#!/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: Qiming Sun <osirpt.sun@gmail.com>
#
import sys
import numpy
from pyscf.lib import logger
from pyscf import gto
from pyscf import ao2mo
from pyscf.data import elements
from pyscf.lib.exceptions import BasisNotFoundError
from pyscf.df.autoaux import autoaux, autoabs
from pyscf import __config__
DFBASIS = getattr(__config__, 'df_addons_aug_etb_beta', 'weigend')
ETB_BETA = getattr(__config__, 'df_addons_aug_dfbasis', 2.0)
FIRST_ETB_ELEMENT = getattr(__config__, 'df_addons_aug_start_at', 36) # 'Rb'
# TODO: Switch to other default scheme for auxiliary basis generation.
# The auxiliary basis set generated by version 2.6 (and earlier) lacks compact
# functions. It may cause higher errors in ERI integrals.
USE_VERSION_26_AUXBASIS = True
# Obtained from http://www.psicode.org/psi4manual/master/basissets_byfamily.html
DEFAULT_AUXBASIS = {
# AO basis JK-fit MP2-fit
'ccpvdz' : ('cc-pvdz-jkfit' , 'cc-pvdz-ri' ),
'ccpvdpdz' : ('cc-pvdz-jkfit' , 'cc-pvdz-ri' ),
'augccpvdz' : ('aug-cc-pvdz-jkfit' , 'aug-cc-pvdz-ri' ),
'augccpvdpdz' : ('aug-cc-pvdz-jkfit' , 'aug-cc-pvdz-ri' ),
'ccpvtz' : ('cc-pvtz-jkfit' , 'cc-pvtz-ri' ),
'augccpvtz' : ('aug-cc-pvtz-jkfit' , 'aug-cc-pvtz-ri' ),
'ccpvqz' : ('cc-pvqz-jkfit' , 'cc-pvqz-ri' ),
'augccpvqz' : ('aug-cc-pvqz-jkfit' , 'aug-cc-pvqz-ri' ),
'ccpv5z' : ('cc-pv5z-jkfit' , 'cc-pv5z-ri' ),
'augccpv5z' : ('aug-cc-pv5z-jkfit' , 'aug-cc-pv5z-ri' ),
'def2svp' : ('def2-svp-jkfit' , 'def2-svp-ri' ),
'def2svpd' : ('def2-svp-jkfit' , 'def2-svpd-ri' ),
'def2tzvp' : ('def2-tzvp-jkfit' , 'def2-tzvp-ri' ),
'def2tzvpd' : ('def2-tzvp-jkfit' , 'def2-tzvpd-ri' ),
'def2tzvpp' : ('def2-tzvpp-jkfit' , 'def2-tzvpp-ri' ),
'def2tzvppd' : ('def2-tzvpp-jkfit' , 'def2-tzvppd-ri' ),
'def2qzvp' : ('def2-qzvp-jkfit' , 'def2-qzvp-ri' ),
'def2qzvpd' : ('def2-qzvp-jkfit' , None ),
'def2qzvpp' : ('def2-qzvpp-jkfit' , 'def2-qzvpp-ri' ),
'def2qzvppd' : ('def2-qzvpp-jkfit' , 'def2-qzvppd-ri' ),
'sto3g' : ('def2-svp-jkfit' , 'def2-svp-ri' ),
'321g' : ('def2-svp-jkfit' , 'def2-svp-ri' ),
'631g' : ('cc-pvdz-jkfit' , 'cc-pvdz-ri' ),
'631+g' : ('heavy-aug-cc-pvdz-jkfit', 'heavyaug-cc-pvdz-ri'),
'631++g' : ('aug-cc-pvdz-jkfit' , 'aug-cc-pvdz-ri' ),
'6311g' : ('cc-pvtz-jkfit' , 'cc-pvtz-ri' ),
'6311+g' : ('heavy-aug-cc-pvtz-jkfit', 'heavyaug-cc-pvtz-ri'),
'6311++g' : ('aug-cc-pvtz-jkfit' , 'aug-cc-pvtz-ri' ),
}
[docs]
class load(ao2mo.load):
'''load 3c2e integrals from hdf5 file. It can be used in the context
manager:
with load(cderifile) as eri:
print(eri.shape)
'''
def __init__(self, eri, dataname='j3c'):
ao2mo.load.__init__(self, eri, dataname)
def _aug_etb_element(nuc_charge, basis, beta):
l_max = max(b[0] for b in basis)
emin_by_l = [1e99] * (l_max+1)
emax_by_l = [0] * (l_max+1)
for b in basis:
l = b[0]
if isinstance(b[1], int):
e_c = numpy.array(b[2:])
else:
e_c = numpy.array(b[1:])
es = e_c[:,0]
cs = e_c[:,1:]
es = es[abs(cs).max(axis=1) > 1e-3]
emax_by_l[l] = max(es.max(), emax_by_l[l])
emin_by_l[l] = min(es.min(), emin_by_l[l])
conf = elements.CONFIGURATION[nuc_charge]
# 1: H - Be, 2: B - Ca, 3: Sc - La, 4: Ce -
max_shells = 4 - conf.count(0)
if USE_VERSION_26_AUXBASIS:
# This is the method that version 2.6 (and earlier) generates auxiliary
# basis. It estimates the exponents ranges by geometric average.
# This method is not recommended because it tends to generate diffuse
# functions. Important compact functions might be improperly excluded.
l_max = min(l_max, max_shells)
l_max_aux = l_max * 2
l_max1 = l_max + 1
emin_by_l = numpy.array(emin_by_l[:l_max1])
emax_by_l = numpy.array(emax_by_l[:l_max1])
emax = (emax_by_l[:,None] * emax_by_l) ** .5 * 2
emin = (emin_by_l[:,None] * emin_by_l) ** .5 * 2
else:
# Using normal average, more auxiliary functions, especially compact
# functions, will be generated.
l_max_aux = min(l_max, max_shells) * 2
l_max1 = l_max + 1
emin_by_l = numpy.array(emin_by_l)
emax_by_l = numpy.array(emax_by_l)
emax = emax_by_l[:,None] + emax_by_l
emin = emin_by_l[:,None] + emin_by_l
liljsum = numpy.arange(l_max1)[:,None] + numpy.arange(l_max1)
emax_by_l = numpy.array([emax[liljsum==ll].max() for ll in range(l_max_aux+1)])
emin_by_l = numpy.array([emin[liljsum==ll].min() for ll in range(l_max_aux+1)])
ns = numpy.log((emax_by_l+emin_by_l)/emin_by_l) / numpy.log(beta)
etb = []
for l, n in enumerate(numpy.ceil(ns).astype(int)):
if n > 0:
etb.append((l, n, emin_by_l[l], beta))
return etb
[docs]
def aug_etb_for_dfbasis(mol, dfbasis=DFBASIS, beta=ETB_BETA,
start_at=FIRST_ETB_ELEMENT):
'''augment weigend basis with even-tempered gaussian basis
exps = alpha*beta^i for i = 1..N
'''
nuc_start = gto.charge(start_at)
uniq_atoms = {a[0] for a in mol._atom}
newbasis = {}
for symb in uniq_atoms:
nuc_charge = gto.charge(symb)
if nuc_charge < nuc_start:
newbasis[symb] = dfbasis
else:
basis = mol._basis[symb]
etb = _aug_etb_element(nuc_charge, basis, beta)
if etb:
newbasis[symb] = gto.expand_etbs(etb)
for l, n, emin, beta in etb:
logger.info(mol, 'l = %d, exps = %s * %g^n for n = 0..%d',
l, emin, beta, n-1)
else:
raise RuntimeError(f'Failed to generate even-tempered auxbasis for {symb}')
return newbasis
[docs]
def aug_etb(mol, beta=ETB_BETA):
'''To generate the even-tempered auxiliary Gaussian basis'''
return aug_etb_for_dfbasis(mol, beta=beta, start_at=0)
[docs]
def make_auxbasis(mol, mp2fit=False):
'''Depending on the orbital basis, generating even-tempered Gaussians or
the optimized auxiliary basis defined in DEFAULT_AUXBASIS
'''
uniq_atoms = {a[0] for a in mol._atom}
if isinstance(mol.basis, str):
_basis = {a: mol.basis for a in uniq_atoms}
elif 'default' in mol.basis:
default_basis = mol.basis['default']
_basis = {a: default_basis for a in uniq_atoms}
_basis.update(mol.basis)
del (_basis['default'])
else:
_basis = mol._basis or {}
auxbasis = {}
for k in _basis:
if isinstance(_basis[k], str):
balias = gto.basis._format_basis_name(_basis[k])
if gto.basis._is_pople_basis(balias):
balias = balias.split('g')[0] + 'g'
if balias in DEFAULT_AUXBASIS:
if mp2fit:
auxb = DEFAULT_AUXBASIS[balias][1]
else:
auxb = DEFAULT_AUXBASIS[balias][0]
if auxb is not None:
try:
# Test if basis auxb for element k is available
gto.basis.load(auxb, k)
except BasisNotFoundError:
pass
else:
auxbasis[k] = auxb
logger.info(mol, 'Default auxbasis %s is used for %s %s',
auxb, k, _basis[k])
if len(auxbasis) != len(_basis):
# Some AO basis not found in DEFAULT_AUXBASIS
auxbasis, auxdefault = aug_etb(mol), auxbasis
auxbasis.update(auxdefault)
aux_etb = set(auxbasis) - set(auxdefault)
if aux_etb:
logger.warn(mol, 'Even tempered Gaussians are generated as '
'DF auxbasis for %s', ' '.join(aux_etb))
for k in aux_etb:
logger.debug(mol, ' ETB auxbasis for %s %s', k, auxbasis[k])
return auxbasis
# TODO: add auxbasis keyword etb and auto
[docs]
def make_auxmol(mol, auxbasis=None):
'''Generate a fake Mole object which uses the density fitting auxbasis as
the basis sets. If auxbasis is not specified, the optimized auxiliary fitting
basis set will be generated according to the rules recorded in
pyscf.df.addons.DEFAULT_AUXBASIS. If the optimized auxiliary basis is not
available (either not specified in DEFAULT_AUXBASIS or the basis set of the
required elements not defined in the optimized auxiliary basis),
even-tempered Gaussian basis set will be generated.
See also the paper JCTC, 13, 554 about generating auxiliary fitting basis.
Kwargs:
auxbasis : str, list, tuple
Similar to the input of orbital basis in Mole object.
'''
pmol = mol.copy(deep=False)
if auxbasis is None:
auxbasis = make_auxbasis(mol)
pmol.basis = auxbasis
if isinstance(auxbasis, (str, list, tuple)):
uniq_atoms = {a[0] for a in mol._atom}
_basis = {a: auxbasis for a in uniq_atoms}
else:
assert isinstance(auxbasis, dict)
if 'default' in auxbasis:
uniq_atoms = {a[0] for a in mol._atom}
_basis = {a: auxbasis['default'] for a in uniq_atoms}
_basis.update(auxbasis)
del (_basis['default'])
else:
_basis = auxbasis
pmol._basis = pmol.format_basis(_basis)
# Note: To pass parameters like gauge origin, rsh-omega to auxmol,
# mol._env[:PTR_ENV_START] must be copied to auxmol._env
pmol._atm, pmol._bas, pmol._env = \
pmol.make_env(mol._atom, pmol._basis, mol._env[:gto.PTR_ENV_START])
pmol._built = True
logger.debug(mol, 'num shells = %d, num cGTOs = %d',
pmol.nbas, pmol.nao_nr())
return pmol
del (DFBASIS, ETB_BETA, FIRST_ETB_ELEMENT)
