RandAffine translate_range parameter should be relative.

Hi,

I'm trying to implement a random translate using MONAI. However, I've noticed the options are a little limited... To formalize a random translate I need to use RandAffine and pass translate_range argument specifying the numbers of pixels to be shifted... I believe this is not a good practice for bigger projects, as passing a relative range to the dimensions would be better.

To explain it in code. Imagine I have a 400x400x400 volume. I want to implement a random translate with range from 0 to 200 pixels (half the pixels in each dimension).

MONAI expects: transforms.RandAffine(prob=1, translate_range=200, padding_mode="zeros")
I believe it would be better to have transforms.RandAffine(prob=1, translate_range=0.5, padding_mode="zeros")

What do you think? Btw is there any other alternative to make a relative translation with MONAI? Or do I need to use another lib?

Thank you :)

Start by reviewing MONAI's RandAffine entry point and the current translate_range behavior described in the issue. Define how a relative range should apply across volume dimensions, then validate the expected behavior with focused tests and documentation.