torch.block_diag

torch.block_diag(*tensors) [source]

Create a block diagonal matrix from provided tensors.

Parameters

*tensors – One or more tensors with 0, 1, or 2 dimensions.

Returns

A 2 dimensional tensor with all the input tensors arranged in

order such that their upper left and lower right corners are diagonally adjacent. All other elements are set to 0.

Return type

Tensor

Example:

>>> import torch
>>> A = torch.tensor([[0, 1], [1, 0]])
>>> B = torch.tensor([[3, 4, 5], [6, 7, 8]])
>>> C = torch.tensor(7)
>>> D = torch.tensor([1, 2, 3])
>>> E = torch.tensor([[4], [5], [6]])
>>> torch.block_diag(A, B, C, D, E)
tensor([[0, 1, 0, 0, 0, 0, 0, 0, 0, 0],
        [1, 0, 0, 0, 0, 0, 0, 0, 0, 0],
        [0, 0, 3, 4, 5, 0, 0, 0, 0, 0],
        [0, 0, 6, 7, 8, 0, 0, 0, 0, 0],
        [0, 0, 0, 0, 0, 7, 0, 0, 0, 0],
        [0, 0, 0, 0, 0, 0, 1, 2, 3, 0],
        [0, 0, 0, 0, 0, 0, 0, 0, 0, 4],
        [0, 0, 0, 0, 0, 0, 0, 0, 0, 5],
        [0, 0, 0, 0, 0, 0, 0, 0, 0, 6]])