spyrit.misc.walsh_hadamard.sequency_perm

spyrit.misc.walsh_hadamard.sequency_perm(X, ind=None)

Permute the last dimension of a tensor. By defaults this allows the sequency order to be obtained from the natural order.

Args:

X (np.ndarray): input of shape (*,n).

ind : list of index length n. Defaults to indices to get sequency order.

Returns:

np.ndarray: output of shape (*,n)

Example :

>>> import spyrit.misc.walsh_hadamard as wh
>>> x = torch.tensor([1, 3, 0, -1, 7, 5, 1, -2])
>>> x = x[None, None, :]
>>> x = wh.sequency_perm(x)
>>> print(x)
tensor([[[ 1,  7,  1,  0, -1, -2,  5,  3]]])
>>> print(x.shape)
torch.Size([1, 1, 8])