mars.tensor.
diag
Extract a diagonal or construct a diagonal tensor.
See the more detailed documentation for mt.diagonal if you use this function to extract a diagonal and wish to write to the resulting tensor
mt.diagonal
v (array_like) – If v is a 2-D tensor, return its k-th diagonal. If v is a 1-D tensor, return a 2-D tensor with v on the k-th diagonal.
k (int, optional) – Diagonal in question. The default is 0. Use k>0 for diagonals above the main diagonal, and k<0 for diagonals below the main diagonal.
sparse (bool, optional) – Create sparse tensor if True, False as default
gpu (bool, optional) – Allocate the tensor on GPU if True, False as default
chunk_size (int or tuple of int or tuple of ints, optional) – Desired chunk size on each dimension
out – The extracted diagonal or constructed diagonal tensor.
Tensor
See also
diagonal
Return specified diagonals.
diagflat
Create a 2-D array with the flattened input as a diagonal.
trace
Sum along diagonals.
triu
Upper triangle of a tensor.
tril
Lower triangle of a tensor.
Examples
>>> import mars.tensor as mt
>>> x = mt.arange(9).reshape((3,3)) >>> x.execute() array([[0, 1, 2], [3, 4, 5], [6, 7, 8]])
>>> mt.diag(x).execute() array([0, 4, 8]) >>> mt.diag(x, k=1).execute() array([1, 5]) >>> mt.diag(x, k=-1).execute() array([3, 7])
>>> mt.diag(mt.diag(x)).execute() array([[0, 0, 0], [0, 4, 0], [0, 0, 8]])