def extend_hierarchy(levels, CF, l, maxp, theta_a, keep):
"""Extend the multigrid hierarchy."""
def unpack_arg(v):
if isinstance(v, tuple):
return v[0], v[1]
else:
return v, {}
A = levels[-1].A
# Generate the C/F splitting
fn, kwargs = unpack_arg(CF)
if fn == 'CR':
splitting = CR(A, **kwargs)
else:
raise ValueError('unknown C/F splitting method (%s)' % CF)
# rs_C = classical_strength_of_connection(A, theta=0.25)
# rs_splitting = split.RS(rs_C)
# rs_P = direct_interpolation(A.copy(), rs_C.copy(), rs_splitting.copy())
#
# rs_P_sparsity = rs_P.copy()
# rs_P_sparsity.data[:] = 1
#
# rs_fine = np.where(rs_splitting == 0)[0]
# rs_coarse = np.where(rs_splitting == 1)[0]
# rs_A_fc = A[rs_fine][:, rs_coarse]
# rs_W = rs_P[rs_fine]
# my_rs_P, my_rs_W = my_direct_interpolation(rs_A_fc, A, rs_W, rs_coarse, rs_fine)
#
# my_rs_P_sparsity = my_rs_P.copy()
# my_rs_P_sparsity.data[:] = 1
#
# rs_A_sparsity = A[:, rs_coarse].copy()
# rs_A_sparsity.data[:] = 1
# Generate the interpolation matrix that maps from the coarse-grid to the
# fine-grid
P = truncation_interpolation(A, splitting, l, maxp, theta_a)
# P = optimal_interpolation(A, splitting)
# P = rs_P
# Generate the restriction matrix that maps from the fine-grid to the
# coarse-grid
R = P.T.tocsr()
# Store relevant information for this level
if keep:
levels[-1].splitting = splitting # C/F splitting
levels[-1].P = P # prolongation operator
levels[-1].R = R # restriction operator
levels.append(multilevel_solver.level())
# Form next level through Galerkin product
A = R * A * P
levels[-1].A = A
def test_cr(self):
A = self.cases[6]
# 1d-tests, should be alternating aggregates
# (n-1)/2 < = sum <= (n+1)/2.
# Test auto thetacs and set thetacs values
for i in range(3, 10):
A = self.cases[i]
h_split_auto = CR(A, method='habituated', thetacr=0.7,
thetacs='auto')
assert(h_split_auto.sum() <= (h_split_auto.shape[0]+1)/2)
assert(h_split_auto.sum() >= (h_split_auto.shape[0]-1)/2)
c_split_auto = CR(A, method='concurrent', thetacr=0.7,
thetacs='auto')
assert(c_split_auto.sum() <= (c_split_auto.shape[0]+1)/2)
assert(c_split_auto.sum() >= (c_split_auto.shape[0]-1)/2)
h_split = CR(A, method='habituated', thetacr=0.7,
thetacs=[0.3, 0.5])
assert(h_split.sum() <= (h_split.shape[0]+1)/2)
assert(h_split.sum() >= (h_split.shape[0]-1)/2)
c_split = CR(A, method='concurrent', thetacr=0.7,
thetacs=[0.3, 0.5])
assert(c_split.sum() <= (c_split.shape[0]+1)/2)
assert(c_split.sum() >= (c_split.shape[0]-1)/2)
# 2d-tests. CR is a little more picky with parameters and relaxation
# type in 2d. Can still bound above by (n+1)/2.
# Need looser lower bound,
# say (n+1)/4.
for i in range(10, 15):
A = self.cases[i]
h_split_auto = CR(A, method='habituated', thetacr=0.7,
thetacs='auto')
assert(h_split_auto.sum() <= (h_split_auto.shape[0]+1)/2)
assert(h_split_auto.sum() >= (h_split_auto.shape[0]-1)/4)
c_split_auto = CR(A, method='concurrent', thetacr=0.7,
thetacs='auto')
assert(c_split_auto.sum() <= (c_split_auto.shape[0]+1)/2)
assert(c_split_auto.sum() >= (c_split_auto.shape[0]-1)/4)
h_split = CR(A, method='habituated', thetacr=0.7,
thetacs=[0.3, 0.5])
assert(h_split.sum() <= (h_split.shape[0]+1)/2)
assert(h_split.sum() >= (h_split.shape[0]-1)/4)
c_split = CR(A, method='concurrent', thetacr=0.7,
thetacs=[0.3, 0.5])
assert(c_split.sum() <= (c_split.shape[0]+1)/2)
assert(c_split.sum() >= (c_split.shape[0]-1)/4)
def extend_hierarchy(levels, strength, CF, keep, prolongation_function):
"""Extend the multigrid hierarchy."""
def unpack_arg(v):
if isinstance(v, tuple):
return v[0], v[1]
else:
return v, {}
A = levels[-1].A
# Compute the strength-of-connection matrix C, where larger
# C[i,j] denote stronger couplings between i and j.
fn, kwargs = unpack_arg(strength)
if fn == 'symmetric':
C = symmetric_strength_of_connection(A, **kwargs)
elif fn == 'classical':
C = classical_strength_of_connection(A, **kwargs)
elif fn == 'distance':
C = distance_strength_of_connection(A, **kwargs)
elif (fn == 'ode') or (fn == 'evolution'):
C = evolution_strength_of_connection(A, **kwargs)
elif fn == 'energy_based':
C = energy_based_strength_of_connection(A, **kwargs)
elif fn == 'algebraic_distance':
C = algebraic_distance(A, **kwargs)
elif fn == 'affinity':
C = affinity_distance(A, **kwargs)
elif fn is None:
C = A
else:
raise ValueError('unrecognized strength of connection method: %s' %
str(fn))
# Generate the C/F splitting
fn, kwargs = unpack_arg(CF)
if fn == 'RS':
splitting = split.RS(C, **kwargs)
elif fn == 'PMIS':
splitting = split.PMIS(C, **kwargs)
elif fn == 'PMISc':
splitting = split.PMISc(C, **kwargs)
elif fn == 'CLJP':
splitting = split.CLJP(C, **kwargs)
elif fn == 'CLJPc':
splitting = split.CLJPc(C, **kwargs)
elif fn == 'CR':
splitting = CR(C, **kwargs)
else:
raise ValueError('unknown C/F splitting method (%s)' % CF)
# Generate the interpolation matrix that maps from the coarse-grid to the
# fine-grid
baseline_P = direct_interpolation(A, C, splitting)
coarse_nodes = np.nonzero(splitting)[0]
# Create a prolongation matrix with the same coarse-fine splitting and sparsity pattern
# as the baseline
P = prolongation_function(A, coarse_nodes, baseline_P, C)
# Generate the restriction matrix that maps from the fine-grid to the
# coarse-grid
R = P.T.tocsr()
# Store relevant information for this level
if keep:
levels[-1].C = C # strength of connection matrix
levels[-1].splitting = splitting # C/F splitting
levels[-1].P = P # prolongation operator
levels[-1].R = R # restriction operator
levels.append(multilevel_solver.level())
# Form next level through Galerkin product
A = R * A * P
levels[-1].A = A
def extend_hierarchy(levels, strength, CF, interp, restrict, filter_operator,
coarse_grid_P, coarse_grid_R, keep):
""" helper function for local methods """
# Filter operator. Need to keep original matrix on fineest level for
# computing residuals
if (filter_operator is not None) and (filter_operator[1] != 0):
if len(levels) == 1:
A = deepcopy(levels[-1].A)
else:
A = levels[-1].A
filter_matrix_rows(A,
filter_operator[1],
diagonal=True,
lump=filter_operator[0])
else:
A = levels[-1].A
# Check if matrix was filtered to be diagonal --> coarsest grid
if A.nnz == A.shape[0]:
return 1
# Zero initial complexities for strength, splitting and interpolation
levels[-1].complexity['CF'] = 0.0
levels[-1].complexity['strength'] = 0.0
levels[-1].complexity['interpolate'] = 0.0
# Compute the strength-of-connection matrix C, where larger
# C[i,j] denote stronger couplings between i and j.
fn, kwargs = unpack_arg(strength)
if fn == 'symmetric':
C = symmetric_strength_of_connection(A, **kwargs)
elif fn == 'classical':
C = classical_strength_of_connection(A, **kwargs)
elif fn == 'distance':
C = distance_strength_of_connection(A, **kwargs)
elif (fn == 'ode') or (fn == 'evolution'):
C = evolution_strength_of_connection(A, **kwargs)
elif fn == 'energy_based':
C = energy_based_strength_of_connection(A, **kwargs)
elif fn == 'algebraic_distance':
C = algebraic_distance(A, **kwargs)
elif fn == 'affinity':
C = affinity_distance(A, **kwargs)
elif fn is None:
C = A
else:
raise ValueError('unrecognized strength of connection method: %s' %
str(fn))
levels[-1].complexity['strength'] += kwargs['cost'][0] * A.nnz / float(
A.nnz)
# Generate the C/F splitting
fn, kwargs = unpack_arg(CF)
if fn == 'RS':
splitting = RS(C, **kwargs)
elif fn == 'PMIS':
splitting = PMIS(C, **kwargs)
elif fn == 'PMISc':
splitting = PMISc(C, **kwargs)
elif fn == 'CLJP':
splitting = CLJP(C, **kwargs)
elif fn == 'CLJPc':
splitting = CLJPc(C, **kwargs)
elif fn == 'CR':
splitting = CR(C, **kwargs)
elif fn == 'weighted_matching':
splitting, soc = weighted_matching(C, **kwargs)
if soc is not None:
C = soc
else:
raise ValueError('unknown C/F splitting method (%s)' % CF)
levels[-1].complexity['CF'] += kwargs['cost'][0] * C.nnz / float(A.nnz)
temp = np.sum(splitting)
if (temp == len(splitting)) or (temp == 0):
return 1
# Generate the interpolation matrix that maps from the coarse-grid to the
# fine-grid
r_flag = False
fn, kwargs = unpack_arg(interp)
if fn == 'standard':
P = standard_interpolation(A, C, splitting, **kwargs)
elif fn == 'distance_two':
P = distance_two_interpolation(A, C, splitting, **kwargs)
elif fn == 'direct':
P = direct_interpolation(A, C, splitting, **kwargs)
elif fn == 'one_point':
P = one_point_interpolation(A, C, splitting, **kwargs)
elif fn == 'inject':
P = injection_interpolation(A, splitting, **kwargs)
elif fn == 'neumann':
P = neumann_ideal_interpolation(A, splitting, **kwargs)
elif fn == 'scaledAfc':
P = scaled_Afc_interpolation(A, splitting, **kwargs)
elif fn == 'air':
if isspmatrix_bsr(A):
temp_A = bsr_matrix(A.T)
P = local_AIR(temp_A, splitting, **kwargs)
P = bsr_matrix(P.T)
else:
temp_A = csr_matrix(A.T)
P = local_AIR(temp_A, splitting, **kwargs)
P = csr_matrix(P.T)
elif fn == 'restrict':
r_flag = True
else:
raise ValueError('unknown interpolation method (%s)' % interp)
levels[-1].complexity['interpolate'] += kwargs['cost'][0] * A.nnz / float(
A.nnz)
# Build restriction operator
fn, kwargs = unpack_arg(restrict)
if fn is None:
R = P.T
elif fn == 'air':
R = local_AIR(A, splitting, **kwargs)
elif fn == 'neumann':
R = neumann_AIR(A, splitting, **kwargs)
elif fn == 'one_point': # Don't need A^T here
temp_C = C.T.tocsr()
R = one_point_interpolation(A, temp_C, splitting, **kwargs)
if isspmatrix_bsr(A):
R = R.T.tobsr()
else:
R = R.T.tocsr()
elif fn == 'inject': # Don't need A^T or C^T here
R = injection_interpolation(A, splitting, **kwargs)
if isspmatrix_bsr(A):
R = R.T.tobsr()
else:
R = R.T.tocsr()
elif fn == 'standard':
if isspmatrix_bsr(A):
temp_A = A.T.tobsr()
temp_C = C.T.tobsr()
R = standard_interpolation(temp_A, temp_C, splitting, **kwargs)
R = R.T.tobsr()
else:
temp_A = A.T.tocsr()
temp_C = C.T.tocsr()
R = standard_interpolation(temp_A, temp_C, splitting, **kwargs)
R = R.T.tocsr()
elif fn == 'distance_two':
if isspmatrix_bsr(A):
temp_A = A.T.tobsr()
temp_C = C.T.tobsr()
R = distance_two_interpolation(temp_A, temp_C, splitting, **kwargs)
R = R.T.tobsr()
else:
temp_A = A.T.tocsr()
temp_C = C.T.tocsr()
R = distance_two_interpolation(temp_A, temp_C, splitting, **kwargs)
R = R.T.tocsr()
elif fn == 'direct':
if isspmatrix_bsr(A):
temp_A = A.T.tobsr()
temp_C = C.T.tobsr()
R = direct_interpolation(temp_A, temp_C, splitting, **kwargs)
R = R.T.tobsr()
else:
temp_A = A.T.tocsr()
temp_C = C.T.tocsr()
R = direct_interpolation(temp_A, temp_C, splitting, **kwargs)
R = R.T.tocsr()
else:
raise ValueError('unknown restriction method (%s)' % restrict)
# If set P = R^T
if r_flag:
P = R.T
# Optional different interpolation for RAP
fn, kwargs = unpack_arg(coarse_grid_P)
if fn == 'standard':
P_temp = standard_interpolation(A, C, splitting, **kwargs)
elif fn == 'distance_two':
P_temp = distance_two_interpolation(A, C, splitting, **kwargs)
elif fn == 'direct':
P_temp = direct_interpolation(A, C, splitting, **kwargs)
elif fn == 'one_point':
P_temp = one_point_interpolation(A, C, splitting, **kwargs)
elif fn == 'inject':
P_temp = injection_interpolation(A, splitting, **kwargs)
elif fn == 'neumann':
P_temp = neumann_ideal_interpolation(A, splitting, **kwargs)
elif fn == 'air':
if isspmatrix_bsr(A):
temp_A = bsr_matrix(A.T)
P_temp = local_AIR(temp_A, splitting, **kwargs)
P_temp = bsr_matrix(P_temp.T)
else:
temp_A = csr_matrix(A.T)
P_temp = local_AIR(temp_A, splitting, **kwargs)
P_temp = csr_matrix(P_temp.T)
else:
P_temp = P
# Optional different restriction for RAP
fn, kwargs = unpack_arg(coarse_grid_R)
if fn == 'air':
R_temp = local_AIR(A, splitting, **kwargs)
elif fn == 'neumann':
R_temp = neumann_AIR(A, splitting, **kwargs)
elif fn == 'one_point': # Don't need A^T here
temp_C = C.T.tocsr()
R_temp = one_point_interpolation(A, temp_C, splitting, **kwargs)
if isspmatrix_bsr(A):
R_temp = R_temp.T.tobsr()
else:
R_temp = R_temp.T.tocsr()
elif fn == 'inject': # Don't need A^T or C^T here
R_temp = injection_interpolation(A, splitting, **kwargs)
if isspmatrix_bsr(A):
R_temp = R_temp.T.tobsr()
else:
R_temp = R_temp.T.tocsr()
elif fn == 'standard':
if isspmatrix_bsr(A):
temp_A = A.T.tobsr()
temp_C = C.T.tobsr()
R_temp = standard_interpolation(temp_A, temp_C, splitting,
**kwargs)
R_temp = R_temp.T.tobsr()
else:
temp_A = A.T.tocsr()
temp_C = C.T.tocsr()
R_temp = standard_interpolation(temp_A, temp_C, splitting,
**kwargs)
R_temp = R_temp.T.tocsr()
elif fn == 'distance_two':
if isspmatrix_bsr(A):
temp_A = A.T.tobsr()
temp_C = C.T.tobsr()
R_temp = distance_two_interpolation(temp_A, temp_C, splitting,
**kwargs)
R_temp = R_temp.T.tobsr()
else:
temp_A = A.T.tocsr()
temp_C = C.T.tocsr()
R_temp = distance_two_interpolation(temp_A, temp_C, splitting,
**kwargs)
R_temp = R_temp.T.tocsr()
elif fn == 'direct':
if isspmatrix_bsr(A):
temp_A = A.T.tobsr()
temp_C = C.T.tobsr()
R_temp = direct_interpolation(temp_A, temp_C, splitting, **kwargs)
R_temp = R_temp.T.tobsr()
else:
temp_A = A.T.tocsr()
temp_C = C.T.tocsr()
R_temp = direct_interpolation(temp_A, temp_C, splitting, **kwargs)
R_temp = R_temp.T.tocsr()
else:
R_temp = R
# Store relevant information for this level
if keep:
levels[-1].C = C # strength of connection matrix
levels[-1].P = P # prolongation operator
levels[-1].R = R # restriction operator
levels[-1].splitting = splitting # C/F splitting
# Form coarse grid operator, get complexity
#levels[-1].complexity['RAP'] = mat_mat_complexity(R_temp,A) / float(A.nnz)
#RA = R_temp * A
#levels[-1].complexity['RAP'] += mat_mat_complexity(RA,P_temp) / float(A.nnz)
#A = RA * P_temp
# RL: RAP = R*(A*P)
levels[-1].complexity['RAP'] = mat_mat_complexity(A, P_temp) / float(A.nnz)
AP = A * P_temp
levels[-1].complexity['RAP'] += mat_mat_complexity(R_temp, AP) / float(
A.nnz)
A = R_temp * AP
# Make sure coarse-grid operator is in correct sparse format
if (isspmatrix_csr(P) and (not isspmatrix_csr(A))):
A = A.tocsr()
elif (isspmatrix_bsr(P) and (not isspmatrix_bsr(A))):
A = A.tobsr()
A.eliminate_zeros()
levels.append(multilevel_solver.level())
levels[-1].A = A
return 0
def test_cr(self):
A = self.cases[6]
splitting = CR(A)
# 1d-tests, should be alternating aggregates
# (n-1)/2 < = sum <= (n+1)/2.
# Test auto thetacs and set thetacs values
for i in range(3,10):
A = self.cases[i]
h_split_auto = CR(A, method='habituated', thetacr=0.7, thetacs='auto')
assert(h_split_auto.sum() <= (h_split_auto.shape[0]+1)/2 )
assert(h_split_auto.sum() >= (h_split_auto.shape[0]-1)/2 )
c_split_auto = CR(A, method='concurrent', thetacr=0.7, thetacs='auto')
assert(c_split_auto.sum() <= (c_split_auto.shape[0]+1)/2 )
assert(c_split_auto.sum() >= (c_split_auto.shape[0]-1)/2 )
h_split = CR(A, method='habituated', thetacr=0.7, thetacs=[0.3,0.5])
assert(h_split.sum() <= (h_split.shape[0]+1)/2 )
assert(h_split.sum() >= (h_split.shape[0]-1)/2 )
c_split = CR(A, method='concurrent', thetacr=0.7, thetacs=[0.3,0.5])
assert(c_split.sum() <= (c_split.shape[0]+1)/2 )
assert(c_split.sum() >= (c_split.shape[0]-1)/2 )
# 2d-tests. CR is a little more picky with parameters and relaxation
# type in 2d. Can still bound above by (n+1)/2. Need looser lower bound,
# say (n+1)/4.
for i in range(10,15):
A = self.cases[i]
h_split_auto = CR(A, method='habituated', thetacr=0.7, thetacs='auto')
assert(h_split_auto.sum() <= (h_split_auto.shape[0]+1)/2 )
assert(h_split_auto.sum() >= (h_split_auto.shape[0]-1)/4 )
c_split_auto = CR(A, method='concurrent', thetacr=0.7, thetacs='auto')
assert(c_split_auto.sum() <= (c_split_auto.shape[0]+1)/2 )
assert(c_split_auto.sum() >= (c_split_auto.shape[0]-1)/4 )
h_split = CR(A, method='habituated', thetacr=0.7, thetacs=[0.3,0.5])
assert(h_split.sum() <= (h_split.shape[0]+1)/2 )
assert(h_split.sum() >= (h_split.shape[0]-1)/4 )
c_split = CR(A, method='concurrent', thetacr=0.7, thetacs=[0.3,0.5])
assert(c_split.sum() <= (c_split.shape[0]+1)/2 )
assert(c_split.sum() >= (c_split.shape[0]-1)/4 )
def test_cr(self):
A = self.cases[6]
splitting = CR(A)
assert (splitting.sum() < splitting.shape[0])
def test_cr(self):
A = self.cases[6]
splitting = CR(A)
assert(splitting.sum() < splitting.shape[0])
