# solve for Eigenvalues
state = adcc.adc2(scfres, n_singlets=1, conv_tol=1e-8)
# setup modified transition moments
dips = state.reference_state.operators.electric_dipole
rhss = [
compute_modified_transition_moments(state.matrix, dip, "adc2")
for dip in dips
]
S = np.zeros((len(state.excitation_energies), 3, 3))
for f, ee in enumerate(state.excitation_energies):
freq = ee / 2.0
matrix = ShiftedMat("adc2", state.ground_state, freq)
preconditioner = JacobiPreconditioner(matrix)
explicit_symmetrisation = IndexSymmetrisation(matrix)
preconditioner.update_shifts(freq)
response = []
# solve all systems of equations
for mu in range(3):
rhs = rhss[mu]
x0 = preconditioner.apply(rhs)
res = conjugate_gradient(
matrix, rhs=rhs, x0=x0, callback=default_print,
Pinv=preconditioner, conv_tol=1e-6,
explicit_symmetrisation=explicit_symmetrisation
)
response.append(res)
for mu in range(3):
for nu in range(mu, 3):
def relax_cvs(scfres, method, state, ctol=5e-5):
singles_block_only = False
if adcc.AdcMethod(method).level > 1 and "d" not in state.matrix.blocks:
singles_block_only = True
# Singles block only method
refstate = adcc.ReferenceState(scfres)
origmatrix = adcc.AdcBlockView(adcc.AdcMatrix(method, refstate), "s")
else:
refstate = adcc.ReferenceState(scfres)
origmatrix = adcc.AdcMatrix(method, refstate)
matrix = AdcMatrixShifted(origmatrix)
explicit_symmetrisation = IndexSpinSymmetrisation(
matrix, enforce_spin_kind=state.kind)
assert state.kind == "singlet"
fullvec = [
guess_zero(matrix, spin_block_symmetrisation="symmetric")
for i in range(len(state.excitation_vectors))
]
for i in range(len(state.excitation_vectors)):
project_amplitude(state.excitation_vectors[i], fullvec[i])
preconditioner = JacobiPreconditioner(matrix)
relaxed_vec = []
relaxed_ene = []
residual_norms = []
for i in range(len(state.excitation_vectors)):
print("=================")
print(" State {}".format(i))
print("=================")
vec = fullvec[i].copy(
) # Not sure this copy is needed, do it for safety
origvec = vec
ene = state.excitation_energies[i]
eneold = ene
histories = []
residual = 100000
xold = vec
preconditioner.update_shifts(ene - 1e-2)
matrix.update_omega(ene - 1e-3)
print("--> Starting energy {}: {}".format(i, ene))
for it in range(100):
eps = 1e-3 # numerical fuzzing to improve conditioning
if residual > eps / 10 and it > 0:
matrix.update_omega(ene - eps)
preconditioner.update_shifts(ene - eps)
res = conjugate_gradient(
matrix,
rhs=xold,
x0=xold,
callback=default_print,
Pinv=preconditioner,
conv_tol=ctol / 10,
max_iter=400,
)
x = res.solution
x = explicit_symmetrisation.symmetrise([x], [origvec])[0]
x /= np.sqrt(x @ x)
ene = x @ matrix.matmul_orig(x)
enediff = ene - eneold
overlap = np.sqrt(np.abs(origvec @ x))
resres = matrix.matmul_orig(x) - ene * x
residual = np.sqrt(resres @ resres)
print("--> Energy {}: {} (enediff: {})"
"".format(it, ene, enediff))
print("--> Overlap {}: {}".format(it, overlap))
print("--> Residual {}: {}".format(it, residual))
if np.abs(overlap - 1) > 0.2:
if not histories:
if i == 0:
print(
" !!! Low overlap detected and got no history"
"... trying again")
xold = origvec
else:
raise RuntimeError("Low overlap and got no history.")
# Pick the energy of the historic result with the best overlap
# (smallest aberration from 1)
ene = sorted(histories, key=lambda x: x[1])[0][0] + eps
print(
" !!! Low overlap detected! Changing shift to {:.6g} "
"and trying again !!!".format(ene))
xold = origvec
elif residual < ctol:
print("--> converged")
break
else:
xold = x
eneold = ene
histories.append((ene, np.abs(overlap - 1)))
residual_norms.append(np.sqrt(resres @ resres))
relaxed_vec.append(x)
relaxed_ene.append(ene)
class CvsRelaxationState:
pass
res = CvsRelaxationState()
res.matrix = origmatrix
res.kind = "singlet"
res.eigenvectors = relaxed_vec
res.eigenvalues = np.array(relaxed_ene)
property_method = None
if singles_block_only:
# To not get crashes on property calculation (missing doubles part)
property_method = "adc1"
sstate = adcc.ExcitedStates(res,
method=method,
property_method=property_method)
sstate.residual_norms = np.array(residual_norms)
return sstate