This is usually done, most GAN paper show in the appendix a list of generated images with distance to images in the dataset, for example check from pages 14 to

This is usually done, most GAN paper show in the appendix a list of generated images with distance to images in the dataset, for example check from pages 14 to 16 in this GAN paper [1]. Note that measuring distances between images is not trivial and some measurement space must be chosen, typically cosine at the last ResNet feature map. [1] https://openreview.net/pdf?id=B1xsqj09Fm https://openreview.net/pdf?id=B1xsqj09Fm