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#######################################################
# Copyright (c) 2019, ArrayFire
# All rights reserved.
#
# This file is distributed under 3-clause BSD license.
# The complete license agreement can be obtained at:
# http://arrayfire.com/licenses/BSD-3-Clause
########################################################
"""
Functions to create and manipulate sparse matrices.
"""
from .array import Array
from .library import backend, safe_call, STORAGE, Dtype, c_dim_t, c_int_t, c_pointer
from .interop import to_array
__to_sparse_enum = [
STORAGE.DENSE,
STORAGE.CSR,
STORAGE.CSC,
STORAGE.COO]
def create_sparse(values, row_idx, col_idx, nrows, ncols, storage=STORAGE.CSR):
"""
Create a sparse matrix from it's constituent parts.
Parameters
----------
values : af.Array.
- Contains the non zero elements of the sparse array.
row_idx : af.Array.
- Contains row indices of the sparse array.
col_idx : af.Array.
- Contains column indices of the sparse array.
nrows : int.
- specifies the number of rows in sparse matrix.
ncols : int.
- specifies the number of columns in sparse matrix.
storage : optional: arrayfire.STORAGE. default: arrayfire.STORAGE.CSR.
- Can be one of arrayfire.STORAGE.CSR, arrayfire.STORAGE.COO.
Returns
-------
A sparse matrix.
"""
assert isinstance(values, Array)
assert isinstance(row_idx, Array)
assert isinstance(col_idx, Array)
out = Array()
safe_call(backend.get().af_create_sparse_array(
c_pointer(out.arr), c_dim_t(nrows), c_dim_t(ncols), values.arr, row_idx.arr, col_idx.arr, storage.value))
return out
def create_sparse_from_host(values, row_idx, col_idx, nrows, ncols, storage=STORAGE.CSR):
"""
Create a sparse matrix from it's constituent parts.
Parameters
----------
values : Any datatype that can be converted to array.
- Contains the non zero elements of the sparse array.
row_idx : Any datatype that can be converted to array.
- Contains row indices of the sparse array.
col_idx : Any datatype that can be converted to array.
- Contains column indices of the sparse array.
nrows : int.
- specifies the number of rows in sparse matrix.
ncols : int.
- specifies the number of columns in sparse matrix.
storage : optional: arrayfire.STORAGE. default: arrayfire.STORAGE.CSR.
- Can be one of arrayfire.STORAGE.CSR, arrayfire.STORAGE.COO.
Returns
-------
A sparse matrix.
"""
return create_sparse(
to_array(values), to_array(row_idx).as_type(Dtype.s32), to_array(col_idx).as_type(Dtype.s32), nrows, ncols,
storage)
def create_sparse_from_dense(dense, storage=STORAGE.CSR):
"""
Create a sparse matrix from a dense matrix.
Parameters
----------
dense : af.Array.
- A dense matrix.
storage : optional: arrayfire.STORAGE. default: arrayfire.STORAGE.CSR.
- Can be one of arrayfire.STORAGE.CSR, arrayfire.STORAGE.COO.
Returns
-------
A sparse matrix.
"""
assert isinstance(dense, Array)
out = Array()
safe_call(backend.get().af_create_sparse_array_from_dense(c_pointer(out.arr), dense.arr, storage.value))
return out
def convert_sparse_to_dense(sparse):
"""
Create a dense matrix from a sparse matrix.
Parameters
----------
sparse : af.Array.
- A sparse matrix.
Returns
-------
A dense matrix.
"""
out = Array()
safe_call(backend.get().af_sparse_to_dense(c_pointer(out.arr), sparse.arr))
return out
def sparse_get_info(sparse):
"""
Get the constituent arrays and storage info from a sparse matrix.
Parameters
----------
sparse : af.Array.
- A sparse matrix.
Returns
--------
(values, row_idx, col_idx, storage) where
values : arrayfire.Array containing non zero elements from sparse matrix
row_idx : arrayfire.Array containing the row indices
col_idx : arrayfire.Array containing the column indices
storage : sparse storage
"""
values = Array()
row_idx = Array()
col_idx = Array()
stype = c_int_t(0)
safe_call(backend.get().af_sparse_get_info(
c_pointer(values.arr), c_pointer(row_idx.arr), c_pointer(col_idx.arr), c_pointer(stype), sparse.arr))
return (values, row_idx, col_idx, __to_sparse_enum[stype.value])
def sparse_get_values(sparse):
"""
Get the non zero values from sparse matrix.
Parameters
----------
sparse : af.Array.
- A sparse matrix.
Returns
--------
arrayfire array containing the non zero elements.
"""
values = Array()
safe_call(backend.get().af_sparse_get_values(c_pointer(values.arr), sparse.arr))
return values
def sparse_get_row_idx(sparse):
"""
Get the row indices from sparse matrix.
Parameters
----------
sparse : af.Array.
- A sparse matrix.
Returns
--------
arrayfire array containing the non zero elements.
"""
row_idx = Array()
safe_call(backend.get().af_sparse_get_row_idx(c_pointer(row_idx.arr), sparse.arr))
return row_idx
def sparse_get_col_idx(sparse):
"""
Get the column indices from sparse matrix.
Parameters
----------
sparse : af.Array.
- A sparse matrix.
Returns
--------
arrayfire array containing the non zero elements.
"""
col_idx = Array()
safe_call(backend.get().af_sparse_get_col_idx(c_pointer(col_idx.arr), sparse.arr))
return col_idx
def sparse_get_nnz(sparse):
"""
Get the column indices from sparse matrix.
Parameters
----------
sparse : af.Array.
- A sparse matrix.
Returns
--------
Number of non zero elements in the sparse matrix.
"""
nnz = c_dim_t(0)
safe_call(backend.get().af_sparse_get_nnz(c_pointer(nnz), sparse.arr))
return nnz.value
def sparse_get_storage(sparse):
"""
Get the column indices from sparse matrix.
Parameters
----------
sparse : af.Array.
- A sparse matrix.
Returns
--------
Number of non zero elements in the sparse matrix.
"""
storage = c_int_t(0)
safe_call(backend.get().af_sparse_get_storage(c_pointer(storage), sparse.arr))
return __to_sparse_enum[storage.value]
def convert_sparse(sparse, storage):
"""
Convert sparse matrix from one format to another.
Parameters
----------
storage : arrayfire.STORAGE.
Returns
-------
Sparse matrix converted to the appropriate type.
"""
out = Array()
safe_call(backend.get().af_sparse_convert_to(c_pointer(out.arr), sparse.arr, storage.value))
return out