That's how the earlier image generation models worked. You had one ai to generate images, and one to understand if it's a fake generated image or a real one (like, you have a real image of a dog, use the ai to generate an image of a dog, and pass both to the ai trying to see if it knows which is which). They both start out bad, but evolve together.

https://en.wikipedia.org/wiki/Generative_adversarial_network