Source code for dgl.sparse.elementwise_op

```# pylint: disable=anomalous-backslash-in-string
"""DGL elementwise operator module."""
from typing import Union

from .sparse_matrix import SparseMatrix
from .utils import Scalar

__all__ = ["add", "sub", "mul", "div", "power"]

[docs]def add(A: SparseMatrix, B: SparseMatrix) -> SparseMatrix:
r"""Elementwise addition for ``SparseMatrix``, equivalent to ``A + B``.

Parameters
----------
A : SparseMatrix
Sparse matrix
B : SparseMatrix
Sparse matrix

Returns
-------
SparseMatrix
Sparse matrix

Examples
--------
>>> indices = torch.tensor([[1, 0, 2], [0, 1, 2]])
>>> val = torch.tensor([10, 20, 30])
>>> A = dglsp.spmatrix(indices, val)
>>> B = dglsp.diag(torch.arange(1, 4))
SparseMatrix(indices=tensor([[0, 0, 1, 1, 2],
[0, 1, 0, 1, 2]]),
values=tensor([1, 20, 10,  2, 33]),
shape=(3, 3), nnz=5)
"""
return A + B

[docs]def sub(A: SparseMatrix, B: SparseMatrix) -> SparseMatrix:
r"""Elementwise subtraction for ``SparseMatrix``, equivalent to ``A - B``.

Parameters
----------
A : SparseMatrix
Sparse matrix
B : SparseMatrix
Sparse matrix

Returns
-------
SparseMatrix
Sparse matrix

Examples
--------
>>> indices = torch.tensor([[1, 0, 2], [0, 1, 2]])
>>> val = torch.tensor([10, 20, 30])
>>> A = dglsp.spmatrix(indices, val)
>>> B = dglsp.diag(torch.arange(1, 4))
>>> dglsp.sub(A, B)
SparseMatrix(indices=tensor([[0, 0, 1, 1, 2],
[0, 1, 0, 1, 2]]),
values=tensor([-1, 20, 10, -2, 27]),
shape=(3, 3), nnz=5)
"""
return A - B

[docs]def mul(
A: Union[SparseMatrix, Scalar], B: Union[SparseMatrix, Scalar]
) -> SparseMatrix:
r"""Elementwise multiplication for ``SparseMatrix``, equivalent to
``A * B``.

If both :attr:`A` and :attr:`B` are sparse matrices, both of them should be
diagonal matrices.

Parameters
----------
A : SparseMatrix or Scalar
Sparse matrix or scalar value
B : SparseMatrix or Scalar
Sparse matrix or scalar value

Returns
-------
SparseMatrix
Sparse matrix

Examples
--------
>>> indices = torch.tensor([[1, 0, 2], [0, 3, 2]])
>>> val = torch.tensor([10, 20, 30])
>>> A = dglsp.spmatrix(indices, val)
>>> dglsp.mul(A, 2)
SparseMatrix(indices=tensor([[1, 0, 2],
[0, 3, 2]]),
values=tensor([20, 40, 60]),
shape=(3, 4), nnz=3)

>>> D = dglsp.diag(torch.arange(1, 4))
>>> dglsp.mul(D, 2)
SparseMatrix(indices=tensor([[0, 1, 2],
[0, 1, 2]]),
values=tensor([2, 4, 6]),
shape=(3, 3), nnz=3)

>>> D = dglsp.diag(torch.arange(1, 4))
>>> dglsp.mul(D, D)
SparseMatrix(indices=tensor([[0, 1, 2],
[0, 1, 2]]),
values=tensor([1, 4, 9]),
shape=(3, 3), nnz=3)
"""
return A * B

[docs]def div(A: SparseMatrix, B: Union[SparseMatrix, Scalar]) -> SparseMatrix:
r"""Elementwise division for ``SparseMatrix``, equivalent to ``A / B``.

If both :attr:`A` and :attr:`B` are sparse matrices, both of them should be
diagonal matrices.

Parameters
----------
A : SparseMatrix
Sparse matrix
B : SparseMatrix or Scalar
Sparse matrix or scalar value

Returns
-------
SparseMatrix
Sparse matrix

Examples
--------
>>> A = dglsp.diag(torch.arange(1, 4))
>>> B = dglsp.diag(torch.arange(10, 13))
>>> dglsp.div(A, B)
SparseMatrix(indices=tensor([[0, 1, 2],
[0, 1, 2]]),
values=tensor([0.1000, 0.1818, 0.2500]),
shape=(3, 3), nnz=3)

>>> A = dglsp.diag(torch.arange(1, 4))
>>> dglsp.div(A, 2)
SparseMatrix(indices=tensor([[0, 1, 2],
[0, 1, 2]]),
values=tensor([0.5000, 1.0000, 1.5000]),
shape=(3, 3), nnz=3)

>>> indices = torch.tensor([[1, 0, 2], [0, 3, 2]])
>>> val = torch.tensor([1, 2, 3])
>>> A = dglsp.spmatrix(indices, val, shape=(3, 4))
>>> dglsp.div(A, 2)
SparseMatrix(indices=tensor([[1, 0, 2],
[0, 3, 2]]),
values=tensor([0.5000, 1.0000, 1.5000]),
shape=(3, 4), nnz=3)
"""
return A / B

[docs]def power(A: SparseMatrix, scalar: Scalar) -> SparseMatrix:
r"""Elementwise exponentiation ``SparseMatrix``, equivalent to
``A ** scalar``.

Parameters
----------
A : SparseMatrix
Sparse matrix
scalar : Scalar
Exponent

Returns
-------
SparseMatrix
Sparse matrix

Examples
--------
>>> indices = torch.tensor([[1, 0, 2], [0, 3, 2]])
>>> val = torch.tensor([10, 20, 30])
>>> A = dglsp.spmatrix(indices, val)
>>> dglsp.power(A, 2)
SparseMatrix(indices=tensor([[1, 0, 2],
[0, 3, 2]]),
values=tensor([100, 400, 900]),
shape=(3, 4), nnz=3)

>>> D = dglsp.diag(torch.arange(1, 4))
>>> dglsp.power(D, 2)
SparseMatrix(indices=tensor([[0, 1, 2],
[0, 1, 2]]),
values=tensor([1, 4, 9]),
shape=(3, 3), nnz=3)
"""
return A**scalar
```