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Only watched the video, but one of the interesting things is the potential method to tell a generated image from a real one: namely, if you take a generated image, it's possible to find parameters which will generate exactly the same image. But if you take a real image, it's generally not possible to get exactly the same image, but only a similar one.

The exact point in the video:

https://youtu.be/c-NJtV9Jvp0?t=208

Also, looks like https://thispersondoesnotexist.com/ has been updated to use the new generator.

Phew I looked at three and they all had toothy smiles where the teeth grew out out of the lips and one had a floating tooth.

This is only possible if you have access to the model neural net... If you dont you cant tell the difference.

Actually i was wrong. Generative Adverserial Nets often work accross Machine Learning models...

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