Wasserstein of Wasserstein Loss for Generative Models (WWGAN)

A simple implementation of WWGAN and the Wasserstein image-space gradient penalty (Wasserstein ground metric).

Based on Marvin Cao's wgan-gp and Nathan Inkawhich's example.

The Wasserstein of Wasserstein loss for generative models, uses an optimal transport metric as the distance measure between images. This is then formulated in the WGAN-GP formulation.

Details can be found in our paper Wasserstein of Wasserstein Loss for Learning Generative Models.

Getting started

Setup

Clone the repository using

$ git clone https://github.com/dukleryoni/WWGAN.git

Prerequisites

The following packages are required to run the repo: PyTorch, torchvision, Scipy, Pillow, TensorFlow, TensorBoard. For your convinience, you can create the suitable conda environment using wwgan_env.yml by running

$ conda create --name name_of_wwgan_env --clone wwgan_env.yml

Download training data

Download and extract the CelebA image dataset from google drive. See gdown for downloading from google drive on command line.

In train.py , line 34, change dataroot to the correct path to the downloaded CelebA directory.

Evaluation using FID

For evaluating the network using the Freceht Inception Distance (FID) score we use the TTUR repository. In the WWGAN repository, we clone TTUR and download the pre-computed FID statistics for CelebA:

$ mkdir Frechet_Inception_Distance
$ cd Frechet_Inception_Distance
$ git clone https://github.com/bioinf-jku/TTUR.git
$ wget http://bioinf.jku.at/research/ttur/ttur_stats/fid_stats_celeba.npz # get pre-computed stats for FID

Run and inspect results

Now in the WWGAN repo train the model by simply running python train.py

The user can specify hyperparamters for diffferent runs, (e.g. --ngpu 2 for number of GPUs for training).

After training the user can inspect simple properties of the generator using the Jupyter notebook Analyze_generated_images.ipynb.

Wasserstein ground metric gradient penalty

The code for computing the Wasserstein gradient penalty is given in wwgan_utils.py and invloves the most new implementation details. One can compute the Wsserstein ground metic by calling the calc_wgp() function.

brechetp/WWGAN