def _symbolic(self, A):
"""
Return the symbolic factorization of sparse matrix ``A``.
Parameters
----------
A
Sparse matrix to be factorized.
Returns
-------
A C-object of the symbolic factorization.
"""
if self.sparselib == 'umfpack':
return umfpack.symbolic(A)
elif self.sparselib == 'klu':
return klu.symbolic(A)
elif self.sparselib in ('spsolve', 'cupy'):
raise NotImplementedError
def _symbolic(self, A):
return klu.symbolic(A)