spd_learn.functional.untril_embed#

spd_learn.functional.untril_embed(v: Tensor, n: int) → Tensor[source]#

Inverse of tril_embed().

Reconstructs a hollow symmetric matrix from its scaled lower-triangular embedding vector.

Parameters:

  • v (torch.Tensor) – Vectorized hollow symmetric matrix of shape (…, n*(n-1)//2).

  • n (int) – Dimension of the square matrix to reconstruct.

Returns:

Hollow symmetric matrix of shape (…, n, n).

Return type:

torch.Tensor