Collaborative-Distillation

Official PyTorch code for our CVPR-20 poster paper "Collaborative Distillation for Ultra-Resolution Universal Style Transfer", where we propose a new knowledge distillation method to reduce VGG-19 filters, realizing the ultra-resolution universal style transfer on a single 12GB GPU. We focus on model compression instead of new stylization schemes. For stylization, our method builds upon WCT.

Environment

• OS: Linux (Ubuntu 1404 and 1604 checked. It should be all right for most linux platforms. Windows and MacOS not checked.)
• python==3.6.9 (conda to manage environment is suggested)
• The needed libraries are summarized in requirements.txt. Simply install them by pip install -r requirements
• CUDA (cuDNN is not necessary)

After the installlations, download the code:

git clone https://github.com/MingSun-Tse/Collaborative-Distillation.git

Test (style transfer)

Step 1: Prepare images

• Contents are placed in PytorchWCT/content, where ultra-res contents are placed in PytorchWCT/content/UHD_content. Same path setting for the styles.
• Since the ultra-res images can be quite large, we only place two samples in this repo. For more ultra-res contents and styles presented in our paper, please download them from this google drive.

Image copyrights: We use the UHD images from this wallpaper website. All copyrights are attributed to them and thanks to them!

Step 2: Prepare models

• For original WCT: Download the unpruned models (which are from the official WCT implementation). Unzip and place them under trained_models/original_wct_models.
• For ultra-resolution WCT: We use our pruned VGG-19. The models are already in the trained_models/wct_se_16x_new (for encoders) and trained_models/wct_se_16x_new_sd (for decoders).

Step 3: Stylization

• Under the PytorchWCT folder, please run the following scripts. The stylized results will be saved in PytorchWCT/stylized_results.

# use original VGG-19, normal images
CUDA_VISIBLE_DEVICES=0 python WCT.py --debug --mode original

# use original VGG-19, ultra-res images
CUDA_VISIBLE_DEVICES=0 python WCT.py --debug --mode original --UHD

# use our pruned VGG-19, normal images
CUDA_VISIBLE_DEVICES=0 python WCT.py --debug --mode 16x

# use our pruned VGG-19, ultra-res images
CUDA_VISIBLE_DEVICES=0 python WCT.py --debug --mode 16x --UHD

# If your RAM cannot afford some large images, you can change the content and style size via '--content_size' and '--style_size'
CUDA_VISIBLE_DEVICES=0 python WCT.py --debug --mode 16x --UHD --content_size 3000 --style_size 2000

In default, the above scripts will test all possible content-style combinations (i.e., for 3 contents with 4 styles, there will be 3x4 stylized results). If you only want to test a specific pair, say, content "green_park-wallpaper-3840x2160.jpg" with style "Vincent_2K.jpg", you can use the option --picked_content_mark and --picked_style_mark to select specific pairs. E.g., the following will only choose the content whose name includes "green_park" and the style whose name includes "Vincent".

CUDA_VISIBLE_DEVICES=0 python WCT.py --debug --mode 16x --UHD --picked_content_mark green_park --picked_style_mark Vincent

Train (model compression)

Step 1: Prepare dataset

Download the MS-COCO 2014 training set and unzip it at path data/COCO/train2014.

Step 2: Prepare models

For training the SE (small encoder), we need the original decoder (big decoder or BD). We trained our own BD following the WCT paper. You can download them from this google drive and put them at path trained_models/our_BD.

Step 3: Train the compressed encoders

Under the root folder, run

CUDA_VISIBLE_DEVICES=0 python main.py --mode wct_se --pretrained_init --screen --stage 5 -p wct_se_stage5
CUDA_VISIBLE_DEVICES=0 python main.py --mode wct_se --pretrained_init --screen --stage 4 -p wct_se_stage4
CUDA_VISIBLE_DEVICES=0 python main.py --mode wct_se --pretrained_init --screen --stage 3 -p wct_se_stage3
CUDA_VISIBLE_DEVICES=0 python main.py --mode wct_se --pretrained_init --screen --stage 2 -p wct_se_stage2
CUDA_VISIBLE_DEVICES=0 python main.py --mode wct_se --pretrained_init --screen --stage 1 -p wct_se_stage1

• The log and trained models will be saved in a new-built project folder under Experiments.
• --pretrained_init is to indicate using base models for initialization, which are obtained by pruning the filters with the least L1-norms (see also 2017-ICLR-Filter Pruning)

Step 4: Train the corresponding decoders

CUDA_VISIBLE_DEVICES=0 python main.py --mode wct_sd --pretrained_init --screen --lw_perc 0.01 --stage 5 -p wct_sd_stage5 --SE <SE path>
CUDA_VISIBLE_DEVICES=0 python main.py --mode wct_sd --pretrained_init --screen --lw_perc 0.01 --stage 4 -p wct_sd_stage4 --SE <SE path>
CUDA_VISIBLE_DEVICES=0 python main.py --mode wct_sd --pretrained_init --screen --lw_perc 0.01 --stage 3 -p wct_sd_stage3 --SE <SE path>
CUDA_VISIBLE_DEVICES=0 python main.py --mode wct_sd --pretrained_init --screen --lw_perc 0.01 --stage 2 -p wct_sd_stage2 --SE <SE path>
CUDA_VISIBLE_DEVICES=0 python main.py --mode wct_sd --pretrained_init --screen --lw_perc 0.01 --stage 1 -p wct_sd_stage1 --SE <SE path>

• <SE path> is to specify the small encoder model trained in Step 3. A path example for stage5 is Experiments/*wct_se_stage5*/weights/*.pth

Results

Acknowledgments

In this code we refer to the following implementations: PytorchWCT, UniversalStyleTransfer, pytorch-AdaIN, AdaIN-style. Great thanks to them!

Reference

Please cite this in your publication if our work helps your research. Should you have any questions, welcome to reach out to Huan Wang ([email protected]).

@inproceedings{wang2020collaborative,
  Author = {Wang, Huan and Li, Yijun and Wang, Yuehai and Hu, Haoji and Yang, Ming-Hsuan},
  Title = {Collaborative Distillation for Ultra-Resolution Universal Style Transfer},
  Booktitle = {Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition (CVPR)},
  Year = {2020}
}