NR-GAN: Noise Robust Generative Adversarial Networks (CVPR 2020)

This repository provides PyTorch implementation for noise robust GAN (NR-GAN). NR-GAN is unique in that it can learn a clean image generator even when only noisy images are available for training.

Note: In our previous studies, we have also proposed GANs for label noise. Please check them from the links below.

• Label-noise robust GAN (rGAN) (CVPR 2019)
• Classifier's posterior GAN (CP-GAN) (BMVC 2019)

Paper

Noise Robust Generative Adversarial Networks. Takuhiro Kaneko and Tatsuya Harada. In CVPR, 2020.

[Paper] [Project] [Slides] [Video]

Installation

Clone this repo:

git clone https://github.com/takuhirok/NR-GAN.git
cd NR-GAN/

First, install Python 3+. Then install PyTorch 1.3 and other dependencies by the following:

pip install -r requirements.txt

Training

To train a model, use the following script:

bash ./scripts/train.sh [dataset] [model] [output_directory_path]

Example

To train SI-NR-GAN-I (sinrgan1) on CIFAR-10 with additive Gaussian noise with a fixed standard deviation (cifar10ag25), run the following:

bash ./scripts/train.sh cifar10ag25 sinrgan1 outputs

The results are saved into outputs.

Note: In our experiments, we report the best model encountered during training to mitigate the performance fluctuation caused by GAN training instability.

Options

Regarding [dataset], choose one option among the following:

• cifar10: No noise
• cifar10ag25: (A) Additive Gaussian noise with a fixed standard deviation
• cifar10ag5-50: (B) Additive Gaussian noise with a variable standard deviation
• cifar10lg25p16: (C) Local Gaussian noise with a fixed-size patch
• cifar10lg25p8-24: (D) Local Gaussian noise with a variable-size patch
• cifar10u50: (E) Uniform noise
• cifar10mix: (F) Mixture noise
• cifar10bg25k5: (G) Brown Gaussian noise
• cifar10abg25k5: (H) Sum of (A) and (G)
• cifar10mg25: (I) Multiplicative Gaussian noise with a fixed standard deviation
• cifar10mg5-50: (J) Multiplicative Gaussian noise with a variable standard deviation
• cifar10amg5_25: (K) Sum of few (A) and (I)
• cifar10amg25_25: (L) Sum of much (A) and (I)
• cifar10p30: (M) Poisson noise with a fixed total number of events
• cifar10p10-50: (N) Poisson noise with a variable total number of events
• cifar10pg30_5: (O) Sum of (M) and few (A)
• cifar10pg30_25: (P) Sum of (M) and much (A)

Regarding [model], choose one option among the following:

• gan: GAN
• ambientgan: AmbientGAN
• sinrgan1: SI-NR-GAN-I
• sinrgan2: SI-NR-GAN-II
• sdnrgan1: SD-NR-GAN-I
• sdnrgan2: SD-NR-GAN-II
• sdnrgan3: SD-NR-GAN-III

Examples of generated images

CIFAR-10 with additive Gaussian noise

cifar10ag25: (A) Additive Gaussian noise with a fixed standard deviation

AmbientGAN^† is trained with the ground-truth noise model, while the other models are trained without full knowledge of the noise (i.e., the noise distribution type and noise amount).

CIFAR-10 with multiplicative Gaussian noise

cifar10mg25: (I) Multiplicative Gaussian noise with a fixed standard deviation

AmbientGAN^† is trained with the ground-truth noise model, while the other models are trained without full knowledge of the noise (i.e., the noise distribution type, noise amount, and signal-noise relationship).

Citation

If you find this work useful for your research, please cite our paper.

@inproceedings{kaneko2020NR-GAN,
  title={Noise Robust Generative Adversarial Networks},
  author={Kaneko, Takuhiro and Harada, Tatsuya},
  booktitle={Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition},
  year={2020}
}

Related work

1. A. Bora, E. Price, A. G. Dimakis. AmbientGAN: Generative Models from Lossy Measurements. In ICLR, 2018.
2. T. Kaneko, Y. Ushiku, T. Harada. Label-Noise Robust Generative Adversarial Networks. In CVPR, 2019.
3. T. Kaneko, Y. Ushiku, T. Harada. Class-Distinct and Class-Mutual Image Generation with GANs. In BMVC, 2019.