Add grayscale conversion to pasa model?

It seems that the pasa model expect single channel inputs. Should we implement a transform to carry a preventive conversion from RGB to grayscale and put it into the model transforms?

Yes, please.

This is now implemented on !6 (merged). It will be closed when that is finally merged.

mentioned in merge request !6 (merged)

closed with merge request !6 (merged)

mentioned in commit adf29dd1