The model generate nothing after retrained on coco2014

[GesilaA]

Hi, you are handsome and your work are awesome! Thank you for your work.
I got a problem when I try to train a smaller 'TransformerNet' model, all input images are resize to 256x256 while training.
The 'Content' and the 'Style' reports high loss value:

And while train the model after some epoches, the model will never generate a picture:

I'm looking forward to your guidance.

[GesilaA]

The loss value is abnormal while the generator could never output a picture.