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arXiv · 2010.08402

Difference-in-Differences: Bridging Normalization and Disentanglement in PG-GAN

Xiao Liu·Jiajie Zhang·Siting Li·Zuotong Wu·Yang Yu
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Abstract

What mechanisms causes GAN's entanglement? Although developing disentangled GAN has attracted sufficient attention, it is unclear how entanglement is originated by GAN transformation. We in this research propose a difference-in-difference (DID) counterfactual framework to design experiments for analyzing the entanglement mechanism in on of the Progressive-growing GAN (PG-GAN). Our experiment clarify the mechanisms how pixel normalization causes PG-GAN entanglement during a input-unit-ablation transformation. We discover that pixel normalization causes object entanglement by in-painting the area occupied by ablated objects. We also discover the unit-object relation determines whether and how pixel normalization causes objects entanglement. Our DID framework theoretically guarantees that the mechanisms that we discover is solid, explainable and comprehensively.

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Xiao Liu, Jiajie Zhang, Siting Li, Zuotong Wu, Yang Yu. 2020-10-16. Difference-in-Differences: Bridging Normalization and Disentanglement in PG-GAN. https://arxiv.org/abs/2010.08402

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