#!/usr/bin/env python
# Copyright 2014-2020 The PySCF Developers. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Author: Xing Zhang <zhangxing.nju@gmail.com>
#
import numpy as np
from pyscf import __config__
from pyscf import lib
from pyscf.lib import logger
from pyscf.pbc.lib import kpts as libkpts
from pyscf.pbc.scf import khf, khf_ksymm
from pyscf.pbc.dft import gen_grid, multigrid
from pyscf.pbc.dft import rks, krks
[docs]
@lib.with_doc(krks.get_veff.__doc__)
def get_veff(ks, cell=None, dm=None, dm_last=0, vhf_last=0, hermi=1,
kpts=None, kpts_band=None):
if cell is None: cell = ks.cell
if dm is None: dm = ks.make_rdm1()
if kpts is None: kpts = ks.kpts
if isinstance(kpts, np.ndarray):
return krks.get_veff(ks, cell, dm, dm_last, vhf_last, hermi, kpts, kpts_band)
t0 = (logger.process_clock(), logger.perf_counter())
ground_state = kpts_band is None
if kpts_band is None:
kpts_band = kpts.kpts_ibz
ni = ks._numint
if isinstance(ni, multigrid.MultiGridNumInt):
if ks.do_nlc():
raise NotImplementedError(f'MultiGrid for NLC functional {ks.xc} + {ks.nlc}')
j_in_xc = ni.xc_with_j
else:
ks.initialize_grids(cell, dm, kpts)
j_in_xc = False
max_memory = ks.max_memory - lib.current_memory()[0]
n, exc, vxc = ni.nr_rks(cell, ks.grids, ks.xc, dm, 0, hermi,
kpts=kpts, kpts_band=kpts_band,
max_memory=max_memory)
logger.info(ks, 'nelec by numeric integration = %s', n)
if ks.do_nlc():
if ni.libxc.is_nlc(ks.xc):
xc = ks.xc
else:
assert ni.libxc.is_nlc(ks.nlc)
xc = ks.nlc
n, enlc, vnlc = ni.nr_nlc_vxc(cell, ks.nlcgrids, xc, dm,
0, hermi, kpts, max_memory=max_memory)
exc += enlc
vxc += vnlc
logger.info(ks, 'nelec with nlc grids = %s', n)
t0 = logger.timer(ks, 'vxc', *t0)
weight = kpts.weights_ibz
vj, vk = krks._get_jk(ks, cell, dm, hermi, kpts, kpts_band, with_j=not j_in_xc)
if j_in_xc:
ecoul = vxc.ecoul
else:
vxc += vj
ecoul = None
if ground_state:
ecoul = np.einsum('K,Kij,Kji', weight, dm, vj) * .5
if ni.libxc.is_hybrid_xc(ks.xc):
vxc -= .5 * vk
if ground_state:
exc -= np.einsum('K,Kij,Kji', weight, dm, vk).real * .25
vxc = lib.tag_array(vxc, ecoul=ecoul, exc=exc, vj=None, vk=None)
logger.timer(ks, 'veff', *t0)
return vxc
[docs]
class KsymAdaptedKRKS(krks.KRKS, khf_ksymm.KRHF):
get_veff = get_veff
kpts = khf_ksymm.KsymAdaptedKSCF.kpts
get_ovlp = khf_ksymm.KsymAdaptedKSCF.get_ovlp
get_hcore = khf_ksymm.KsymAdaptedKSCF.get_hcore
get_jk = khf_ksymm.KsymAdaptedKSCF.get_jk
get_occ = khf_ksymm.KsymAdaptedKSCF.get_occ
init_guess_by_chkfile = khf_ksymm.KsymAdaptedKSCF.init_guess_by_chkfile
dump_chk = khf_ksymm.KsymAdaptedKSCF.dump_chk
eig = khf_ksymm.KsymAdaptedKSCF.eig
get_orbsym = khf_ksymm.KsymAdaptedKSCF.get_orbsym
orbsym = khf_ksymm.KsymAdaptedKSCF.orbsym
_finalize = khf_ksymm.KsymAdaptedKSCF._finalize
get_init_guess = khf_ksymm.KRHF.get_init_guess
def __init__(self, cell, kpts=libkpts.KPoints(), xc='LDA,VWN',
exxdiv=getattr(__config__, 'pbc_scf_SCF_exxdiv', 'ewald'),
**kwargs):
khf_ksymm.KRHF.__init__(self, cell, kpts, exxdiv=exxdiv, **kwargs)
rks.KohnShamDFT.__init__(self, xc)
[docs]
def dump_flags(self, verbose=None):
khf_ksymm.KRHF.dump_flags(self, verbose)
rks.KohnShamDFT.dump_flags(self, verbose)
return self
[docs]
def energy_elec(self, dm_kpts=None, h1e_kpts=None, vhf=None):
if h1e_kpts is None: h1e_kpts = self.get_hcore(self.cell, self.kpts)
if dm_kpts is None: dm_kpts = self.make_rdm1()
if vhf is None or getattr(vhf, 'ecoul', None) is None:
vhf = self.get_veff(self.cell, dm_kpts)
weight = self.kpts.weights_ibz
e1 = np.einsum('k,kij,kji', weight, h1e_kpts, dm_kpts)
ecoul = vhf.ecoul
exc = vhf.exc
tot_e = e1 + ecoul + exc
self.scf_summary['e1'] = e1.real
self.scf_summary['coul'] = ecoul.real
self.scf_summary['exc'] = exc.real
logger.debug(self, 'E1 = %s Ecoul = %s Exc = %s', e1, ecoul, exc)
if khf.CHECK_COULOMB_IMAG and abs(ecoul.imag) > self.cell.precision*10:
logger.warn(self, "Coulomb energy has imaginary part %s. "
"Coulomb integrals (e-e, e-N) may not converge !",
ecoul.imag)
return tot_e.real, ecoul.real + exc.real
[docs]
def to_hf(self):
'''Convert to KRHF object.'''
from pyscf.pbc.scf.khf_ksymm import KRHF
return self._transfer_attrs_(KRHF(self.cell, self.kpts))
KRKS = KsymAdaptedKRKS
