Meta Optimal Transport

This repository is by Brandon Amos, Samuel Cohen, Giulia Luise, and Ievgen Redko and contains the source code building on JAX and OTT to reproduce the experiments for our Meta Optimal Transport paper.

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Yijiang Pang has posted an unofficial PyTorch re-implementation in the discrete setting here.

Setup

After cloning this repository and installing PyTorch on your system, you can install dependencies with:

pip install -r requirements.txt

set up the code with:

python3 setup.py develop

Basic structure of this repository

• ./conf: Hydra configuration
• ./meta_ot: Meta OT models and other utility code used by the experiments
• ./paper: Source for our paper
• ./train_discrete.py: Training code for Meta OT in discrete settings
• ./train_color_meta.py: Training code for color transfer with Meta OT
• ./train_color_single.py: Our re-implementation of W2GN for color transfer
• ./eval_discrete.py: Evaluation and analysis for discrete OT
• ./eval_color.py: Evaluation and analysis for color transfer
• ./plot_mnist.py: Further plotting for the MNIST experiment
• ./plot_world_pair.py: Further plotting for the spherical transport experiment
• ./create_video_mnist.py: Create the MNIST transport video
• ./create_video_world.py: Create the spherical transport video
• ./create_video_color.py: Create the color transport video

Reproducing our experimental results

MNIST

This code will automatically download the MNIST dataset for training and evaluation. You can run the training code with:

./train_discrete.py data=mnist

This will create a directory saving out the model and log informations, which you can evaluate and plot with:

./eval_discrete.py <exp_dir>
./plot_mnist.py <exp_dir>

Spherical transport

First download the 2020 Tiff data at 15-minute resolution and save the file to data/pop-15min.tif. Then you can run the training code with:

./train_discrete.py data=world

This will create a directory saving out the model and log informations, which you can evaluate and plot with:

./eval_discrete.py <exp_dir>
./plot_world_pair.py <exp_dir>

Color transfer

First download images from WikiArt into data/paintings by running:

./data/download-wikiart.py

Then you can run the training code with:

./train_color_meta.py

This will create a directory saving out the model and log informations, which you can evaluate and plot with:

./eval_color.py <exp_dir>

Recreating our videos

Our main video can be re-created by running the following scripts:

./create_video_mnist.py <mnist_exp_dir>
./create_video_world.py <world_exp_dir>
./create_video_color.py <color_exp_dir>

Citations

If you find this repository helpful for your publications, please consider citing our paper:

@misc{amos2022meta,
  title={Meta Optimal Transport},
  author={Brandon Amos and Samuel Cohen and Giulia Luise and Ievgen Redko},
  year={2022},
  eprint={2206.05262},
  archivePrefix={arXiv},
  primaryClass={cs.LG}
}

Licensing

The source code in this repository is licensed under the CC BY-NC 4.0 License.