  Dataset distillation aims to compress a dataset into a much smaller one so
that a model trained on the distilled dataset achieves high accuracy. Current
methods frame this as maximizing the distilled classification accuracy for a
budget of K distilled images-per-class, where K is a positive integer. In this
paper, we push the boundaries of dataset distillation, compressing the dataset
into less than an image-per-class. It is important to realize that the
meaningful quantity is not the number of distilled images-per-class but the
number of distilled pixels-per-dataset. We therefore, propose Poster Dataset
Distillation (PoDD), a new approach that distills the entire original dataset
into a single poster. The poster approach motivates new technical solutions for
creating training images and learnable labels. Our method can achieve
comparable or better performance with less than an image-per-class compared to
existing methods that use one image-per-class. Specifically, our method
establishes a new state-of-the-art performance on CIFAR-10, CIFAR-100, and
CUB200 using as little as 0.3 images-per-class.
