Zeroing the diagonal of a matrix by multiplying by (1-I)

Question

I have a tensor, lets say like this:

tensor([[2.7183, 0.4005, 2.7183, 0.5236],
    [0.4005, 2.7183, 0.4004, 1.3469],
    [2.7183, 0.4004, 2.7183, 0.5239],