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[Discussion] Cannot make CycleGAN work on a simple toy MNIST example

[Discussion] Cannot make CycleGAN work on a simple toy MNIST example

Hi. I tried implementing CycleGAN from scratch. And I tested my implementation on a toy example where the first domain consists of normal MNIST images and the other domain consists of flipped MNIST images. I think the task sounds simple enough. However, while the learned translations are able to generate sharp (normal/flipped) MNIST images, the mappings are not correct at all (e.g., 7s are mapped to 1s or 6s ). Please refer to the figures below. Did anyone encounter the sample problem when using CycleGAN? I think overall my architecture is correct (having adversarial loss and cycle loss). There may be few differences in the generators and discriminators but I don’t think it would make that much difference.

During the first few iterations, generated images are not clear. But it is fair enough

After many iterations, the generated flipped images look sharp. But the mappings are not correct at all.

submitted by /u/laituan245
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