  Due to the difficulty in scaling up, generative adversarial networks (GANs)
seem to be falling from grace on the task of text-conditioned image synthesis.
Sparsely-activated mixture-of-experts (MoE) has recently been demonstrated as a
valid solution to training large-scale models with limited computational
resources. Inspired by such a philosophy, we present Aurora, a GAN-based
text-to-image generator that employs a collection of experts to learn feature
processing, together with a sparse router to help select the most suitable
expert for each feature point. To faithfully decode the sampling stochasticity
and the text condition to the final synthesis, our router adaptively makes its
decision by taking into account the text-integrated global latent code. At
64x64 image resolution, our model trained on LAION2B-en and COYO-700M achieves
6.2 zero-shot FID on MS COCO. We release the code and checkpoints to facilitate
the community for further development.
