Generator Knows What Discriminator Should Learn in Unconditional GANs (ECCV 2022)
Gayoung Lee¹, Hyunsu Kim¹, Junho Kim¹, Seonghyeon Kim², Jung-Woo Ha¹, Yunjey Choi¹

¹NAVER AI Lab, ²NAVER CLOVA

Abstract Recent conditional image generation methods benefit from dense supervision such as segmentation label maps to achieve high-fidelity. However, it is rarely explored to employ dense supervision for unconditional image generation. Here we explore the efficacy of dense supervision in unconditional generation and find generator feature maps can be an alternative of cost-expensive semantic label maps. From our empirical evidences, we propose a new generator-guided discriminator regularization (GGDR) in which the generator feature maps supervise the discriminator to have rich semantic representations in unconditional generation. In specific, we employ an encoder-decoder architecture for discriminator, which is trained to reconstruct the generator feature maps given fake images as inputs. Extensive experiments on mulitple datasets show that our GGDR consistently improves the performance of baseline methods in terms of quantitative and qualitative aspects. Code will be publicly available for the research community.

We attach GGDR to StyleGAN2-ADA-pytorch, so heavily brought their codes.

Usage of this repository is almost same with StyleGAN2-ADA-pytorch except GGDR option. See their repository for more detailed instructions.

> python train.py --outdir=training-runs  --reg_type=ggdr --ggdr_res=64 --gpus=8 --cfg=paper256 --data=./datasets/ffhq256.zip

Belows are some additional arguments can be customized.

• --reg_type=ggdr Enable GGDR (default: disabled)
• --ggdr_res=64 Set target feature map by given resolution for GGDR (default: 64). If you use smaller images(e.g. cifar10), it is recommended to set this $(resolution) / 4 (e.g. 8 for cifar10).
• --aug=noaug Disables ADA (default: enabled)
• --mirror=1 Enables x-flips (default: disabled)

> python generate.py --outdir=out --seeds=100-200 --network=PATH_TO_MODEL

Licensed under NVIDIA Source Code License for StyleGAN2 with Adaptive Discriminator Augmentation (ADA).

@inproceedings{lee2022ggdr,
  title={Generator Knows What Discriminator Should Learn in Unconditional GANs},
  author={Lee, Gayoung and Kim, Hyunsu and Kim, Junho and Kim, Seonghyeon and Ha, Jung-Woo and Choi, Yunjey},
  booktitle={ECCV},
  year={2022}
}