According to docs:
ColorJitter(brightness=0, contrast=0, saturation=0, hue=0)
For example, what are written in docs about brightness:
brightness (float) – How much to jitter brightness. brightness_factor is chosen uniformly from [max(0, 1 - brightness), 1 + brightness].
So, when brightness = 0 we get [1, 1]. It’s really strange, isn’t it?
Maybe set up brightness = 1 by default?
Also, how to choose these parameters for my certain task?
The default value doesn’t perform any brightness augmentation so it seems to be a reasonable value in my opinion.
You could have a look at your data and try to estimate how much the brightness differ in all images. Based on this estimate you can chose the amount of augmentation.
Hm, then these parameters should be without initial values. Otherwise, I wait some augmentation. Because when I use RandomGrayscale I can not even think about parameters, just get augmentation.