when you print a tensor
b=a+2
print(b)

output:
tensor([[3., 3.],
        [3., 3.]], grad_fn=<AddBackward0>)

grad_fn is appended with a function that calculates the derivative value and a number.
However, there are times when the number is 0 or 1, so I don’t know what the standard is.
What do the numbers after the function mean?