Potential LPIPS evaluation issue? Images don't seem to be normalized to [-1, 1]

[dsrjd]

Dear authors,

Thanks for the great work. It seems that the LPIPS evaluation (https://github.com/VITA-Group/GNT/blob/main/eval.py#L216-L217) doesn't normalize the images to [-1, 1] (which is expected as documented in https://github.com/richzhang/PerceptualSimilarity/tree/master#quick-start), could you please look into this potential issue? Thanks.