This is our ongoing PyTorch implementation for ComboGAN. Code was written by Asha Anoosheh (built upon CycleGAN)

If you use this code for your research, please cite:

ComboGAN: Unrestrained Scalability for Image Domain Translation Asha Anoosheh, Eirikur Augustsson, Radu Timofte, Luc van Gool In Arxiv, 2017.

• Linux or macOS
• Python 3
• CPU or NVIDIA GPU + CUDA CuDNN

• Install PyTorch and dependencies from http://pytorch.org
• Install Torch vision from the source.

git clone https://github.com/pytorch/vision
cd vision
python setup.py install

• Install python libraries visdom and dominate.

pip install visdom
pip install dominate

• Clone this repo:

git clone https://github.com/AAnoosheh/ComboGAN.git
cd ComboGAN

Our ready datasets can be downloaded using ./datasets/download_dataset.sh <dataset_name>.

A pretrained model for the 14-painters dataset can be found HERE. Place under ./checkpoints/ and test using the instructions below, with args --name paint14_pretrained --dataroot ./datasets/painters_14 --n_domains 14 --which_epoch 1150.

Example running scripts can be found in the scripts directory.

• Train a model:

python train.py --name <experiment_name> --dataroot ./datasets/<your_dataset> --n_domains <N> --niter <num_epochs_constant_LR> --niter_decay <num_epochs_decaying_LR>

Checkpoints will be saved by default to ./checkpoints/<experiment_name>/

• Fine-tuning/Resume training:

python train.py --continue_train --which_epoch <checkpoint_number_to_load> --name <experiment_name> --dataroot ./datasets/<your_dataset> --n_domains <N> --niter <num_epochs_constant_LR> --niter_decay <num_epochs_decaying_LR>

• Test the model:

python test.py --phase test --name <experiment_name> --dataroot ./datasets/<your_dataset> --n_domains <N> --which_epoch <checkpoint_number_to_load> --serial_test

The test results will be saved to a html file here: ./results/<experiment_name>/<epoch_number>/index.html.

• Flags: see options/train_options.py for training-specific flags; see options/test_options.py for test-specific flags; and see options/base_options.py for all common flags.
• Dataset format: The desired data directory (provided by --dataroot) should contain subfolders of the form train*/ and test*/, and they are loaded in alphabetical order. (Note that a folder named train10 would be loaded before train2, and thus all checkpoints and results would be ordered accordingly.)
• CPU/GPU (default --gpu_ids 0): set--gpu_ids -1 to use CPU mode; set --gpu_ids 0,1,2 for multi-GPU mode. You need a large batch size (e.g. --batchSize 32) to benefit from multiple GPUs.
• Visualization: during training, the current results and loss plots can be viewed using two methods. First, if you set --display_id > 0, the results and loss plot will appear on a local graphics web server launched by visdom. To do this, you should have visdom installed and a server running by the command python -m visdom.server. The default server URL is http://localhost:8097. display_id corresponds to the window ID that is displayed on the visdom server. The visdom display functionality is turned on by default. To avoid the extra overhead of communicating with visdom set --display_id 0. Secondly, the intermediate results are also saved to ./checkpoints/<experiment_name>/web/index.html. To avoid this, set the --no_html flag.
• Preprocessing: images can be resized and cropped in different ways using --resize_or_crop option. The default option 'resize_and_crop' resizes the image to be of size (opt.loadSize, opt.loadSize) and does a random crop of size (opt.fineSize, opt.fineSize). 'crop' skips the resizing step and only performs random cropping. 'scale_width' resizes the image to have width opt.fineSize while keeping the aspect ratio. 'scale_width_and_crop' first resizes the image to have width opt.loadSize and then does random cropping of size (opt.fineSize, opt.fineSize).

NOTE: one should not expect ComboGAN to work on just any combination of input and output datasets (e.g. dogs<->houses). We find it works better if two datasets share similar visual content. For example, landscape painting<->landscape photographs works much better than portrait painting <-> landscape photographs.