let's say I want you know an image what does it look like in the day time and what does it look like in night time and then again we can think of it as having a distribution of images of day time and then also a distribution of images in night time and then you want to align them in certain way so you say why is this helpful like one way that this could be helpful is say if we want to train at home as vehicles to drive safely at night but then it's harder to collect data at night so is there a way for us to collect corresponding images during