I have a first tensor named “target” that is a 1D tensor that contain n integers from 0 to 3
target = (2,0,3,2,1,1,2,3,0,…,2)
Within the framework of a custom loss function, I would like to create a 2D tensor of sise (n, 4) for which the value of each item would be equal to the absolute difference between the target and the column
adj_target = ((2,1,0,1),(0,1,2,3),(3,2,1,0),…)
Example :
First row  of adj_target is a function of the first row of target = 2

1st column = abs(0-2) = 2
2nd column = abs(1-2) = 1
3rd column = abs(2-2) = 0
-4th column = abs(3-2) = 1
Second row of adj_target is a function of the first row of target = 0
1st column = abs(0-0) = 0
2nd column = abs(1-0) = 1
3rd column = abs(2-0) = 2
-4th column = abs(3-0) = 3
Third row of adj_target is a function of the first row of target = 3
1st column = abs(0-3) = 3
2nd column = abs(1-3) = 2
3rd column = abs(2-3) = 1
-4th column = abs(3-3) = 0
etc…

Is there an easy and efficient way to do it ?
Thanks in advance