baselines, and are capable of redacting data while retaining high generation quality at a fraction of the cost of full re-training.