def run_simulation(**kwargs):
kp = KwargsParser(kwargs, DEFAULTS)
folder = Path(kp.folder).expanduser()
folder.mkdir(exist_ok=True, parents=True)
file_str = f'L_{kp.L}_chi_{kp.chi}_g_{kp.g}_{kp.contraction_method}'
logger = Logger(None, True)
opt_logger = Logger(folder.joinpath(file_str + '.opt.log'), True)
kp.log(opt_logger)
opt_logger.lineskip()
outfile = folder.joinpath(file_str + '.pkl')
statefile = folder.joinpath(file_str + '.state.pkl')
kp.log(logger)
def callback(tensors, k):
if (k % kp.save_interval == 0) and (k > 0):
with open(statefile, 'wb') as _f:
pickle.dump(dict(kwargs=kp.kwargs(), k=k, tensors=tensors), _f)
opt_opts = dict(display_fun=get_display_fun(opt_logger),
line_search_fn='strong_wolfe',
max_iter=kp.max_iter,
callback=callback,
dtype=np.complex128)
cont_opts = dict(contraction_method=kp.contraction_method)
model = TFIM(kp.g, 'obc', lx=kp.L, ly=kp.L, dtype_hamiltonian=np.float64)
gs, gs_energy = model.groundstate(kp.chi, (kp.L, kp.L), kp.initial_state, kp.initial_noise,
cont_opts, opt_opts)
results = dict(kwargs=kp.kwargs(),
gs_energy=gs_energy,
gs_tensors=gs.get_tensors(),
logfile=str(logger.logfile))
print(f'saving results to {outfile}')
# noinspection PyTypeChecker
with open(outfile, 'wb') as f:
pickle.dump(results, f)
def run_simulation(**kwargs):
kp = KwargsParser(kwargs, DEFAULTS)
folder = Path(kp.folder).expanduser()
folder.mkdir(exist_ok=True, parents=True)
logger = Logger(
folder.joinpath(f'chi_{kp.chi}_Dopt_{kp.D_opt}_{kp.init}.log'), True)
kp.log(logger)
gs = None
for g in kp.g_list:
logger.lineskip()
logger.log(f'g={g}')
file_str = f'chi_{kp.chi}_Dopt_{kp.D_opt}_g_{g}_{kp.init}'
opt_logger = Logger(folder.joinpath(file_str + '.opt.log'), True)
outfile = folder.joinpath(file_str + '.pkl')
opt_opts = dict(display_fun=get_display_fun(opt_logger),
line_search_fn='strong_wolfe',
max_iter=kp.max_iter,
dtype=np.float64)
cont_opts = dict(chi_ctm=kp.D_opt)
model = TFIM(g, bc='infinite', dtype_hamiltonian=np.float64)
# initial state
if kp.init == 'load':
# find the file with the closest g
g_closest = np.inf
file_closest = None
for f in os.listdir(folder):
if f[-3:] != 'pkl':
continue
start = f.rfind('_g_')
if start == -1:
continue
ends = [
f.rfind(f'_{init}') for init in ['ps', 'z+', 'x+', 'load']
]
end = [e for e in ends if e != -1][0]
_g = float(f[start + 3:end])
if np.abs(g - _g) < np.abs(g -
g_closest): # closer then previous
g_closest = _g
file_closest = f
# noinspection PyBroadException
try:
with open(folder.joinpath(file_closest), 'rb') as f:
results = pickle.load(f)
init = results['gs']
initial_noise = 0.
print(f'loaded initial guess from {file_closest}')
except Exception:
if gs: # if gs is available from previous loop iteration, use that
# failed to load even though this is not the first loop iteration
print('warning: loading from file failed', file=sys.stderr)
init = gs
initial_noise = 0.001
else: # if nothing found, use product state
init = 'ps'
initial_noise = 0.05
elif kp.init == 'last':
if gs:
init = gs
initial_noise = 0.
else:
init = 'ps'
initial_noise = 0.05
else:
init = kp.init
initial_noise = 0.05
gs, gs_energy = model.groundstate(chi=kp.chi,
initial_state=init,
initial_noise=initial_noise,
contraction_options=cont_opts,
optimisation_options=opt_opts)
en_list = []
mag_list = []
D_obs_list = []
for D_obs in list(range(kp.D_opt))[10::10] + [kp.D_opt]:
logger.log(f'D_obs={D_obs}')
D_obs_list.append(D_obs)
cont_opts['chi_ctm'] = D_obs
en_list.append(model.energy(gs, **cont_opts))
mag_list.append(
LocalOperator(sx, np.array([[0]]),
hermitian=True).expval(gs, **cont_opts))
print(f'saving results to {outfile}')
results = dict(kwargs=kwargs,
g=g,
optimal_energy=gs_energy,
D_obs_list=D_obs_list,
en_list=en_list,
mag_list=mag_list,
logfile=str(opt_logger.logfile),
gs_tensors=gs.get_tensors())
with open(outfile, 'wb') as f:
pickle.dump(results, f)
for D_obs in list(range(kp.D_opt,
2 * kp.D_opt))[10::10] + [2 * kp.D_opt]:
logger.log(f'D_obs={D_obs}')
D_obs_list.append(D_obs)
cont_opts['chi_ctm'] = D_obs
en_list.append(model.energy(gs, **cont_opts))
mag_list.append(
LocalOperator(sx, np.array([[0]]),
hermitian=True).expval(gs, **cont_opts))
results = dict(kwargs=kwargs,
g=g,
optimal_energy=gs_energy,
D_obs_list=D_obs_list,
en_list=en_list,
mag_list=mag_list,
logfile=str(opt_logger.logfile),
gs_tensors=gs.get_tensors())
with open(outfile, 'wb') as f:
pickle.dump(results, f)
