Understanding Instance-based Interpretability of Variational Auto-Encoders

Part of Advances in Neural Information Processing Systems 34 pre-proceedings (NeurIPS 2021)

Paper

Bibtek download is not available in the pre-proceeding


Authors

Zhifeng Kong, Kamalika Chaudhuri

Abstract

Instance-based interpretation methods have been widely studied for supervised learning methods as they help explain how black box neural networks predict. However, instance-based interpretations remain ill-understood in the context of unsupervised learning. In this paper, we investigate influence functions [20], a popular instance-based interpretation method, for a class of deep generative models called variational auto-encoders (VAE). We formally frame the counter-factual question answered by influence functions in this setting, and through theoretical analysis, examine what they reveal about the impact of training samples on classical unsupervised learning methods. We then introduce VAE-TracIn, a computationally efficient and theoretically sound solution based on Pruthi et al. [28], for VAEs. Finally, we evaluate VAE-TracIn on several real world datasets with extensive quantitative and qualitative analysis.