The Deterioration of generated image with each epoch after certain numbers

As we can see here the image generated at the 71th epoch is more clear(clean) than the image generated at the 440th step. I was thinking with more epochs the generation should be enhanced ,but reverse is happening. What is the reason behind such a strange behaviour.

It’s been a while since I took these courses, but I’m pretty sure that Prof Zhou discusses this in some detail in the lectures. It turns out that convergence is never guaranteed. There is always a possibility that the training of the discriminator and the generator gets unbalanced and one wins out. Even if the training is going well at a particular epoch, that doesn’t mean things can’t turn sour later.