  We present Face0, a novel way to instantaneously condition a text-to-image
generation model on a face, in sample time, without any optimization procedures
such as fine-tuning or inversions. We augment a dataset of annotated images
with embeddings of the included faces and train an image generation model, on
the augmented dataset. Once trained, our system is practically identical at
inference time to the underlying base model, and is therefore able to generate
images, given a user-supplied face image and a prompt, in just a couple of
seconds. Our method achieves pleasing results, is remarkably simple, extremely
fast, and equips the underlying model with new capabilities, like controlling
the generated images both via text or via direct manipulation of the input face
embeddings. In addition, when using a fixed random vector instead of a face
embedding from a user supplied image, our method essentially solves the problem
of consistent character generation across images. Finally, while requiring
further research, we hope that our method, which decouples the model's textual
biases from its biases on faces, might be a step towards some mitigation of
biases in future text-to-image models.
