text: Title: Looking for performance metric for cyclegan
  Body: Hi, we often apply cycleGAN for unpaired data. So, some of the performance metric will be not applied
  - SSIM
  - PSNR
  
  For my dataset, I would like to use cyclegan to mapping an image from winter session to spring session and they have no pair data for each image. Could you tell me how can I evaluate the cyclegan performance (i.e how to know the output is close to a realistic image...)
  