Some generated images are left-right flipped

[russelldj]

Hi all,

Great work. Perhaps this is a one-off error but I found it interesting. While training with FastCUT and an input resolution of 512x512 I found that some of my generated images are left-right flipped. Surprisingly, the structure seems like it would match if the image were flipped back. Here are some examples

[taesungp]

Strange! Could you disable flipping when you run this and see if it still happens? --no_flip is the command line option.

[Hirnmoder]

Well, I don't think it's that strange. It is just how FastCUT is implemented.

• models/cut_model.py Line 48: Option flip_equivariance is enabled for FastCUT by default
• models/cut_model.py Lines 149 to 154: The input image is flipped (50% chance) and consequently the output image self.fake is flipped, too
• self.fake does not get flipped back → hence, we see the horizontally flipped image in visom

Now regarding the other parts of the question:

• The third image is real_B, so there is no such thing as a "structure"
• Visdom shows the properties real_A, fake_B and real_B. But real_A contains the non-flipped original image, fake_B however contains the flipped fake image

[russelldj]

Thanks for figuring this out.