GAN-Slimming

GAN Slimming: All-in-One GAN Compression by A Unified Optimization Framework

Haotao Wang, Shupeng Gui, Haichuan Yang, Ji Liu, Zhangyang Wang

In ECCV 2020 (Spotlight)

Overview

An all-in-one GAN compression method integrating model distillation, channel pruning and quantization under GAN minimax optimization framework.

Visualization Results

Image-to-image translation by (compressed) CycleGAN:

Training

1. Download dataset:

./download_dataset <dataset_name>

This will download the dataset to folder datasets/<dataset_name> (e.g., datasets/summer2winter_yosemite).

2. Get the original dense CycleGAN:

summer2winter_yosemite dataset

Use the official CycleGAN codes to train original dense CycleGAN.

horse2zebra dataset

Using the pretrained dense generator and discriminator to initialize G and D for GAN-Slimming is necessary on horse2zebra dataset. Downloaded the dense models for GS32 and GS8 from here and here respectively, and put them under the project root path.

3. Generate style transfer results on training set

Use the pretrained dense generator to generate style transfer results on training set and put the style transfer results to folder train_set_result/<dataset_name>. For example, train_set_result/summer2winter_yosemite/B/2009-12-06 06:58:39_fake.png is the fake winter image transferred from the real summer image datasets/summer2winter_yosemite/A/2009-12-06 06:58:39.png using the original dense CycleGAN.

4. Compress

GS-32:

python gs.py --rho 0.01 --dataset <dataset_name> --task <task_name>

GS-8:

python gs.py --rho 0.01 --quant --dataset <dataset_name> --task <task_name>

The training results (checkpoints, loss curves, etc.) will be saved in results/<dataset_name>/<task_name>. Valid <dataset_name>s are: horse2zebra, summer2winter_yosemite. Valid <task_name>s are: A2B, B2A. (For example, horse2zebra/A2B means transferring horse to zebra and horse2zebra/B2A means transferring zebra to horse.)

5. Extract compact subnetwork obtained by GS

GAN slimming has pruned some channels in the network by setting the channel-wise mask to zero. Now we need to extract the actual compressed subnetowrk.

python extract_subnet.py --dataset <dataset_name> --task <task_name> --model_str <model_str> 

The extracted subnetworks will be saved in subnet_structures/<dataset_name>/<task_name>

6. Finetune subnetwork

python finetune.py --dataset <dataset_name> --task <task_name> --base_model_str <base_model_str>

Finetune results will be saved in finetune_results/<dataset_name>/<task_name>

Pretrianed Models

Pretrained models are available through Google Drive.

Citation

If you use this code for your research, please cite our paper.

@inproceedings{wang2020ganslimming,
  title={GAN Slimming: All-in-One GAN Compression by A Unified Optimization Framework},
  author={Wang, Haotao and Gui, Shupeng and Yang, Haichuan and Liu, Ji and Wang, Zhangyang},
  booktitle={European Conference on Computer Vision},
  year={2020}
}

Our Related Work

Please also check our concurrent work on combining neural architecture search (NAS) and model distillation for GAN compression:

Yonggan Fu, Wuyang Chen, Haotao Wang, Haoran Li, Yingyan Lin, and Zhangyang Wang. "AutoGAN-Distiller: Searching to Compress Generative Adversarial Networks." ICML, 2020. [pdf] [code]