import numpy as np
import tempfile
import os
from functools import wraps
import qepy
from qepy.core import env
from qepy.io import QEInput
from qepy import constants
def gathered(function):
@wraps(function)
def wrapper(self, **kwargs):
out = kwargs.get('out', None)
gather = kwargs.get('gather', True)
if out is None : out = self.create_array(gather=gather, kind='rho')
if gather and self.nproc > 1 :
arr = self.create_array(gather=False, kind='rho')
else :
arr = out
#
kwargs['out'] = arr
results = function(self, **kwargs)
#
if gather and self.nproc > 1 :
qepy.qepy_mod.qepy_get_value(arr, out, gather = True)
if isinstance(results, (tuple, list)):
results = out, *results[1:]
else :
results = out
return results
return wrapper
[docs]class Driver(object) :
"""
The driver of QEpy.
Parameters
----------
inputfile : str
Name of QE input file
comm : object
Parallel communicator
ldescf : bool
If True, also print the SCF correction term for each SCF cycle
iterative : bool
Run SCF or real-time TDDFT one iteration at a time
task : str
Task to be performed by the driver :
- 'scf' : Self consistent field
- 'nscf' : initialization of Driver from previous SCF calculation
- 'optical' : Optical absorption spectrum (real-time TDDFT with ce-tddft of Davide Ceresoli)
embed : object (Fortran)
embed object itialized in the Fortran side of QEpy needed to communicate with QE.
prefix : str
prefix of QE input/output
outdir : str
The output directory of QE
logfile : str, file or bool
The screen output of QE. If it is a file descriptor, it should open with 'w+'.
- None : Show on the screen.
- str : Save to the given file.
- True : Save to the temporary file, see also :func:`qepy.driver.Driver.get_output`.
outdir : str
The output directory of QE
qe_options : dict
A dictionary with input parameters for QE to generate QE input file.
See class QEInput
prog : str
The name of QE program, default is `pw` which is pw.x in QE.
progress : bool
If True, will continue run the QE without cleaning the workspace. Most times used for running TDDFT after scf.
atoms : object
An ase Atoms to generate the input file.
needwf : bool
If False, will not read wavefunctions and skip wavefunction-related initialization.
kwargs : dict
Other options
.. note::
- The bool `gather` parameter in functions means the data is gathered on root or distributed on all cpus.
- Units in QEpy are Bohr and Rydberg. These differ from ASE's units. Please, be careful!
+ positions : Bohr
+ lattice : Bohr
+ energy : Ry
+ forces : Ry/Bohr
+ stress : Ry/Bohr**3
+ potential : Ry
+ density : 1.0/Bohr**3
"""
POTNAMES = {'external' : 0, 'localpp' : 1, 'hartree' : 2, 'xc' : 4}
FORCENAMES = {'ewald' : 1, 'localpp' : 2, 'nlcc' : 4}
def __init__(self, inputfile = None, comm = None, ldescf = False, iterative = False,
task = 'scf', embed = None, prefix = None, outdir = None, logfile = None,
qe_options = None, prog = 'pw', progress = False, atoms = None, needwf = True,
**kwargs):
if embed is None :
embed = qepy.qepy_common.embed_base()
self.task = task
self.embed = embed
self.comm = comm
self.inputfile = inputfile
self.iterative = iterative
self.prefix = prefix
self.outdir = outdir
self.logfile = logfile
self.qe_options = qe_options
self.prog = prog
self.progress = progress
self.atoms = atoms
self.needwf = needwf
#
self.embed.ldescf = ldescf
self.embed.iterative = iterative
self.embed.tddft.iterative = iterative
#
self.comm = comm
self.qepy = qepy
self.qeinput = QEInput()
#
self.driver_initialize()
def _init_log(self):
"""_initialize the QE output."""
self.fileobj_interact = False
if self.logfile is not None :
# qepy.qepy_mod.qepy_set_stdout(self.logfile)
if isinstance(self.logfile, bool) and self.logfile :
self.fileobj_interact = True
self.fileobj = tempfile.NamedTemporaryFile('w+')
elif hasattr(self.logfile, 'write'):
self.fileobj = self.logfile
else :
self.fileobj = open(self.logfile, 'w+')
else :
self.fileobj = None
env['STDOUT'] = self.fileobj
return self.fileobj
@property
def comm(self):
return self._comm
@comm.setter
def comm(self, value):
"""Sets the MPI communicator with value given by mpi4py"""
self._comm = value
if self.comm is not None and hasattr(self.comm, 'py2f') :
self.commf = self.comm.py2f()
else :
self.commf = self.comm
@property
def is_root(self):
"""Whether it is the root.
If the comm is set, root is rank == 0.
If comm not set, root is ionode of QE.
"""
if hasattr(self.comm, 'rank'):
return self.comm.rank == 0
else :
return qepy.io_global.get_ionode()
@property
def nproc(self):
if hasattr(self.comm, 'size'):
return self.comm.size
else :
return qepy.mp_world.get_nproc()
@property
def qe_is_mpi(self):
return qepy.qepy_common.get_is_mpi()
@property
def qe_is_openmp(self):
return qepy.qepy_common.get_is_openmp()
[docs] def restart(self, prog=None, **kwargs):
"""Restart the driver losing all information about the previous driver"""
prog = prog or self.prog
self.driver_initialize()
[docs] def driver_initialize(self, **kwargs):
""" Initialize the driver
Parameters
----------
inputfile : str
Name of QE input file
commf : object
mpi4py parallel communicator to be sent to Fortran
task : str
Task to be performed by the driver :
- 'scf' : Self consistent field
- 'nscf' : initialization of Driver from previous SCF calculation
- 'optical' : Optical absorption spectrum (real-time TDDFT with ce-tddft of Davide Ceresoli)
qe_options: dict
A dictionary with input parameters for QE to generate QE input file.
"""
# stop the last driver and save new driver
if not self.progress :
if hasattr(env['DRIVER'], 'stop'): env['DRIVER'].stop()
env['DRIVER'] = self
#
self._init_log()
qepy.qepy_common.set_embed(self.embed)
#
inputfile=self.inputfile
commf=self.commf
task=self.task
qe_options = self.qe_options
prog = self.prog
#
if qe_options :
inputfile, basefile = 'input_tmp.in', inputfile
self.qeinput.write_qe_input(inputfile, atoms = self.atoms, basefile=basefile, qe_options=qe_options, prog=prog)
#
if task == 'optical' :
self.tddft_initialize(inputfile=inputfile, commf = commf, **kwargs)
elif task == 'nscf' :
inputobj = qepy.qepy_common.input_base()
if self.prefix : inputobj.prefix = self.prefix
if self.outdir : inputobj.tmp_dir = str(self.outdir) + '/'
if commf : inputobj.my_world_comm = commf
qepy.qepy_initial(inputobj)
tmpdir = inputobj.tmp_dir.decode().strip() + inputobj.prefix.decode().strip() + '.save' + '/'
if os.path.isfile(tmpdir + 'data-file.xml'): # only works for qe-6.5 !
if not hasattr(qepy, 'oldxml_read_file') :
raise AttributeError("Please reinstall the QEpy with 'oldxml=yes'.")
qepy.oldxml_read_file()
else :
if self.needwf :
qepy.read_file()
else :
qepy.read_file_new(False)
if self.needwf :
qepy.qepy_mod.qepy_open_files()
else :
qepy.qepy_pwscf(inputfile, commf)
if self.embed.iterative :
qepy.control_flags.set_niter(1)
#
self.density = np.zeros((1, 1))
self.iter = 0
[docs] def tddft_initialize(self, inputfile = None, commf = None, **kwargs):
""" Initialize the tddft
Parameters
----------
inputfile : str
Name of QE input file, which also contains `&inputtddft` section.
commf : object
mpi4py parallel communicator to be sent to Fortran
"""
if inputfile is None : inputfile = self.inputfile
if commf is None : commf = self.commf
#
if self.progress :
qepy.wvfct.get_array_g2kin()
qepy.qepy_tddft_readin(inputfile)
else :
qepy.qepy_tddft_main_initial(inputfile, commf)
qepy.read_file()
qepy.qepy_tddft_main_setup()
[docs] def diagonalize(self, print_level = 2, nscf = False, **kwargs):
"""Diagonalize the Hamiltonian
Parameters
----------
print_level :
The level of output of QE
"""
self.embed.lmovecell = False
self.iter += 1
if self.task == 'optical' :
qepy.qepy_molecule_optical_absorption()
elif nscf :
qepy.qepy_electrons_nscf(print_level, 0)
else :
self.embed.mix_coef = -1.0
qepy.qepy_electrons_scf(print_level, 0)
[docs] def mix(self, mix_coef = 0.7, print_level = 2):
"""Mix the density with the QE density mixing
Parameters
----------
print_level :
The level of output of QE
"""
if self.task == 'optical' : return
self.embed.mix_coef = mix_coef
qepy.qepy_electrons_scf(print_level, 0)
[docs] def check_convergence(self, **kwargs):
"""Check the convergence of the SCF"""
converged = bool(qepy.control_flags.get_conv_elec())
if converged and not self.embed.initial : self.end_scf()
return converged
[docs] def get_scf_error(self, **kwargs):
"""Return the error of the SCF compared to previous cycle"""
if self.embed.iterative :
return self.embed.dnorm
else :
return qepy.control_flags.get_scf_error()
[docs] def get_scf_steps(self, **kwargs):
"""Return the number of SCF steps"""
if self.embed.iterative :
return self.iter
else :
return qepy.control_flags.get_n_scf_steps()
[docs] def scf(self, print_level = 2, maxiter = None, original = False, nscf = False, **kwargs):
"""Run the scf/tddft until converged or reached the maximum number of iterations"""
if maxiter is not None and not self.embed.iterative :
qepy.control_flags.set_niter(maxiter)
if self.task == 'optical' :
qepy.qepy_molecule_optical_absorption()
elif not self.embed.iterative and self.embed.exttype < 2 :
# Use electrons to support hybrid xc functional
return self.electrons(original=original)
elif nscf :
qepy.qepy_electrons_nscf(print_level, 0)
else :
qepy.qepy_electrons_scf(print_level, 0)
return self.embed.etotal
[docs] def non_scf(self, **kwargs):
"""Single "non-selfconsistent" calculation"""
# fix some saved variables from last scf calculations
qepy.control_flags.set_lscf(0)
qepy.control_flags.set_lbfgs(0)
qepy.control_flags.set_lmd(0)
qepy.control_flags.set_lwf(0)
#
qepy.non_scf()
return qepy.ener.get_etot()
[docs] def electrons(self, original = False, **kwargs):
"""Execute original QE routine "electrons" """
if original :
qepy.electrons()
else :
qepy.qepy_electrons()
return qepy.ener.get_etot()
[docs] def end_scf(self, nscf = False, **kwargs):
"""Ends the SCF and cleans the SCF workspace. Only run when in iterative mode (i.e., one cycle at a time)"""
if self.embed.iterative :
if self.task == 'optical' :
self.embed.tddft.finish = True
qepy.qepy_molecule_optical_absorption()
elif nscf :
self.embed.finish = True
qepy.qepy_electrons_nscf(0, 0)
else :
self.embed.finish = True
qepy.qepy_electrons_scf(0, 0)
[docs] def stop(self, exit_status = 0, what = 'all', print_flag = 0, **kwargs):
"""Stop the driver. This must be done anytime a new driver is created.
This method is invoked automatically if a running driver is detected. Only
one driver can run at any given time.
Parameters
----------
exit_status : int
0 : QE will remove it temporary files
print_flag : int
0 : Not print time informations
what : str
see :func:`qepy.driver.Driver.save`.
"""
if self.task == 'optical' :
self.tddft_stop(exit_status, print_flag = print_flag, what = what, **kwargs)
else :
if not self.embed.initial : self.end_scf()
qepy.qepy_stop_run(exit_status, print_flag = print_flag, what = what, finalize = False)
if hasattr(self.fileobj, 'close'): self.fileobj.close()
qepy.qepy_clean_saved()
#
env['DRIVER'] = None
env['STDOUT'] = None
[docs] def tddft_restart(self, istep=None, **kwargs):
"""Restarts the TDDFT from previous interrupted run.
Parameters
----------
istep : int
Start number of steps, just for output.
"""
qepy.qepy_tddft_mod.qepy_cetddft_wfc2rho()
if istep is not None :
self.embed.tddft.istep = istep
[docs] def tddft_stop(self, exit_status = 0, what = 'no', print_flag = 0, **kwargs):
"""Stops TDDFT run"""
if not self.embed.tddft.initial : self.end_scf()
#! Do not save the PW files, otherwise the initial wfcs will be overwritten.
qepy.qepy_stop_run(exit_status, print_flag = print_flag, what = 'no', finalize = False)
qepy.qepy_stop_tddft(exit_status)
[docs] def save(self, what = 'all', **kwargs):
"""
Save the QE data to the disk in original QE files that can be accessed via post-processing
or read with a QEpy driver
Parameters
----------
what : str
* what = 'all' : write xml data file, charge density, wavefunctions
(for final data);
* what = 'config' : write xml data file and charge density; also,
for nks=1, wavefunctions in plain binary format
(see why in comments below). For intermediate
or incomplete results;
* what = 'config-nowf' : write xml data file and charge density only;
(save density);
* what = 'config-init' : write xml data file only excluding final results
(for dry run, can be called at early stages).
see PW/src/punch.f90
"""
qepy.punch(what)
# qepy.close_files(False)
def update_run_options(self, qe_options = {}, **kwargs):
pass
[docs] def get_energy(self, **kwargs):
"""Return the total energy.
Nota bene: Only use for regular QE runs (i.e., not when doing embedding)."""
if abs(qepy.ener.get_etot()) > 1E-16 :
energy = qepy.ener.get_etot()
elif abs(self.embed.etotal) > 1E-16 :
energy = self.embed.etotal
else :
energy = self.calc_energy(**kwargs)
return energy
[docs] def calc_energy(self, **kwargs):
"""Calculate the energy with PW2CASINO of QE.
Use this only if you have a good reason to use it! For example
embedding calculations."""
qepy.qepy_calc_energies()
return self.embed.etotal
[docs] def update_ions(self, positions = None, lattice = None, update = 0, **kwargs):
"""update the ions of QE. This is used for dynamic runs.
Parameters
----------
positions : np.ndarray (n, 3)
positions of ions
lattice : 3x3 matrix
lattice of ions
update : int
- 0 : update everything (default)
- 1 : only update atomic information, not update potential
"""
positions = positions.T
if lattice is not None :
lattice = lattice.T
if not qepy.cellmd.get_lmovecell():
raise ValueError(" Lattice update only works for variable-cell simulations.\n Please restart the QEpy with calculation= 'vc-relax' or 'vc-md'")
qepy.qepy_mod.qepy_update_ions(positions, update, lattice)
else :
qepy.qepy_mod.qepy_update_ions(positions, update)
[docs] def pwscf_restart(self, oldxml=False, starting_pot='file', starting_wfc='file'):
"""Read PW ouput/restart files.
Parameters
----------
oldxml : bool
- True : read the old format xml file (qe<6.4)
- False : read the new format xml file (qe>6.3)
"""
if oldxml :
if not hasattr(qepy, 'oldxml_pw_restart') :
raise AttributeError("Please reinstall the QEpy with 'oldxml=yes'.")
qepy.oldxml_pw_restart.pw_readfile('header')
qepy.oldxml_pw_restart.pw_readfile('reset')
qepy.oldxml_pw_restart.pw_readfile('dim')
qepy.oldxml_pw_restart.pw_readfile('bs')
if qepy.basis.get_starting_pot().strip() != starting_pot :
qepy.basis.set_starting_pot(starting_pot)
qepy.oldxml_potinit()
if qepy.basis.get_starting_wfc().strip() != starting_wfc :
qepy.basis.set_starting_wfc(starting_wfc)
qepy.oldxml_wfcinit()
else :
qepy.qepy_mod.qepy_restart_from_xml()
if qepy.basis.get_starting_pot().strip() != starting_pot :
qepy.basis.set_starting_pot(starting_pot)
qepy.potinit()
if qepy.basis.get_starting_wfc().strip() != starting_wfc :
qepy.basis.set_starting_wfc(starting_wfc)
qepy.wfcinit()
[docs] def create_array(self, gather = True, kind = 'rho'):
"""Returns an empty array in real space.
Nota bene: this is for real-space arrays like the density (rho) and potentials."""
if kind == 'rho' :
nspin = qepy.lsda_mod.get_nspin()
if gather and self.nproc > 1 :
nr = self.get_number_of_grid_points(gather = gather)
if self.is_root :
out = np.zeros((np.prod(nr), nspin), order = 'F')
else :
out = np.zeros((1, nspin), order = 'F')
else :
nnr = self.embed.dfftp.nnr
out = np.zeros((nnr, nspin), order = 'F')
else :
raise ValueError('Only support "rho"')
return out
[docs] def get_density(self, gather = True, out = None):
"""Returns valence pseudodensity array in real space."""
if out is None : out = self.create_array(gather=gather, kind='rho')
qepy.qepy_mod.qepy_get_rho(out, gather = gather)
return out
[docs] def get_core_density(self, gather = True, out = None):
"""Returns core density array in real space."""
if out is None : out = self.create_array(gather=gather, kind='rho')
qepy.qepy_mod.qepy_get_rho_core(out, gather = gather)
return out
[docs] def get_kinetic_energy_density(self, gather = True, out = None):
"""Returns KS kinetic energy density array in real space."""
if out is None : out = self.create_array(gather=gather, kind='rho')
qepy.qepy_mod.qepy_get_tau(out, gather = gather)
return out
[docs] def get_wave_function(self, band=None, kpt=0):
"""Returns wave-function array in real space."""
qepy.qepy_mod.qepy_get_evc(kpt + 1)
nrs = np.zeros(3, dtype = 'int32')
qepy.qepy_mod.qepy_get_grid_smooth(nrs)
if self.is_root :
wf = np.empty(np.prod(nrs), order = 'F', dtype = np.complex128)
else :
wf = np.empty(1, order = 'F', dtype = np.complex128)
if band is None :
band = np.arange(self.get_number_of_bands())
else :
band = np.asarray(band)
if band.ndim == 0 : band = [band]
wfs = []
for ibnd in band :
qepy.qepy_mod.qepy_get_wf(kpt + 1, ibnd + 1, wf)
wfs.append(wf.copy())
return wfs
[docs] def get_dipole_tddft(self):
"""Return the total dipole computed by a TDDFT run.
Nota bene: only available during TDDFT runs."""
# dipole = qepy.qepy_tddft_common.get_array_dipole().copy()
dipole = self.embed.tddft.dipole
return dipole
[docs] def set_external_potential(self, potential, exttype = None, gather = True, extene = None, **kwargs):
"""Set an external potential in addition to the ones already included in the QEpy run
according to the logic enumerated below.
Parameters
----------
potential : (nnr, nspin)
The external potential
exttype : list or int
The type of external potential. It can be a list of name or a integer.
e.g. `exttype = ('localpp', 'xc')` or `exttype = 5`. `external` stands for an
additional external potential.
==== ============================== ===
type potential bin
==== ============================== ===
0 external 000
1 localpp 001
2 hartree 010
4 xc 100
==== ============================== ===
"""
if exttype is not None :
if not isinstance(exttype, int): exttype = self.potname2type(exttype)
self.embed.exttype = exttype
if extene is not None :
self.embed.extene = extene
else :
self.embed.extene = 0.0
#
if potential is None : potential = np.zeros((1, 1))
if potential.ndim != 2 : raise ValueError("The array should be 2-d.")
#
qepy.qepy_mod.qepy_set_extpot(potential, gather = gather)
[docs] def get_output(self):
"""Return the output of QE.
It depends on the `logfile` of the initialization of the driver :
- None : return None.
- str : return all outputs.
- True : It will return the output from last time.
"""
if self.fileobj is not None :
if self.fileobj_interact :
self.fileobj.flush()
self.fileobj.seek(0)
lines = self.fileobj.readlines()
self.fileobj.close()
#
self._init_log()
#
return lines
else :
self.fileobj.seek(0)
return self.fileobj.readlines()
else :
return None
[docs] @gathered
def get_elf(self, gather = True, out = None, **kwargs):
"""Return electron localization function."""
qepy.do_elf(out)
return out
[docs] @gathered
def get_rdg(self, gather = True, out = None, **kwargs):
"""Return reduced density gradient."""
qepy.do_rdg(out)
return out
#-----------------------------------------------------------------------
[docs] @gathered
def get_local_pp(self, gather = True, out = None, **kwargs):
"""Return local component of the pseudopotential."""
for i in range(out.shape[1]):
out[:, i] = qepy.scf.get_array_vltot()
return out
[docs] @gathered
def get_hartree(self, gather = True, out = None, add=False, **kwargs):
"""Return information about Hartree energy:
tuple (potential, energy, total charge)
"""
if not add : out[:] = 0.0
ehart, charge = qepy.v_h(self.embed.rho.of_g[:,0], out)
return out, ehart, charge
[docs] @gathered
def get_exchange_correlation(self, gather = True, out = None, tau=None, **kwargs):
"""Return information about the exchange-correlation:
LDA, GGA: tuple (potential, energy, v*rho)
MGGA: tuple (potential, energy, v*rho, tau)
TODO :
The interface will changed in the new version of QE!
Note :
For metaGGA, only return scattered tau
"""
etxc = vtxc = 0.0
rho_obj = self.embed.rho
rho_core = qepy.scf.get_array_rho_core()
rhog_core = qepy.scf.get_array_rhog_core()
if qepy.funct.dft_is_meta():
if tau is None : tau = out*0.0
qepy.v_xc_meta(rho_obj, rho_core, rhog_core, etxc, vtxc, out, tau)
return out, etxc, vtxc, tau
else :
etxc, vtxc = qepy.v_xc(rho_obj, rho_core, rhog_core, out)
return out, etxc, vtxc
[docs] @gathered
def get_density_functional(self, gather = True, out = None, add = False, **kwargs):
"""Return effective potential information.
Note :
Then final potential is saved in the v_obj
"""
rho_obj = self.embed.rho
rho_core = qepy.scf.get_array_rho_core()
rhog_core = qepy.scf.get_array_rhog_core()
v_obj = self.embed.v
etotefield = 0.0
#
v_obj.of_r[:] = 0.0
ehart, etxc, vtxc, eth, charge = qepy.qepy_v_of_rho(rho_obj, rho_core, rhog_core, etotefield, v_obj)
info = [ehart, etxc, vtxc, eth, etotefield, charge]
if add :
out += v_obj.of_r
else :
out[:] = v_obj.of_r
return out, info
def get_hartree_potential(self, gather = True, out = None, **kwargs):
return self.get_hartree(gather=gather, out=out, **kwargs)[0]
def get_exchange_correlation_potential(self, gather = True, out = None, **kwargs):
return self.get_exchange_correlation(gather=gather, out=out, **kwargs)[0]
def get_density_functional_potential(self, gather = True, out = None, **kwargs):
return self.get_density_functional(gather=gather, out=out, **kwargs)[0]
def get_effective_potential(self, gather = True, out = None, **kwargs):
out = self.get_local_pp(gather=gather, out=out, **kwargs)
out = self.get_density_functional_potential(gather=gather, out=out, add = True, **kwargs)
return out
#-----------------------------------------------------------------------
#-----------------------------------------------------------------------
#ASE Calculator
[docs] def get_potential_energy(self, **kwargs):
"""Return the potential energy."""
return self.get_energy()
[docs] def get_forces(self, icalc = 0, ignore = (), **kwargs):
"""Return the total forces. (n, 3)
Parameters
----------
icalc : int
===== ============================= ===
icalc without bin
===== ============================= ===
0 all 000
1 no ewald 001
2 no localpp 010
4 no nlcc 100
===== ============================= ===
ignore : list
ignore some forces, which does same job as `icalc`.
- ewald (1)
- localpp (2)
- nlcc (4)
"""
if len(ignore) > 0 : icalc = self.forcename2type(ignore)
qepy.qepy_forces(icalc)
forces = qepy.force_mod.get_array_force().T
return forces
[docs] @classmethod
def get_stress(cls, **kwargs):
"""Return the stress (3, 3)."""
stress = np.zeros((3, 3), order='F')
qepy.stress(stress)
return stress
#ASE DFTCalculator
[docs] @classmethod
def get_number_of_bands(cls):
"""Return the number of bands."""
return qepy.wvfct.get_nbnd()
[docs] @classmethod
def get_xc_functional(cls):
"""Return the XC-functional identifier.
'LDA', 'PBE', ..."""
return qepy.funct.get_dft_short().decode("utf-8")
[docs] @classmethod
def get_bz_k_points(cls):
"""Return all the k-points in the 1. Brillouin zone.
The coordinates are relative to reciprocal latice vectors."""
return qepy.klist.get_array_xk()
[docs] @classmethod
def get_number_of_spins(cls):
"""Return the number of spins in the calculation.
Spin-paired calculations: 1, spin-polarized calculation: 2."""
return qepy.lsda_mod.get_nspin()
[docs] @classmethod
def get_spin_polarized(cls):
"""Is it a spin-polarized calculation?"""
return bool(qepy.lsda_mod.get_lsda())
[docs] @classmethod
def get_ibz_k_points(cls):
"""Return k-points in the irreducible part of the Brillouin zone.
The coordinates are relative to reciprocal latice vectors."""
xk = qepy.klist.get_array_xk()[:, :cls.get_number_of_k_points()].T
return xk @ qepy.cell_base.get_array_at()
[docs] @classmethod
def get_k_point_weights(cls):
"""Weights of the k-points.
The sum of all weights is one."""
return qepy.klist.get_array_wk()[:cls.get_number_of_k_points()]
[docs] def get_pseudo_density(self, spin=None, pad=True, gather = True):
"""Return pseudo-density array.
If *spin* is not given, then the total density is returned.
Otherwise, the spin up or down density is returned (spin=0 or
1)."""
density = self.get_density(gather = gather)
if spin is None :
return density.sum(axis=1)
else :
return density[:, spin]
[docs] @classmethod
def get_pseudo_wave_function(cls, band=None, kpt=0, spin=0, broadcast=True,
pad=True):
"""Return pseudo-wave-function array."""
qepy.qepy_mod.qepy_get_evc(kpt + 1)
evc = qepy.wavefunctions.get_array_evc()
if band is None :
return evc
else :
return evc[:, band]
[docs] @classmethod
def get_eigenvalues(cls, kpt=0, spin=0):
"""Return eigenvalue array."""
return qepy.wvfct.get_array_et().T[kpt]
[docs] @classmethod
def get_occupation_numbers(cls, kpt=0, spin=0):
"""Return occupation number array."""
return qepy.wvfct.get_array_wg().T[kpt]
[docs] @classmethod
def get_fermi_level(cls):
"""Return the Fermi level."""
return qepy.ener.get_ef()
# def initial_wannier(self, initialwannier, kpointgrid, fixedstates,
# edf, spin, nbands):
# """Initial guess for the shape of wannier functions.
# Use initial guess for wannier orbitals to determine rotation
# matrices U and C.
# """
# raise NotImplementedError
# def get_wannier_localization_matrix(self, nbands, dirG, kpoint,
# nextkpoint, G_I, spin):
# """Calculate integrals for maximally localized Wannier functions."""
# raise NotImplementedError
[docs] @classmethod
def get_magnetic_moment(cls, **kwargs):
"""Return the total magnetic moment."""
return qepy.lsda_mod.get_magtot()
[docs] @classmethod
def get_number_of_grid_points(cls, gather = True):
"""Return the shape of arrays."""
nr = np.zeros(3, dtype = 'int32')
qepy.qepy_mod.qepy_get_grid(nr, gather)
return nr
#ASE DFTCalculator END
#-----------------------------------------------------------------------
[docs] @classmethod
def get_number_of_k_points(cls):
"""Return the number of kpoints."""
return qepy.klist.get_nkstot()
[docs] @classmethod
def get_volume(cls):
"""Return the volume."""
return qepy.cell_base.get_omega()
[docs] @classmethod
def get_ecutrho(cls):
"""Return the cutoff for density."""
return qepy.gvect.get_ecutrho()
[docs] @classmethod
def get_ions_lattice(cls):
"""Return the matrix of the lattice vectors in Bohrs."""
alat = qepy.cell_base.get_alat()
lattice = qepy.cell_base.get_array_at() * alat
return lattice.T
[docs] @classmethod
def get_ions_positions(cls):
"""Return the cartesian positions of ions in Bohrs."""
alat = qepy.cell_base.get_alat()
pos = qepy.ions_base.get_array_tau().T * alat
return pos
[docs] @classmethod
def get_ions_symbols(cls):
"""Return the symbols of ions."""
ityp = qepy.ions_base.get_array_ityp() - 1
nat = qepy.ions_base.get_nat()
ntyp = qepy.ions_base.get_nsp()
label = qepy.ions_base.get_array_atm().T.view('S3')[:,0].astype('U3')[:ntyp]
label = [x.strip() for x in label]
symbols = []
for i in range(nat):
symbols.append(label[ityp[i]])
return symbols
[docs] @classmethod
def data2field(cls, data, cell = None, grid = None, rank = None):
"""QE data to DFTpy DirectField.
If data is None or small temporary array will return np.zeros(1).
"""
from dftpy.field import DirectField
from dftpy.grid import DirectGrid
#
if data is None or data.size < 8 : return np.zeros(1)
#
if cell is None : cell = cls.get_ions_lattice()
if grid is None : grid = DirectGrid(lattice=cell, nr=cls.get_number_of_grid_points(), ecut=cls.get_ecutrho())
if not rank :
rank = data.shape[1] if data.ndim == 2 else 1
#
if data.size != grid.nnrR*rank :
raise ValueError('The size of data not match the grid,\
please check the data or set another grid', data.size, grid.nnrR*rank)
#
field = DirectField(grid=grid, data=data.ravel(order='C'), order='F', rank=rank)
return field
[docs] @classmethod
def field2data(cls, field, data = None):
"""DFTpy DirectField to QE data.
If the input field is not 3d array, will return np.zeros((1, 1)).
"""
#
if field is None or field.ndim < 3 : return np.zeros((1, 1))
#
ns = field.shape[0] if field.ndim == 4 else 1
if data is None :
nnrR = np.prod(cls.get_number_of_grid_points())
data = np.empty((nnrR, ns))
#
if data.size != field.size :
raise ValueError('The size of field is different with data,\
please check the field or set another data', field.size, data.size)
#
if ns == 1 : field = [field]
for i in range(ns):
data[:, i] = field[i].ravel(order = 'F')
return data
[docs] @classmethod
def get_dftpy_grid(cls, nr = None, cell = None, mp = None, **kwargs):
"""Return the DFTpy DirectGrid from QE."""
from dftpy.grid import DirectGrid
if cell is None : cell = cls.get_ions_lattice()
if nr is None :
nr = cls.get_number_of_grid_points()
ecut = cls.get_ecutrho()
else :
ecut = None
grid = DirectGrid(lattice=cell, nr=nr, ecut=ecut, mp=mp, **kwargs)
return grid
[docs] @classmethod
def get_ase_atoms(cls):
"""Return the atom.Atoms from QE to ASE (using ASE units)."""
from ase.atoms import Atoms
units_Bohr = constants.BOHR_RADIUS_SI * 1E10
#
symbols = cls.get_ions_symbols()
positions = cls.get_ions_positions() * units_Bohr
lattice = cls.get_ions_lattice() * units_Bohr
atoms = Atoms(symbols = symbols, positions = positions, cell = lattice)
return atoms
[docs] @classmethod
def get_dftpy_ions(cls):
"""Return the DFTpy.Ions from QE. (with DFTpy units)"""
from dftpy.ions import Ions
atoms = cls.get_ase_atoms()
return Ions.from_ase(atoms)
[docs] @classmethod
def set_density(cls, density, gather = True, **kwargs):
"""Set density array in real space."""
#
if density is None : density = np.zeros((1, 1))
if density.ndim != 2 : raise ValueError("The array should be 2-d.")
#
qepy.qepy_mod.qepy_set_rho(density, gather = gather)
[docs] @classmethod
def switch_nlpp(cls, nhm=0, nbetam=0, nkb=0, nh=None, **kwargs):
"""Switch on/off the nonlocal part of the pseudopotential"""
nhm_ = qepy.uspp_param.get_nhm()
nbetam_ = qepy.uspp_param.get_nbetam()
nh_ = qepy.uspp_param.get_array_nh().copy()
nkb_ = qepy.uspp.get_nkb()
if nh is None: nh = nh_ * 0
qepy.uspp_param.set_nhm(nhm)
qepy.uspp_param.set_nbetam(nbetam)
qepy.uspp.set_nkb(nkb)
qepy.uspp_param.set_array_nh(nh)
pp_options = {
'nhm' : nhm_,
'nbetam' : nbetam_,
'nh': nh_,
'nkb': nkb_,
}
return pp_options
[docs] @classmethod
def update_exchange_correlation(cls, xc=None, libxc=None, **kwargs):
"""Switch XC on the fly"""
if libxc : xc = None
qepy.qepy_mod.qepy_set_dft(xc)
[docs] @classmethod
def sum_band(cls, occupations = None, **kwargs):
"""Same as sum_band of QE with input occupations:
Parameters
----------
occupations: np.ndarray (nbnd, nk)
occupation numbers
"""
qepy.qepy_mod.qepy_sum_band(occupations)
@staticmethod
def name2type(dictionary, name):
if isinstance(name, int):
value = []
for k, v in dictionary.items():
if name & v == v : value.append(k)
else :
if isinstance(name, str): name = [name]
value = 0
for key in name :
i = dictionary.get(key, None)
if i is None :
raise AttributeError(f"The key '{key}' not in the given dictionary.")
value += i
return value
return value
@classmethod
def potname2type(cls, name):
return cls.name2type(cls.POTNAMES, name)
@classmethod
def forcename2type(cls, name = None):
return cls.name2type(cls.FORCENAMES, name)