When the X and Y are not the same dimension, like X=[1*10] vector, Y=[1*84] vector, how to modify the RIM to let it work well?

[mrleiyz]

I would like to migrate the RIM to another inverse ill-posed problem, like Y=AX+B, based on Y to obtain X, but X and Y are not the same dimensions, like X=[1, 10] vector, Y=[1, 84] vector, so gradient(X, Y) cannot be conducted, how do I modify the RIM to let it work well?