torch.trace

torch.trace(input) → Tensor

Returns the sum of the elements of the diagonal of the input 2-D matrix.

Example:

>>> x = torch.arange(1., 10.).view(3, 3)
>>> x
tensor([[ 1.,  2.,  3.],
        [ 4.,  5.,  6.],
        [ 7.,  8.,  9.]])
>>> torch.trace(x)
tensor(15.)