"""DGL sparse matrix module."""
# pylint: disable= invalid-name
from typing import Optional, Tuple
import torch
[docs]class SparseMatrix:
r"""Class for sparse matrix."""
def __init__(self, c_sparse_matrix: torch.ScriptObject):
self.c_sparse_matrix = c_sparse_matrix
def __repr__(self):
return _sparse_matrix_str(self)
@property
def val(self) -> torch.Tensor:
"""Returns the values of the non-zero elements.
Returns
-------
torch.Tensor
Values of the non-zero elements
"""
return self.c_sparse_matrix.val()
@property
def shape(self) -> Tuple[int]:
"""Returns the shape of the sparse matrix.
Returns
-------
Tuple[int]
The shape of the sparse matrix
"""
return tuple(self.c_sparse_matrix.shape())
@property
def nnz(self) -> int:
"""Returns the number of non-zero elements in the sparse matrix.
Returns
-------
int
The number of non-zero elements of the matrix
"""
return self.c_sparse_matrix.nnz()
@property
def dtype(self) -> torch.dtype:
"""Returns the data type of the sparse matrix.
Returns
-------
torch.dtype
Data type of the sparse matrix
"""
return self.c_sparse_matrix.val().dtype
@property
def device(self) -> torch.device:
"""Returns the device the sparse matrix is on.
Returns
-------
torch.device
The device the sparse matrix is on
"""
return self.c_sparse_matrix.device()
@property
def row(self) -> torch.Tensor:
"""Returns the row indices of the non-zero elements.
Returns
-------
torch.Tensor
Row indices of the non-zero elements
"""
return self.coo()[0]
@property
def col(self) -> torch.Tensor:
"""Returns the column indices of the non-zero elements.
Returns
-------
torch.Tensor
Column indices of the non-zero elements
"""
return self.coo()[1]
[docs] def coo(self) -> Tuple[torch.Tensor, torch.Tensor]:
r"""Returns the coordinate list (COO) representation of the sparse
matrix.
See `COO in Wikipedia <https://en.wikipedia.org/wiki/
Sparse_matrix#Coordinate_list_(COO)>`_.
Returns
-------
torch.Tensor
Row coordinate
torch.Tensor
Column coordinate
Examples
--------
>>> indices = torch.tensor([[1, 2, 1], [2, 4, 3]])
>>> A = dglsp.spmatrix(indices)
>>> A.coo()
(tensor([1, 2, 1]), tensor([2, 4, 3]))
"""
return self.c_sparse_matrix.coo()
[docs] def indices(self) -> torch.Tensor:
r"""Returns the coordinate list (COO) representation in one tensor with
shape ``(2, nnz)``.
See `COO in Wikipedia <https://en.wikipedia.org/wiki/
Sparse_matrix#Coordinate_list_(COO)>`_.
Returns
-------
torch.Tensor
Stacked COO tensor with shape ``(2, nnz)``.
Examples
--------
>>> indices = torch.tensor([[1, 2, 1], [2, 4, 3]])
>>> A = dglsp.spmatrix(indices)
>>> A.indices()
tensor([[1, 2, 1],
[2, 4, 3]])
"""
return self.c_sparse_matrix.indices()
[docs] def csr(self) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
r"""Returns the compressed sparse row (CSR) representation of the sparse
matrix.
See `CSR in Wikipedia <https://en.wikipedia.org/wiki/
Sparse_matrix#Compressed_sparse_row_(CSR, _CRS_or_Yale_format)>`_.
This function also returns value indices as an index tensor, indicating
the order of the values of non-zero elements in the CSR representation.
A ``None`` value indices array indicates the order of the values stays
the same as the values of the SparseMatrix.
Returns
-------
torch.Tensor
Row indptr
torch.Tensor
Column indices
torch.Tensor
Value indices
Examples
--------
>>> indices = torch.tensor([[1, 2, 1], [2, 4, 3]])
>>> A = dglsp.spmatrix(indices)
>>> A.csr()
(tensor([0, 0, 2, 3]), tensor([2, 3, 4]), tensor([0, 2, 1]))
"""
return self.c_sparse_matrix.csr()
[docs] def csc(self) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
r"""Returns the compressed sparse column (CSC) representation of the
sparse matrix.
See `CSC in Wikipedia <https://en.wikipedia.org/wiki/
Sparse_matrix#Compressed_sparse_column_(CSC_or_CCS)>`_.
This function also returns value indices as an index tensor, indicating
the order of the values of non-zero elements in the CSC representation.
A ``None`` value indices array indicates the order of the values stays
the same as the values of the SparseMatrix.
Returns
-------
torch.Tensor
Column indptr
torch.Tensor
Row indices
torch.Tensor
Value indices
Examples
--------
>>> indices = torch.tensor([[1, 2, 1], [2, 4, 3]])
>>> A = dglsp.spmatrix(indices)
>>> A.csc()
(tensor([0, 0, 0, 1, 2, 3]), tensor([1, 1, 2]), tensor([0, 2, 1]))
"""
return self.c_sparse_matrix.csc()
[docs] def to_dense(self) -> torch.Tensor:
"""Returns a copy in dense matrix format of the sparse matrix.
Returns
-------
torch.Tensor
The copy in dense matrix format
"""
row, col = self.coo()
val = self.val
shape = self.shape + val.shape[1:]
mat = torch.zeros(shape, device=self.device, dtype=self.dtype)
mat[row, col] = val
return mat
[docs] def t(self):
"""Alias of :meth:`transpose()`"""
return self.transpose()
@property
def T(self): # pylint: disable=C0103
"""Alias of :meth:`transpose()`"""
return self.transpose()
[docs] def transpose(self):
"""Returns the transpose of this sparse matrix.
Returns
-------
SparseMatrix
The transpose of this sparse matrix.
Examples
--------
>>> indices = torch.tensor([[1, 1, 3], [2, 1, 3]])
>>> val = torch.tensor([1, 1, 2])
>>> A = dglsp.spmatrix(indices, val)
>>> A = A.transpose()
SparseMatrix(indices=tensor([[2, 1, 3],
[1, 1, 3]]),
values=tensor([1, 1, 2]),
shape=(4, 4), nnz=3)
"""
return SparseMatrix(self.c_sparse_matrix.transpose())
[docs] def to(self, device=None, dtype=None):
"""Performs matrix dtype and/or device conversion. If the target device
and dtype are already in use, the original matrix will be returned.
Parameters
----------
device : torch.device, optional
The target device of the matrix if provided, otherwise the current
device will be used
dtype : torch.dtype, optional
The target data type of the matrix values if provided, otherwise the
current data type will be used
Returns
-------
SparseMatrix
The converted matrix
Examples
--------
>>> indices = torch.tensor([[1, 1, 2], [1, 2, 0]])
>>> A = dglsp.spmatrix(indices, shape=(3, 4))
>>> A.to(device="cuda:0", dtype=torch.int32)
SparseMatrix(indices=tensor([[1, 1, 2],
[1, 2, 0]], device='cuda:0'),
values=tensor([1, 1, 1], device='cuda:0',
dtype=torch.int32),
shape=(3, 4), nnz=3)
"""
if device is None:
device = self.device
if dtype is None:
dtype = self.dtype
if device == self.device and dtype == self.dtype:
return self
elif device == self.device:
return val_like(self, self.val.to(dtype=dtype))
else:
# TODO(#5119): Find a better moving strategy instead of always
# convert to COO format.
row, col = self.coo()
row = row.to(device=device)
col = col.to(device=device)
val = self.val.to(device=device, dtype=dtype)
return from_coo(row, col, val, self.shape)
[docs] def cuda(self):
"""Moves the matrix to GPU. If the matrix is already on GPU, the
original matrix will be returned. If multiple GPU devices exist,
``cuda:0`` will be selected.
Returns
-------
SparseMatrix
The matrix on GPU
Examples
--------
>>> indices = torch.tensor([[1, 1, 2], [1, 2, 0]])
>>> A = dglsp.spmatrix(indices, shape=(3, 4))
>>> A.cuda()
SparseMatrix(indices=tensor([[1, 1, 2],
[1, 2, 0]], device='cuda:0'),
values=tensor([1., 1., 1.], device='cuda:0'),
shape=(3, 4), nnz=3)
"""
return self.to(device="cuda")
[docs] def cpu(self):
"""Moves the matrix to CPU. If the matrix is already on CPU, the
original matrix will be returned.
Returns
-------
SparseMatrix
The matrix on CPU
Examples
--------
>>> indices = torch.tensor([[1, 1, 2], [1, 2, 0]]).to("cuda")
>>> A = dglsp.spmatrix(indices, shape=(3, 4))
>>> A.cpu()
SparseMatrix(indices=tensor([[1, 1, 2],
[1, 2, 0]]),
values=tensor([1., 1., 1.]),
shape=(3, 4), nnz=3)
"""
return self.to(device="cpu")
[docs] def float(self):
"""Converts the matrix values to float32 data type. If the matrix
already uses float data type, the original matrix will be returned.
Returns
-------
SparseMatrix
The matrix with float values
Examples
--------
>>> indices = torch.tensor([[1, 1, 2], [1, 2, 0]])
>>> val = torch.ones(len(row)).long()
>>> A = dglsp.spmatrix(indices, val, shape=(3, 4))
>>> A.float()
SparseMatrix(indices=tensor([[1, 1, 2],
[1, 2, 0]]),
values=tensor([1., 1., 1.]),
shape=(3, 4), nnz=3)
"""
return self.to(dtype=torch.float)
[docs] def double(self):
"""Converts the matrix values to double data type. If the matrix already
uses double data type, the original matrix will be returned.
Returns
-------
SparseMatrix
The matrix with double values
Examples
--------
>>> indices = torch.tensor([[1, 1, 2], [1, 2, 0]])
>>> A = dglsp.spmatrix(indices, shape=(3, 4))
>>> A.double()
SparseMatrix(indices=tensor([[1, 1, 2],
[1, 2, 0]]),
values=tensor([1., 1., 1.], dtype=torch.float64),
shape=(3, 4), nnz=3)
"""
return self.to(dtype=torch.double)
[docs] def int(self):
"""Converts the matrix values to int32 data type. If the matrix already
uses int data type, the original matrix will be returned.
Returns
-------
DiagMatrix
The matrix with int values
Examples
--------
>>> indices = torch.tensor([[1, 1, 2], [1, 2, 0]])
>>> A = dglsp.spmatrix(indices, shape=(3, 4))
>>> A.int()
SparseMatrix(indices=tensor([[1, 1, 2],
[1, 2, 0]]),
values=tensor([1, 1, 1], dtype=torch.int32),
shape=(3, 4), nnz=3)
"""
return self.to(dtype=torch.int)
[docs] def long(self):
"""Converts the matrix values to long data type. If the matrix already
uses long data type, the original matrix will be returned.
Returns
-------
DiagMatrix
The matrix with long values
Examples
--------
>>> indices = torch.tensor([[1, 1, 2], [1, 2, 0]])
>>> A = dglsp.spmatrix(indices, shape=(3, 4))
>>> A.long()
SparseMatrix(indices=tensor([[1, 1, 2],
[1, 2, 0]]),
values=tensor([1, 1, 1]),
shape=(3, 4), nnz=3)
"""
return self.to(dtype=torch.long)
[docs] def coalesce(self):
"""Returns a coalesced sparse matrix.
A coalesced sparse matrix satisfies the following properties:
- the indices of the non-zero elements are unique,
- the indices are sorted in lexicographical order.
The coalescing process will accumulate the non-zero elements of the same
indices by summation.
The function does not support autograd.
Returns
-------
SparseMatrix
The coalesced sparse matrix
Examples
--------
>>> indices = torch.tensor([[1, 0, 0, 0, 1], [1, 1, 1, 2, 2]])
>>> val = torch.tensor([0, 1, 2, 3, 4])
>>> A = dglsp.spmatrix(indices, val)
>>> A.coalesce()
SparseMatrix(indices=tensor([[0, 0, 1, 1],
[1, 2, 1, 2]]),
values=tensor([3, 3, 0, 4]),
shape=(2, 3), nnz=4)
"""
return SparseMatrix(self.c_sparse_matrix.coalesce())
[docs] def has_duplicate(self):
"""Returns ``True`` if the sparse matrix contains duplicate indices.
Examples
--------
>>> indices = torch.tensor([[1, 0, 0, 0, 1], [1, 1, 1, 2, 2]])
>>> val = torch.tensor([0, 1, 2, 3, 4])
>>> A = dglsp.spmatrix(indices, val)
>>> A.has_duplicate()
True
>>> A.coalesce().has_duplicate()
False
"""
return self.c_sparse_matrix.has_duplicate()
def is_diag(self):
"""Returns whether the sparse matrix is a diagonal matrix."""
return self.c_sparse_matrix.is_diag()
[docs]def spmatrix(
indices: torch.Tensor,
val: Optional[torch.Tensor] = None,
shape: Optional[Tuple[int, int]] = None,
) -> SparseMatrix:
r"""Creates a sparse matrix from Coordinate format indices.
Parameters
----------
indices : tensor.Tensor
The indices are the coordinates of the non-zero elements in the matrix,
which should have shape of ``(2, N)`` where the first row is the row
indices and the second row is the column indices of non-zero elements.
val : tensor.Tensor, optional
The values of shape ``(nnz)`` or ``(nnz, D)``. If None, it will be a
tensor of shape ``(nnz)`` filled by 1.
shape : tuple[int, int], optional
If not specified, it will be inferred from :attr:`row` and :attr:`col`,
i.e., ``(row.max() + 1, col.max() + 1)``. Otherwise, :attr:`shape`
should be no smaller than this.
Returns
-------
SparseMatrix
Sparse matrix
Examples
--------
Case1: Sparse matrix with row and column indices without values.
>>> indices = torch.tensor([[1, 1, 2], [2, 4, 3]])
>>> A = dglsp.spmatrix(indices)
SparseMatrix(indices=tensor([[1, 1, 2],
[2, 4, 3]]),
values=tensor([1., 1., 1.]),
shape=(3, 5), nnz=3)
>>> # Specify shape
>>> A = dglsp.spmatrix(indices, shape=(5, 5))
SparseMatrix(indices=tensor([[1, 1, 2],
[2, 4, 3]]),
values=tensor([1., 1., 1.]),
shape=(5, 5), nnz=3)
Case2: Sparse matrix with scalar values.
>>> indices = torch.tensor([[1, 1, 2], [2, 4, 3]])
>>> val = torch.tensor([[1.], [2.], [3.]])
>>> A = dglsp.spmatrix(indices, val)
SparseMatrix(indices=tensor([[1, 1, 2],
[2, 4, 3]]),
values=tensor([[1.],
[2.],
[3.]]),
shape=(3, 5), nnz=3, val_size=(1,))
Case3: Sparse matrix with vector values.
>>> indices = torch.tensor([[1, 1, 2], [2, 4, 3]])
>>> val = torch.tensor([[1., 1.], [2., 2.], [3., 3.]])
>>> A = dglsp.spmatrix(indices, val)
SparseMatrix(indices=tensor([[1, 1, 2],
[2, 4, 3]]),
values=tensor([[1., 1.],
[2., 2.],
[3., 3.]]),
shape=(3, 5), nnz=3, val_size=(2,))
"""
if shape is None:
shape = (
torch.max(indices[0]).item() + 1,
torch.max(indices[1]).item() + 1,
)
if val is None:
val = torch.ones(indices.shape[1]).to(indices.device)
assert (
val.dim() <= 2
), "The values of a SparseMatrix can only be scalars or vectors."
return SparseMatrix(torch.ops.dgl_sparse.from_coo(indices, val, shape))
[docs]def from_coo(
row: torch.Tensor,
col: torch.Tensor,
val: Optional[torch.Tensor] = None,
shape: Optional[Tuple[int, int]] = None,
) -> SparseMatrix:
r"""Creates a sparse matrix from a coordinate list (COO), which stores a list
of (row, column, value) tuples.
See `COO in Wikipedia
<https://en.wikipedia.org/wiki/Sparse_matrix#Coordinate_list_(COO)>`_.
Parameters
----------
row : torch.Tensor
The row indices of shape ``(nnz)``
col : torch.Tensor
The column indices of shape ``(nnz)``
val : torch.Tensor, optional
The values of shape ``(nnz)`` or ``(nnz, D)``. If None, it will be a
tensor of shape ``(nnz)`` filled by 1.
shape : tuple[int, int], optional
If not specified, it will be inferred from :attr:`row` and :attr:`col`,
i.e., ``(row.max() + 1, col.max() + 1)``. Otherwise, :attr:`shape`
should be no smaller than this.
Returns
-------
SparseMatrix
Sparse matrix
Examples
--------
Case1: Sparse matrix with row and column indices without values.
>>> dst = torch.tensor([1, 1, 2])
>>> src = torch.tensor([2, 4, 3])
>>> A = dglsp.from_coo(dst, src)
SparseMatrix(indices=tensor([[1, 1, 2],
[2, 4, 3]]),
values=tensor([1., 1., 1.]),
shape=(3, 5), nnz=3)
>>> # Specify shape
>>> A = dglsp.from_coo(dst, src, shape=(5, 5))
SparseMatrix(indices=tensor([[1, 1, 2],
[2, 4, 3]]),
values=tensor([1., 1., 1.]),
shape=(5, 5), nnz=3)
Case2: Sparse matrix with scalar values.
>>> indices = torch.tensor([[1, 1, 2], [2, 4, 3]])
>>> val = torch.tensor([[1.], [2.], [3.]])
>>> A = dglsp.spmatrix(indices, val)
SparseMatrix(indices=tensor([[1, 1, 2],
[2, 4, 3]]),
values=tensor([[1.],
[2.],
[3.]]),
shape=(3, 5), nnz=3, val_size=(1,))
Case3: Sparse matrix with vector values.
>>> dst = torch.tensor([1, 1, 2])
>>> src = torch.tensor([2, 4, 3])
>>> val = torch.tensor([[1., 1.], [2., 2.], [3., 3.]])
>>> A = dglsp.from_coo(dst, src, val)
SparseMatrix(indices=tensor([[1, 1, 2],
[2, 4, 3]]),
values=tensor([[1., 1.],
[2., 2.],
[3., 3.]]),
shape=(3, 5), nnz=3, val_size=(2,))
"""
assert row.shape[0] == col.shape[0]
return spmatrix(torch.stack([row, col]), val, shape)
[docs]def from_csr(
indptr: torch.Tensor,
indices: torch.Tensor,
val: Optional[torch.Tensor] = None,
shape: Optional[Tuple[int, int]] = None,
) -> SparseMatrix:
r"""Creates a sparse matrix from compress sparse row (CSR) format.
See `CSR in Wikipedia <https://en.wikipedia.org/wiki/
Sparse_matrix#Compressed_sparse_row_(CSR,_CRS_or_Yale_format)>`_.
For row i of the sparse matrix
- the column indices of the non-zero elements are stored in
``indices[indptr[i]: indptr[i+1]]``
- the corresponding values are stored in ``val[indptr[i]: indptr[i+1]]``
Parameters
----------
indptr : torch.Tensor
Pointer to the column indices of shape ``(N + 1)``, where ``N`` is the
number of rows
indices : torch.Tensor
The column indices of shape ``(nnz)``
val : torch.Tensor, optional
The values of shape ``(nnz)`` or ``(nnz, D)``. If None, it will be a
tensor of shape ``(nnz)`` filled by 1.
shape : tuple[int, int], optional
If not specified, it will be inferred from :attr:`indptr` and
:attr:`indices`, i.e., ``(len(indptr) - 1, indices.max() + 1)``.
Otherwise, :attr:`shape` should be no smaller than this.
Returns
-------
SparseMatrix
Sparse matrix
Examples
--------
Case1: Sparse matrix without values
.. code::
[[0, 1, 0],
[0, 0, 1],
[1, 1, 1]]
>>> indptr = torch.tensor([0, 1, 2, 5])
>>> indices = torch.tensor([1, 2, 0, 1, 2])
>>> A = dglsp.from_csr(indptr, indices)
SparseMatrix(indices=tensor([[0, 1, 2, 2, 2],
[1, 2, 0, 1, 2]]),
values=tensor([1., 1., 1., 1., 1.]),
shape=(3, 3), nnz=5)
>>> # Specify shape
>>> A = dglsp.from_csr(indptr, indices, shape=(3, 5))
SparseMatrix(indices=tensor([[0, 1, 2, 2, 2],
[1, 2, 0, 1, 2]]),
values=tensor([1., 1., 1., 1., 1.]),
shape=(3, 5), nnz=5)
Case2: Sparse matrix with scalar/vector values. Following example is with
vector data.
>>> indptr = torch.tensor([0, 1, 2, 5])
>>> indices = torch.tensor([1, 2, 0, 1, 2])
>>> val = torch.tensor([[1, 1], [2, 2], [3, 3], [4, 4], [5, 5]])
>>> A = dglsp.from_csr(indptr, indices, val)
SparseMatrix(indices=tensor([[0, 1, 2, 2, 2],
[1, 2, 0, 1, 2]]),
values=tensor([[1, 1],
[2, 2],
[3, 3],
[4, 4],
[5, 5]]),
shape=(3, 3), nnz=5, val_size=(2,))
"""
if shape is None:
shape = (indptr.shape[0] - 1, torch.max(indices) + 1)
if val is None:
val = torch.ones(indices.shape[0]).to(indptr.device)
assert (
val.dim() <= 2
), "The values of a SparseMatrix can only be scalars or vectors."
return SparseMatrix(
torch.ops.dgl_sparse.from_csr(indptr, indices, val, shape)
)
[docs]def from_csc(
indptr: torch.Tensor,
indices: torch.Tensor,
val: Optional[torch.Tensor] = None,
shape: Optional[Tuple[int, int]] = None,
) -> SparseMatrix:
r"""Creates a sparse matrix from compress sparse column (CSC) format.
See `CSC in Wikipedia <https://en.wikipedia.org/wiki/
Sparse_matrix#Compressed_sparse_column_(CSC_or_CCS)>`_.
For column i of the sparse matrix
- the row indices of the non-zero elements are stored in
``indices[indptr[i]: indptr[i+1]]``
- the corresponding values are stored in ``val[indptr[i]: indptr[i+1]]``
Parameters
----------
indptr : torch.Tensor
Pointer to the row indices of shape N + 1, where N is the
number of columns
indices : torch.Tensor
The row indices of shape nnz
val : torch.Tensor, optional
The values of shape ``(nnz)`` or ``(nnz, D)``. If None, it will be a
tensor of shape ``(nnz)`` filled by 1.
shape : tuple[int, int], optional
If not specified, it will be inferred from :attr:`indptr` and
:attr:`indices`, i.e., ``(indices.max() + 1, len(indptr) - 1)``.
Otherwise, :attr:`shape` should be no smaller than this.
Returns
-------
SparseMatrix
Sparse matrix
Examples
--------
Case1: Sparse matrix without values
.. code::
[[0, 1, 0],
[0, 0, 1],
[1, 1, 1]]
>>> indptr = torch.tensor([0, 1, 3, 5])
>>> indices = torch.tensor([2, 0, 2, 1, 2])
>>> A = dglsp.from_csc(indptr, indices)
SparseMatrix(indices=tensor([[2, 0, 2, 1, 2],
[0, 1, 1, 2, 2]]),
values=tensor([1., 1., 1., 1., 1.]),
shape=(3, 3), nnz=5)
>>> # Specify shape
>>> A = dglsp.from_csc(indptr, indices, shape=(5, 3))
SparseMatrix(indices=tensor([[2, 0, 2, 1, 2],
[0, 1, 1, 2, 2]]),
values=tensor([1., 1., 1., 1., 1.]),
shape=(5, 3), nnz=5)
Case2: Sparse matrix with scalar/vector values. Following example is with
vector data.
>>> indptr = torch.tensor([0, 1, 3, 5])
>>> indices = torch.tensor([2, 0, 2, 1, 2])
>>> val = torch.tensor([[1, 1], [2, 2], [3, 3], [4, 4], [5, 5]])
>>> A = dglsp.from_csc(indptr, indices, val)
SparseMatrix(indices=tensor([[2, 0, 2, 1, 2],
[0, 1, 1, 2, 2]]),
values=tensor([[1, 1],
[2, 2],
[3, 3],
[4, 4],
[5, 5]]),
shape=(3, 3), nnz=5, val_size=(2,))
"""
if shape is None:
shape = (torch.max(indices) + 1, indptr.shape[0] - 1)
if val is None:
val = torch.ones(indices.shape[0]).to(indptr.device)
assert (
val.dim() <= 2
), "The values of a SparseMatrix can only be scalars or vectors."
return SparseMatrix(
torch.ops.dgl_sparse.from_csc(indptr, indices, val, shape)
)
[docs]def val_like(mat: SparseMatrix, val: torch.Tensor) -> SparseMatrix:
"""Creates a sparse matrix from an existing sparse matrix using new values.
The new sparse matrix will have the same non-zero indices as the given
sparse matrix and use the given values as the new non-zero values.
Parameters
----------
mat : SparseMatrix
An existing sparse matrix with non-zero values
val : torch.Tensor
The new values of the non-zero elements, a tensor of shape ``(nnz)`` or
``(nnz, D)``
Returns
-------
SparseMatrix
New sparse matrix
Examples
--------
>>> indices = torch.tensor([[1, 1, 2], [2, 4, 3]])
>>> val = torch.ones(3)
>>> A = dglsp.spmatrix(indices, val)
>>> A = dglsp.val_like(A, torch.tensor([2, 2, 2]))
SparseMatrix(indices=tensor([[1, 1, 2],
[2, 4, 3]]),
values=tensor([2, 2, 2]),
shape=(3, 5), nnz=3)
"""
assert (
val.dim() <= 2
), "The values of a SparseMatrix can only be scalars or vectors."
return SparseMatrix(torch.ops.dgl_sparse.val_like(mat.c_sparse_matrix, val))
[docs]def diag(
val: torch.Tensor, shape: Optional[Tuple[int, int]] = None
) -> SparseMatrix:
"""Creates a sparse matrix based on the diagonal values.
Parameters
----------
val : torch.Tensor
Diagonal of the matrix, in shape ``(N)`` or ``(N, D)``
shape : tuple[int, int], optional
If specified, :attr:`len(val)` must be equal to :attr:`min(shape)`,
otherwise, it will be inferred from :attr:`val`, i.e., ``(N, N)``
Returns
-------
SparseMatrix
Sparse matrix
Examples
--------
Case1: 5-by-5 diagonal matrix with scaler values on the diagonal
>>> import torch
>>> val = torch.ones(5)
>>> dglsp.diag(val)
SparseMatrix(indices=tensor([[0, 1, 2, 3, 4],
[0, 1, 2, 3, 4]]),
values=tensor([1., 1., 1., 1., 1.]),
shape=(5, 5), nnz=5)
Case2: 5-by-10 diagonal matrix with scaler values on the diagonal
>>> val = torch.ones(5)
>>> dglsp.diag(val, shape=(5, 10))
SparseMatrix(indices=tensor([[0, 1, 2, 3, 4],
[0, 1, 2, 3, 4]]),
values=tensor([1., 1., 1., 1., 1.]),
shape=(5, 10), nnz=5)
Case3: 5-by-5 diagonal matrix with vector values on the diagonal
>>> val = torch.randn(5, 3)
>>> D = dglsp.diag(val)
>>> D.shape
(5, 5)
>>> D.nnz
5
"""
assert (
val.dim() <= 2
), "The values of a DiagMatrix can only be scalars or vectors."
len_val = len(val)
if shape is not None:
assert len_val == min(shape), (
f"Expect len(val) to be min(shape) for a diagonal matrix, got"
f"{len_val} for len(val) and {shape} for shape."
)
else:
shape = (len_val, len_val)
return SparseMatrix(torch.ops.dgl_sparse.from_diag(val, shape))
[docs]def identity(
shape: Tuple[int, int],
d: Optional[int] = None,
dtype: Optional[torch.dtype] = None,
device: Optional[torch.device] = None,
) -> SparseMatrix:
r"""Creates a sparse matrix with ones on the diagonal and zeros elsewhere.
Parameters
----------
shape : tuple[int, int]
Shape of the matrix.
d : int, optional
If None, the diagonal entries will be scaler 1. Otherwise, the diagonal
entries will be a 1-valued tensor of shape ``(d)``.
dtype : torch.dtype, optional
The data type of the matrix
device : torch.device, optional
The device of the matrix
Returns
-------
SparseMatrix
Sparse matrix
Examples
--------
Case1: 3-by-3 matrix with scaler diagonal values
.. code::
[[1, 0, 0],
[0, 1, 0],
[0, 0, 1]]
>>> dglsp.identity(shape=(3, 3))
SparseMatrix(indices=tensor([[0, 1, 2],
[0, 1, 2]]),
values=tensor([1., 1., 1.]),
shape=(3, 3), nnz=3)
Case2: 3-by-5 matrix with scaler diagonal values
.. code::
[[1, 0, 0, 0, 0],
[0, 1, 0, 0, 0],
[0, 0, 1, 0, 0]]
>>> dglsp.identity(shape=(3, 5))
SparseMatrix(indices=tensor([[0, 1, 2],
[0, 1, 2]]),
values=tensor([1., 1., 1.]),
shape=(3, 5), nnz=3)
Case3: 3-by-3 matrix with vector diagonal values
>>> dglsp.identity(shape=(3, 3), d=2)
SparseMatrix(indices=tensor([[0, 1, 2],
[0, 1, 2]]),
values=tensor([[1., 1.],
[1., 1.],
[1., 1.]]),
shape=(3, 3), nnz=3, val_size=(2,))
"""
len_val = min(shape)
if d is None:
val_shape = (len_val,)
else:
val_shape = (len_val, d)
val = torch.ones(val_shape, dtype=dtype, device=device)
return diag(val, shape)
def from_torch_sparse(torch_sparse_tensor: torch.Tensor) -> SparseMatrix:
"""Creates a sparse matrix from a torch sparse tensor, which can have coo,
csr, or csc layout.
Parameters
----------
torch_sparse_tensor : torch.Tensor
Torch sparse tensor
Returns
-------
SparseMatrix
Sparse matrix
Examples
--------
>>> indices = torch.tensor([[1, 1, 2], [2, 4, 3]])
>>> val = torch.ones(3)
>>> torch_coo = torch.sparse_coo_tensor(indices, val)
>>> dglsp.from_torch_sparse(torch_coo)
SparseMatrix(indices=tensor([[1, 1, 2],
[2, 4, 3]]),
values=tensor([1., 1., 1.]),
shape=(3, 5), nnz=3)
"""
assert torch_sparse_tensor.layout in (
torch.sparse_coo,
torch.sparse_csr,
torch.sparse_csc,
), (
f"Cannot convert Pytorch sparse tensor with layout "
f"{torch_sparse_tensor.layout} to DGL sparse."
)
if torch_sparse_tensor.layout == torch.sparse_coo:
# Use ._indices() and ._values() to access uncoalesced indices and
# values.
return spmatrix(
torch_sparse_tensor._indices(),
torch_sparse_tensor._values(),
torch_sparse_tensor.shape[:2],
)
elif torch_sparse_tensor.layout == torch.sparse_csr:
return from_csr(
torch_sparse_tensor.crow_indices(),
torch_sparse_tensor.col_indices(),
torch_sparse_tensor.values(),
torch_sparse_tensor.shape[:2],
)
else:
return from_csc(
torch_sparse_tensor.ccol_indices(),
torch_sparse_tensor.row_indices(),
torch_sparse_tensor.values(),
torch_sparse_tensor.shape[:2],
)
def to_torch_sparse_coo(spmat: SparseMatrix) -> torch.Tensor:
"""Creates a torch sparse coo tensor from a sparse matrix.
Parameters
----------
spmat : SparseMatrix
Sparse matrix
Returns
-------
torch.Tensor
torch tensor with torch.sparse_coo layout
Examples
--------
>>> indices = torch.tensor([[1, 1, 2], [2, 4, 3]])
>>> val = torch.ones(3)
>>> spmat = dglsp.spmatrix(indices, val)
>>> dglsp.to_torch_sparse_coo(spmat)
tensor(indices=tensor([[1, 1, 2],
[2, 4, 3]]),
values=tensor([1., 1., 1.]),
size=(3, 5), nnz=3, layout=torch.sparse_coo)
"""
shape = spmat.shape
if spmat.val.dim() > 1:
shape += spmat.val.shape[1:]
return torch.sparse_coo_tensor(spmat.indices(), spmat.val, shape)
def to_torch_sparse_csr(spmat: SparseMatrix) -> torch.Tensor:
"""Creates a torch sparse csr tensor from a sparse matrix.
Note that converting a sparse matrix to torch csr tensor could change the
order of non-zero values.
Parameters
----------
spmat : SparseMatrix
Sparse matrix
Returns
-------
torch.Tensor
Torch tensor with torch.sparse_csr layout
Examples
--------
>>> indices = torch.tensor([[1, 2, 1], [2, 4, 3]])
>>> val = torch.arange(3)
>>> spmat = dglsp.spmatrix(indices, val)
>>> dglsp.to_torch_sparse_csr(spmat)
tensor(crow_indices=tensor([0, 0, 2, 3]),
col_indices=tensor([2, 3, 4]),
values=tensor([0, 2, 1]), size=(3, 5), nnz=3,
layout=torch.sparse_csr)
"""
shape = spmat.shape
if spmat.val.dim() > 1:
shape += spmat.val.shape[1:]
indptr, indices, value_indices = spmat.csr()
val = spmat.val
if value_indices is not None:
val = val[value_indices]
return torch.sparse_csr_tensor(indptr, indices, val, shape)
def to_torch_sparse_csc(spmat: SparseMatrix) -> torch.Tensor:
"""Creates a torch sparse csc tensor from a sparse matrix.
Note that converting a sparse matrix to torch csc tensor could change the
order of non-zero values.
Parameters
----------
spmat : SparseMatrix
Sparse matrix
Returns
-------
torch.Tensor
Torch tensor with torch.sparse_csc layout
Examples
--------
>>> indices = torch.tensor([[1, 2, 1], [2, 4, 3]])
>>> val = torch.arange(3)
>>> spmat = dglsp.spmatrix(indices, val)
>>> dglsp.to_torch_sparse_csc(spmat)
tensor(ccol_indices=tensor([0, 0, 0, 1, 2, 3]),
row_indices=tensor([1, 1, 2]),
values=tensor([0, 2, 1]), size=(3, 5), nnz=3,
layout=torch.sparse_csc)
"""
shape = spmat.shape
if spmat.val.dim() > 1:
shape += spmat.val.shape[1:]
indptr, indices, value_indices = spmat.csc()
val = spmat.val
if value_indices is not None:
val = val[value_indices]
return torch.sparse_csc_tensor(indptr, indices, val, shape)
def _sparse_matrix_str(spmat: SparseMatrix) -> str:
"""Internal function for converting a sparse matrix to string
representation.
"""
indices_str = str(torch.stack(spmat.coo()))
values_str = str(spmat.val)
meta_str = f"shape={spmat.shape}, nnz={spmat.nnz}"
if spmat.val.dim() > 1:
val_size = tuple(spmat.val.shape[1:])
meta_str += f", val_size={val_size}"
prefix = f"{type(spmat).__name__}("
def _add_indent(_str, indent):
lines = _str.split("\n")
lines = [lines[0]] + [" " * indent + line for line in lines[1:]]
return "\n".join(lines)
final_str = (
"indices="
+ _add_indent(indices_str, len("indices="))
+ ",\n"
+ "values="
+ _add_indent(values_str, len("values="))
+ ",\n"
+ meta_str
+ ")"
)
final_str = prefix + _add_indent(final_str, len(prefix))
return final_str