def run_optimization_best_practice_2states(**kwargs):
"""
First optimize the ground state and then optimize the excited
states while fixing the
"""
mol, mf, mc = H2_casci()
import copy
mf.output = None
mol.output = None
mc.output = None
mc.stdout = None
mol.stdout = None
mc.stdout = None
nstates = 2
mcs = [copy.copy(mc) for i in range(nstates)]
for i in range(nstates):
mcs[i].ci = mc.ci[i]
wfs = []
to_opts = []
for i in range(nstates):
wf, to_opt = pyq.generate_wf(
mol, mf, mc=mcs[i], slater_kws=dict(optimize_determinants=True))
wfs.append(wf)
to_opts.append(to_opt)
configs = pyq.initial_guess(mol, 1000)
pgrad1 = pyq.gradient_generator(mol, wfs[0], to_opt=to_opts[0])
wfs[0], _ = pyq.line_minimization(wfs[0],
configs,
pgrad1,
verbose=True,
max_iterations=10)
for k in to_opts[0]:
to_opts[0][k] = np.zeros_like(to_opts[0][k])
to_opts[0]['wf1det_coeff'][0] = True #Bug workaround for linear transform
for to_opt in to_opts[1:]:
to_opt['wf1det_coeff'] = np.ones_like(to_opt['wf1det_coeff'])
transforms = [
pyqmc.accumulators.LinearTransform(wf.parameters, to_opt)
for wf, to_opt in zip(wfs, to_opts)
]
for wf in wfs[1:]:
for k in wf.parameters.keys():
if 'wf2' in k:
wf.parameters[k] = wfs[0].parameters[k].copy()
_, configs = pyq.vmc(wfs[0], configs)
energy = pyq.EnergyAccumulator(mol)
return optimize(wfs, configs, energy, transforms, **kwargs)
def test_sampler(H2_casci):
mol, mf, mc = H2_casci
ci_energies= mc.e_tot
mc1 = copy.copy(mc)
mc2 = copy.copy(mc)
mc1.ci = mc.ci[0]
mc2.ci = (mc.ci[0]+mc.ci[1])/np.sqrt(2)
wf1, to_opt1 = pyq.generate_slater(mol, mf,mc=mc1, optimize_determinants=True)
wf2, to_opt2 = pyq.generate_slater(mol, mf, mc=mc2, optimize_determinants=True)
for to_opt in [to_opt1, to_opt2]:
to_opt['det_coeff'] = np.ones_like(to_opt['det_coeff'],dtype=bool)
transform1 = pyqmc.accumulators.LinearTransform(wf1.parameters,to_opt1)
transform2 = pyqmc.accumulators.LinearTransform(wf2.parameters,to_opt2)
configs = pyq.initial_guess(mol, 2000)
_, configs = pyq.vmc(wf1, configs)
energy =pyq.EnergyAccumulator(mol)
data_weighted, data_unweighted, configs = sample_overlap_worker([wf1,wf2],configs, energy, [transform1,transform2], nsteps=40, nblocks=20)
avg, error = average(data_weighted, data_unweighted)
print(avg, error)
ref_energy1 = 0.5*(ci_energies[0] + ci_energies[1])
assert abs(avg['total'][1,1] - ref_energy1) < 3*error['total'][1][1]
ref_energy01 = ci_energies[0]/np.sqrt(2)
assert abs(avg['total'][0,1] - ref_energy01) < 3*error['total'][0,1]
overlap_tolerance = 0.2# magic number..be careful.
terms = collect_terms(avg,error)
norm = [np.sum(np.abs(m.ci)**2) for m in [mc1,mc2]]
norm_ref = norm
assert np.all( np.abs(norm_ref - terms['norm']) < overlap_tolerance)
norm_derivative_ref = 2*np.real(mc2.ci).flatten()
print(terms[('dp_norm',1)].shape, norm_derivative_ref.shape)
assert np.all(np.abs(norm_derivative_ref - terms[('dp_norm',1)])<overlap_tolerance)
overlap_ref = np.sum(mc1.ci*mc2.ci)
print('overlap test', overlap_ref, terms['overlap'][0,1])
assert abs(overlap_ref - terms['overlap'][0,1]) < overlap_tolerance
overlap_derivative_ref = (mc1.ci.flatten() - 0.5*overlap_ref * norm_derivative_ref)
assert np.all( np.abs(overlap_derivative_ref - terms[('dp_overlap',1)][:,0,1]) < overlap_tolerance)
en_derivative = take_derivative_casci_energy(mc, mc2.ci)
assert(np.all(abs(terms[('dp_energy',1)][:,1,1].reshape(mc2.ci.shape)-en_derivative) -overlap_tolerance) )
derivative = objective_function_derivative(terms,1.0, norm_relative_penalty=1.0, offdiagonal_energy_penalty=0.1)
def test_correlated_sampling(H2_casci):
mol, mf, mc = H2_casci
ci_energies= mc.e_tot
import copy
mc1 = copy.copy(mc)
mc2 = copy.copy(mc)
mc1.ci = mc.ci[0]
mc2.ci = mc.ci[1]
wf1, to_opt1 = pyq.generate_slater(mol, mf,mc=mc1, optimize_determinants=True)
wf2, to_opt2 = pyq.generate_slater(mol, mf, mc=mc2, optimize_determinants=True)
for to_opt in [to_opt1, to_opt2]:
to_opt['det_coeff'] = np.ones_like(to_opt['det_coeff'],dtype=bool)
transform1 = pyqmc.accumulators.LinearTransform(wf1.parameters,to_opt1)
transform2 = pyqmc.accumulators.LinearTransform(wf2.parameters,to_opt2)
configs = pyq.initial_guess(mol, 1000)
_, configs = pyq.vmc(wf1, configs)
energy =pyq.EnergyAccumulator(mol)
data_weighted, data_unweighted, configs = sample_overlap_worker([wf1,wf2],configs, energy, [transform1,transform2], nsteps=10, nblocks=10)
parameters1 = transform1.serialize_parameters(wf1.parameters)
parameters2 = transform1.serialize_parameters(wf2.parameters)
sample_parameters = []
energies_reference = []
overlap_reference = []
for theta in np.linspace(0,np.pi/2, 4):
a = np.cos(theta)
b = np.sin(theta)
sample_parameters.append([a*parameters1 + b*parameters2, a*parameters1 - b*parameters2])
energies_reference.append([a**2*ci_energies[0] + b**2*ci_energies[1]]*2)
overlap_reference.append([[1.0, a**2-b**2], [a**2-b**2,1.0]] )
energies_reference=np.asarray(energies_reference)
overlap_reference=np.asarray(overlap_reference)
correlated_results = correlated_sampling([wf1,wf2], configs,energy, [transform1,transform2], sample_parameters )
print(correlated_results)
energy_sample = correlated_results['energy']/correlated_results['overlap']
print('energy reference',energies_reference)
print('energy sample', energy_sample)
assert np.all(np.abs(energy_sample.diagonal(axis1=1,axis2=2) - energies_reference) < 0.1)
print('overlap sample', correlated_results['overlap'])
print('overlap reference', overlap_reference)
assert np.all(np.abs(correlated_results['overlap']-overlap_reference)<0.1)
def test_shci_wf_is_better(H2_ccecp_hci):
mol, mf, cisolver = H2_ccecp_hci
configs = pyq.initial_guess(mol, 1000)
wf = Slater(mol, mf, cisolver, tol=0.0)
data, configs = pyq.vmc(
wf,
configs,
nblocks=40,
verbose=True,
accumulators={"energy": pyq.EnergyAccumulator(mol)},
)
en, err = avg(data["energytotal"][1:])
nsigma = 4
assert len(wf.parameters["det_coeff"]) == len(cisolver.ci)
assert en - nsigma * err < mf.e_tot
assert en + nsigma * err > cisolver.energy
def runtest(mol, mf, kind=0):
kpt = mf.kpts[kind]
dm = mf.make_rdm1()
print("original dm shape", dm.shape)
if len(dm.shape) == 4:
dm = np.sum(dm, axis=0)
dm = dm[kind]
#####################################
## evaluate KE in PySCF
#####################################
ke_mat = mol.pbc_intor("int1e_kin", hermi=1, kpts=np.array(kpt))
print("ke_mat", ke_mat.shape)
print("dm", dm.shape)
pyscfke = np.real(np.einsum("ij,ji->", ke_mat, dm))
print("PySCF kinetic energy: {0}".format(pyscfke))
#####################################
## evaluate KE integral with VMC
#####################################
wf = Slater(mol, mf)
coords = pyq.initial_guess(mol, 1200, 0.7)
warmup = 10
start = time.time()
df, coords = pyq.vmc(
wf,
coords,
nsteps=100 + warmup,
tstep=1,
accumulators={"energy": pyq.EnergyAccumulator(mol)},
verbose=False,
hdf_file=str(uuid.uuid4()),
)
print("VMC time", time.time() - start)
df = pd.DataFrame(df)
dfke = pyq.avg_reblock(df["energyke"][warmup:], 10)
vmcke, err = dfke.mean(), dfke.sem()
print("VMC kinetic energy: {0} +- {1}".format(vmcke, err))
assert (
np.abs(vmcke - pyscfke) < 5 * err
), "energy diff not within 5 sigma ({0:.6f}): energies \n{1} \n{2}".format(
5 * err, vmcke, pyscfke
)
def test_dmc_restarts(H_pbc_sto3g_krks, nconf=10):
"""For PBCs, check to make sure there are no
errors on restart."""
mol, mf = H_pbc_sto3g_krks
nconf = 10
fname = "test_dmc_restart_" + str(uuid.uuid4())
configs = pyq.initial_guess(mol, nconf)
wf, _ = pyq.generate_wf(mol, mf, jastrow_kws=dict(na=0, nb=0))
enacc = pyq.EnergyAccumulator(mol)
pyq.rundmc(wf,
configs,
nsteps=20,
hdf_file=fname,
accumulators={"energy": enacc})
pyq.rundmc(wf,
configs,
nsteps=20,
hdf_file=fname,
accumulators={"energy": enacc})
os.remove(fname)
def test():
""" Ensure that DMC obtains the exact result for a hydrogen atom """
from pyscf import gto, scf
from pyqmc.dmc import limdrift
import pandas as pd
mol = gto.M(atom="H 0. 0. 0.", basis="sto-3g", unit="bohr", spin=1)
mf = scf.UHF(mol).run()
nconf = 1000
configs = pyq.initial_guess(mol, nconf)
wf, _ = pyq.generate_wf(mol, mf, jastrow_kws=dict(na=0, nb=0))
enacc = pyq.EnergyAccumulator(mol)
warmup = 200
branchtime = 5
dfdmc, configs_, weights_ = pyq.rundmc(
wf,
configs,
nsteps=4000 + warmup * branchtime,
branchtime=branchtime,
accumulators={"energy": enacc},
ekey=("energy", "total"),
tstep=0.01,
verbose=True,
)
dfdmc = pd.DataFrame(dfdmc)
dfdmc.sort_values("step", inplace=True)
dfprod = dfdmc[dfdmc.step >= warmup]
rb_summary = reblock.reblock_summary(dfprod[["energytotal", "energyei"]],
20,
weights=dfprod["weight"])
energy, err = [
rb_summary[v]["energytotal"] for v in ("mean", "standard error")
]
assert (np.abs(energy + 0.5) <
5 * err), "energy not within {0} of -0.5: energy {1}".format(
5 * err, np.mean(energy))
def runtest(mol, mf, kind=0):
kpt = mf.kpts[kind]
twist = np.dot(kpt, mol.lattice_vectors().T / (2 * np.pi))
wf0 = Slater(mol, mf)
wft = Slater(mol, mf, twist=twist)
#####################################
## compare values across boundary
## psi, KE, ecp,
#####################################
nconfig = 50
coords = pyq.initial_guess(mol, nconfig, 1)
epos, wrap = enforce_pbc(coords.lvecs, coords.configs)
coords = PeriodicConfigs(epos, coords.lvecs)
shift_ = np.random.randint(10, size=coords.configs.shape) - 5
phase = np.exp(2j * np.pi * np.einsum("ijk,k->ij", shift_, twist))
shift = np.dot(shift_, mol.lattice_vectors())
epos, wrap = enforce_pbc(coords.lvecs, epos + shift)
newcoords = PeriodicConfigs(epos, coords.lvecs, wrap=wrap)
assert np.linalg.norm(newcoords.configs - coords.configs) < 1e-12
ph0, val0 = wf0.recompute(coords)
pht, valt = wft.recompute(coords)
enacc = pyq.EnergyAccumulator(mol, threshold=np.inf)
np.random.seed(0)
en0 = enacc(coords, wf0)
np.random.seed(0)
ent = enacc(coords, wft)
e = 0
rat0 = wf0.testvalue(e, newcoords.electron(e))
assert np.linalg.norm(rat0 - 1) < 1e-9, rat0 - 1
ratt = wft.testvalue(e, newcoords.electron(e))
rattdiff = ratt - phase[:, e]
print("phase", phase[:, e])
assert np.linalg.norm(rattdiff) < 1e-9, [
np.round(rattdiff, 10),
np.amax(np.abs(rattdiff)),
]
ph0new, val0new = wf0.recompute(newcoords)
phtnew, valtnew = wft.recompute(newcoords)
np.random.seed(0)
en0new = enacc(newcoords, wf0)
np.random.seed(0)
entnew = enacc(newcoords, wft)
assert np.linalg.norm(ph0 - ph0new) < 1e-11
assert np.linalg.norm(pht * phase.prod(axis=1) - phtnew) < 1e-11, (
pht * phase.prod(axis=1) - phtnew)
assert np.linalg.norm(val0 - val0new) < 1e-11, np.linalg.norm(val0 -
val0new)
assert np.linalg.norm(valt - valtnew) < 1e-11, np.linalg.norm(valt -
valtnew)
for k in en0.keys():
diff0 = en0[k] - en0new[k]
difft = ent[k] - entnew[k]
if k == "ecp":
for l, diff in [("0", diff0), ("t", difft)]:
mad = np.mean(np.abs(diff))
if True: # mad > 1e-12:
print("ecp%s diff" % l, mad, np.linalg.norm(diff))
assert mad < 1e-3, diff
else:
assert np.mean(np.abs(diff0)) < 1e-6, diff0
assert np.mean(np.abs(difft)) < 1e-6, difft