text: Title: Notes on Colorization
  Body: > . Also set --input_nc 1 and --output_nc 2.
  
  From [notes-on-colorization](https://github.com/junyanz/pytorch-CycleGAN-and-pix2pix/blob/master/docs/tips.md#notes-on-colorization).
  
  Why 2? I assume colorization returns an rgb image? If this is not a typo, I am curious about why 2 is advised.
  