def cscsort(x):
"""Sorts indices of CSC-matrix in place.
Args:
x (cupyx.scipy.sparse.csc_matrix): A sparse matrix to sort.
"""
if not check_availability('cscsort'):
raise RuntimeError('cscsort is not available.')
nnz = x.nnz
if nnz == 0:
return
handle = device.get_cusparse_handle()
m, n = x.shape
buffer_size = cusparse.xcscsort_bufferSizeExt(
handle, m, n, nnz, x.indptr.data.ptr,
x.indices.data.ptr)
buf = cupy.empty(buffer_size, 'b')
P = cupy.empty(nnz, 'i')
data_orig = x.data.copy()
cusparse.createIdentityPermutation(handle, nnz, P.data.ptr)
cusparse.xcscsort(
handle, m, n, nnz, x._descr.descriptor, x.indptr.data.ptr,
x.indices.data.ptr, P.data.ptr, buf.data.ptr)
_call_cusparse(
'gthr', x.dtype,
handle, nnz, data_orig.data.ptr, x.data.data.ptr,
P.data.ptr, cusparse.CUSPARSE_INDEX_BASE_ZERO)
def coosort(x, sort_by='r'):
"""Sorts indices of COO-matrix in place.
Args:
x (cupyx.scipy.sparse.coo_matrix): A sparse matrix to sort.
sort_by (str): Sort the indices by row ('r', default) or column ('c').
"""
if not check_availability('coosort'):
raise RuntimeError('coosort is not available.')
nnz = x.nnz
if nnz == 0:
return
handle = device.get_cusparse_handle()
m, n = x.shape
buffer_size = cusparse.xcoosort_bufferSizeExt(
handle, m, n, nnz, x.row.data.ptr, x.col.data.ptr)
buf = cupy.empty(buffer_size, 'b')
P = cupy.empty(nnz, 'i')
data_orig = x.data.copy()
cusparse.createIdentityPermutation(handle, nnz, P.data.ptr)
if sort_by == 'r':
cusparse.xcoosortByRow(
handle, m, n, nnz, x.row.data.ptr, x.col.data.ptr,
P.data.ptr, buf.data.ptr)
elif sort_by == 'c':
cusparse.xcoosortByColumn(
handle, m, n, nnz, x.row.data.ptr, x.col.data.ptr,
P.data.ptr, buf.data.ptr)
else:
raise ValueError("sort_by must be either 'r' or 'c'")
_call_cusparse(
'gthr', x.dtype,
handle, nnz, data_orig.data.ptr, x.data.data.ptr,
P.data.ptr, cusparse.CUSPARSE_INDEX_BASE_ZERO)
if sort_by == 'c': # coo is sorted by row first
x._has_canonical_format = False