Papers › Emerging Convolutions for Generative Normalizing Flows

Emerging Convolutions for Generative Normalizing Flows

30 Jan 2019arXiv:1901.11137archive 2025-07-28

Emiel Hoogeboom, Rianne van den Berg, Max Welling

Generative flows are attractive because they admit exact likelihood optimization and efficient image synthesis. Recently, Kingma & Dhariwal (2018) demonstrated with Glow that generative flows are capable of generating high quality images. We generalize the 1 x 1 convolutions proposed in Glow to invertible d x d convolutions, which are more flexible since they operate on both channel and spatial axes. We propose two methods to produce invertible convolutions that have receptive fields identical to standard convolutions: Emerging convolutions are obtained by chaining specific autoregressive convolutions, and periodic convolutions are decoupled in the frequency domain. Our experiments show that the flexibility of d x d convolutions significantly improves the performance of generative flow models on galaxy images, CIFAR10 and ImageNet.

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Image Generation

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1x1 ConvolutionActivation NormalizationAffine CouplingGLOWInvertible 1x1 ConvolutionNormalizing Flows

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