Flickr-Faces-HQ (FFHQ) is a high-quality image dataset of human faces,
originally created as a benchmark for generative adversarial networks (GAN):

    A Style-Based Generator Architecture for Generative Adversarial Networks
    Tero Karras (NVIDIA), Samuli Laine (NVIDIA), Timo Aila (NVIDIA)
    http://stylegan.xyz/paper

The individual images were published in Flickr by their respective authors
under either Creative Commons BY 2.0, Creative Commons BY-NC 2.0,
Public Domain Mark 1.0, Public Domain CC0 1.0, or U.S. Government Works
license. All of these licenses allow free use, redistribution, and adaptation
for non-commercial purposes. However, some of them require giving appropriate
credit to the original author, as well as indicating any changes that were
made to the images. The license and original author of each image are
indicated in the metadata.

    https://creativecommons.org/licenses/by/2.0/
    https://creativecommons.org/licenses/by-nc/2.0/
    https://creativecommons.org/publicdomain/mark/1.0/
    https://creativecommons.org/publicdomain/zero/1.0/
    http://www.usa.gov/copyright.shtml

The dataset itself (including JSON metadata, download script, and
documentation) is made available under Creative Commons BY-NC-SA 4.0 license
by NVIDIA Corporation. You can use, redistribute, and adapt it for
non-commercial purposes, as long as you (a) give appropriate credit by
citing our paper, (b) indicate any changes that you've made, and
(c) distribute any derivative works under the same license.

    https://creativecommons.org/licenses/by-nc-sa/4.0/