Source code for pyscf.scf.uhf

#!/usr/bin/env python
# Copyright 2014-2018 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
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# See the License for the specific language governing permissions and
# limitations under the License.

import time
from functools import reduce
import numpy
import scipy.linalg
from pyscf import lib
from pyscf import gto
from pyscf.lib import logger
from pyscf.scf import hf
from pyscf.scf import chkfile
from pyscf import __config__

WITH_META_LOWDIN = getattr(__config__, 'scf_analyze_with_meta_lowdin', True)
PRE_ORTH_METHOD = getattr(__config__, 'scf_analyze_pre_orth_method', 'ANO')
BREAKSYM = getattr(__config__, 'scf_uhf_init_guess_breaksym', True)
MO_BASE = getattr(__config__, 'MO_BASE', 1)

[docs]def init_guess_by_minao(mol, breaksym=BREAKSYM): '''Generate initial guess density matrix based on ANO basis, then project the density matrix to the basis set defined by ``mol`` Returns: Density matrices, a list of 2D ndarrays for alpha and beta spins ''' dm = hf.init_guess_by_minao(mol) dma = dmb = dm*.5 if breaksym: #remove off-diagonal part of beta DM dmb = numpy.zeros_like(dma) for b0, b1, p0, p1 in mol.aoslice_by_atom(): dmb[p0:p1,p0:p1] = dma[p0:p1,p0:p1] return numpy.array((dma,dmb))
def init_guess_by_1e(mol, breaksym=BREAKSYM): return UHF(mol).init_guess_by_1e(mol, breaksym) def init_guess_by_atom(mol, breaksym=BREAKSYM): dm = hf.init_guess_by_atom(mol) dma = dmb = dm*.5 if breaksym: #Add off-diagonal part for alpha DM dma = mol.intor('int1e_ovlp') * 1e-2 for b0, b1, p0, p1 in mol.aoslice_by_atom(): dma[p0:p1,p0:p1] = dmb[p0:p1,p0:p1] return numpy.array((dma,dmb))
[docs]def init_guess_by_chkfile(mol, chkfile_name, project=None): '''Read SCF chkfile and make the density matrix for UHF initial guess. Kwargs: project : None or bool Whether to project chkfile's orbitals to the new basis. Note when the geometry of the chkfile and the given molecule are very different, this projection can produce very poor initial guess. In PES scanning, it is recommended to swith off project. If project is set to None, the projection is only applied when the basis sets of the chkfile's molecule are different to the basis sets of the given molecule (regardless whether the geometry of the two molecules are different). Note the basis sets are considered to be different if the two molecules are derived from the same molecule with different ordering of atoms. ''' from pyscf.scf import addons chk_mol, scf_rec = chkfile.load_scf(chkfile_name) if project is None: project = not gto.same_basis_set(chk_mol, mol) # Check whether the two molecules are similar def inertia_momentum(mol): im = gto.inertia_momentum(mol._atom, mol.atom_charges(), mol.atom_coords()) return scipy.linalg.eigh(im)[0] if abs(inertia_momentum(mol) - inertia_momentum(chk_mol)).sum() > 0.5: logger.warn(mol, "Large deviations found between the input " "molecule and the molecule from chkfile\n" "Initial guess density matrix may have large error.") if project: s = hf.get_ovlp(mol) def fproj(mo): if project: mo = addons.project_mo_nr2nr(chk_mol, mo, mol) norm = numpy.einsum('pi,pi->i', mo.conj(), mo /= numpy.sqrt(norm) return mo mo = scf_rec['mo_coeff'] mo_occ = scf_rec['mo_occ'] if hasattr(mo[0], 'ndim') and mo[0].ndim == 1: # RHF if numpy.iscomplexobj(mo): raise NotImplementedError('TODO: project DHF orbital to UHF orbital') mo_coeff = fproj(mo) mo_occa = (mo_occ>1e-8).astype(numpy.double) mo_occb = mo_occ - mo_occa dm = make_rdm1([mo_coeff,mo_coeff], [mo_occa,mo_occb]) else: #UHF if hasattr(mo[0][0], 'ndim') and mo[0][0].ndim == 2: # KUHF logger.warn(mol, 'k-point UHF results are found. Density matrix ' 'at Gamma point is used for the molecular SCF initial guess') mo = mo[0] dm = make_rdm1([fproj(mo[0]),fproj(mo[1])], mo_occ) return dm
def get_init_guess(mol, key='minao'): return UHF(mol).get_init_guess(mol, key)
[docs]def make_rdm1(mo_coeff, mo_occ, **kwargs): '''One-particle density matrix Returns: A list of 2D ndarrays for alpha and beta spins ''' mo_a = mo_coeff[0] mo_b = mo_coeff[1] dm_a =*mo_occ[0], mo_a.T.conj()) dm_b =*mo_occ[1], mo_b.T.conj()) # DO NOT make tag_array for DM here because the DM arrays may be modified and # passed to functions like get_jk, get_vxc. These functions may take the tags # (mo_coeff, mo_occ) to compute the potential if tags were found in the DM # arrays and modifications to DM arrays may be ignored. return numpy.array((dm_a,dm_b))
[docs]def get_veff(mol, dm, dm_last=0, vhf_last=0, hermi=1, vhfopt=None): r'''Unrestricted Hartree-Fock potential matrix of alpha and beta spins, for the given density matrix .. math:: V_{ij}^\alpha &= \sum_{kl} (ij|kl)(\gamma_{lk}^\alpha+\gamma_{lk}^\beta) - \sum_{kl} (il|kj)\gamma_{lk}^\alpha \\ V_{ij}^\beta &= \sum_{kl} (ij|kl)(\gamma_{lk}^\alpha+\gamma_{lk}^\beta) - \sum_{kl} (il|kj)\gamma_{lk}^\beta Args: mol : an instance of :class:`Mole` dm : a list of ndarrays A list of density matrices, stored as (alpha,alpha,...,beta,beta,...) Kwargs: dm_last : ndarray or a list of ndarrays or 0 The density matrix baseline. When it is not 0, this function computes the increment of HF potential w.r.t. the reference HF potential matrix. vhf_last : ndarray or a list of ndarrays or 0 The reference HF potential matrix. hermi : int Whether J, K matrix is hermitian | 0 : no hermitian or symmetric | 1 : hermitian | 2 : anti-hermitian vhfopt : A class which holds precomputed quantities to optimize the computation of J, K matrices Returns: :math:`V_{hf} = (V^\alpha, V^\beta)`. :math:`V^\alpha` (and :math:`V^\beta`) can be a list matrices, corresponding to the input density matrices. Examples: >>> import numpy >>> from pyscf import gto, scf >>> mol = gto.M(atom='H 0 0 0; H 0 0 1.1') >>> dmsa = numpy.random.random((3,mol.nao_nr(),mol.nao_nr())) >>> dmsb = numpy.random.random((3,mol.nao_nr(),mol.nao_nr())) >>> dms = numpy.vstack((dmsa,dmsb)) >>> dms.shape (6, 2, 2) >>> vhfa, vhfb = scf.uhf.get_veff(mol, dms, hermi=0) >>> vhfa.shape (3, 2, 2) >>> vhfb.shape (3, 2, 2) ''' dm = numpy.asarray(dm) nao = dm.shape[-1] ddm = dm - numpy.asarray(dm_last) # dm.reshape(-1,nao,nao) to remove first dim, compress (dma,dmb) vj, vk = hf.get_jk(mol, ddm.reshape(-1,nao,nao), hermi=hermi, vhfopt=vhfopt) vj = vj.reshape(dm.shape) vk = vk.reshape(dm.shape) assert(vj.ndim >= 3 and vj.shape[0] == 2) vhf = vj[0] + vj[1] - vk vhf += numpy.asarray(vhf_last) return vhf
def get_fock(mf, h1e=None, s1e=None, vhf=None, dm=None, cycle=-1, diis=None, diis_start_cycle=None, level_shift_factor=None, damp_factor=None): if h1e is None: h1e = mf.get_hcore() if vhf is None: vhf = mf.get_veff(mf.mol, dm) f = h1e + vhf if f.ndim == 2: f = (f, f) if cycle < 0 and diis is None: # Not inside the SCF iteration return f if diis_start_cycle is None: diis_start_cycle = mf.diis_start_cycle if level_shift_factor is None: level_shift_factor = mf.level_shift if damp_factor is None: damp_factor = mf.damp if s1e is None: s1e = mf.get_ovlp() if dm is None: dm = self.make_rdm1() if isinstance(level_shift_factor, (tuple, list, numpy.ndarray)): shifta, shiftb = level_shift_factor else: shifta = shiftb = level_shift_factor if isinstance(damp_factor, (tuple, list, numpy.ndarray)): dampa, dampb = damp_factor else: dampa = dampb = damp_factor if isinstance(dm, numpy.ndarray) and dm.ndim == 2: dm = [dm*.5] * 2 if 0 <= cycle < diis_start_cycle-1 and abs(dampa)+abs(dampb) > 1e-4: f = (hf.damping(s1e, dm[0], f[0], dampa), hf.damping(s1e, dm[1], f[1], dampb)) if diis and cycle >= diis_start_cycle: f = diis.update(s1e, dm, f, mf, h1e, vhf) if abs(shifta)+abs(shiftb) > 1e-4: f = (hf.level_shift(s1e, dm[0], f[0], shifta), hf.level_shift(s1e, dm[1], f[1], shiftb)) return numpy.array(f) def get_occ(mf, mo_energy=None, mo_coeff=None): if mo_energy is None: mo_energy = mf.mo_energy e_idx_a = numpy.argsort(mo_energy[0]) e_idx_b = numpy.argsort(mo_energy[1]) e_sort_a = mo_energy[0][e_idx_a] e_sort_b = mo_energy[1][e_idx_b] nmo = mo_energy[0].size n_a, n_b = mf.nelec mo_occ = numpy.zeros_like(mo_energy) mo_occ[0,e_idx_a[:n_a]] = 1 mo_occ[1,e_idx_b[:n_b]] = 1 if mf.verbose >= logger.INFO and n_a < nmo and n_b > 0 and n_b < nmo: if e_sort_a[n_a-1]+1e-3 > e_sort_a[n_a]: logger.warn(mf, 'alpha nocc = %d HOMO %.15g >= LUMO %.15g', n_a, e_sort_a[n_a-1], e_sort_a[n_a]) else:, ' alpha nocc = %d HOMO = %.15g LUMO = %.15g', n_a, e_sort_a[n_a-1], e_sort_a[n_a]) if e_sort_b[n_b-1]+1e-3 > e_sort_b[n_b]: logger.warn(mf, 'beta nocc = %d HOMO %.15g >= LUMO %.15g', n_b, e_sort_b[n_b-1], e_sort_b[n_b]) else:, ' beta nocc = %d HOMO = %.15g LUMO = %.15g', n_b, e_sort_b[n_b-1], e_sort_b[n_b]) if e_sort_a[n_a-1]+1e-3 > e_sort_b[n_b]: logger.warn(mf, 'system HOMO %.15g >= system LUMO %.15g', e_sort_b[n_a-1], e_sort_b[n_b]) numpy.set_printoptions(threshold=nmo) logger.debug(mf, ' alpha mo_energy =\n%s', mo_energy[0]) logger.debug(mf, ' beta mo_energy =\n%s', mo_energy[1]) numpy.set_printoptions(threshold=1000) if mo_coeff is not None and mf.verbose >= logger.DEBUG: ss, s = mf.spin_square((mo_coeff[0][:,mo_occ[0]>0], mo_coeff[1][:,mo_occ[1]>0]), mf.get_ovlp()) logger.debug(mf, 'multiplicity <S^2> = %.8g 2S+1 = %.8g', ss, s) return mo_occ
[docs]def get_grad(mo_coeff, mo_occ, fock_ao): '''UHF Gradients''' occidxa = mo_occ[0] > 0 occidxb = mo_occ[1] > 0 viridxa = ~occidxa viridxb = ~occidxb ga = reduce(, (mo_coeff[0][:,viridxa].T, fock_ao[0].T, mo_coeff[0][:,occidxa].conj())) gb = reduce(, (mo_coeff[1][:,viridxb].T, fock_ao[1].T, mo_coeff[1][:,occidxb].conj())) return numpy.hstack((ga.ravel(), gb.ravel()))
[docs]def energy_elec(mf, dm=None, h1e=None, vhf=None): '''Electronic energy of Unrestricted Hartree-Fock Returns: Hartree-Fock electronic energy and the 2-electron part contribution ''' if dm is None: dm = mf.make_rdm1() if h1e is None: h1e = mf.get_hcore() if isinstance(dm, numpy.ndarray) and dm.ndim == 2: dm = numpy.array((dm*.5, dm*.5)) if vhf is None: vhf = mf.get_veff(mf.mol, dm) e1 = numpy.einsum('ij,ji', h1e, dm[0]) e1+= numpy.einsum('ij,ji', h1e, dm[1]) e_coul =(numpy.einsum('ij,ji', vhf[0], dm[0]) + numpy.einsum('ij,ji', vhf[1], dm[1])) * .5 logger.debug(mf, 'E1 = %s Ecoul = %s', e1, e_coul.real) return (e1+e_coul).real, e_coul
# mo_a and mo_b are occupied orbitals
[docs]def spin_square(mo, s=1): r'''Spin square and multiplicity of UHF determinant .. math:: S^2 = \frac{1}{2}(S_+ S_- + S_- S_+) + S_z^2 where :math:`S_+ = \sum_i S_{i+}` is effective for all beta occupied orbitals; :math:`S_- = \sum_i S_{i-}` is effective for all alpha occupied orbitals. 1. There are two possibilities for :math:`S_+ S_-` 1) same electron :math:`S_+ S_- = \sum_i s_{i+} s_{i-}`, .. math:: \sum_i \langle UHF|s_{i+} s_{i-}|UHF\rangle = \sum_{pq}\langle p|s_+s_-|q\rangle \gamma_{qp} = n_\alpha 2) different electrons :math:`S_+ S_- = \sum s_{i+} s_{j-}, (i\neq j)`. There are in total :math:`n(n-1)` terms. As a two-particle operator, .. math:: \langle S_+ S_- \rangle = \langle ij|s_+ s_-|ij\rangle - \langle ij|s_+ s_-|ji\rangle = -\langle i^\alpha|j^\beta\rangle \langle j^\beta|i^\alpha\rangle 2. Similarly, for :math:`S_- S_+` 1) same electron .. math:: \sum_i \langle s_{i-} s_{i+}\rangle = n_\beta 2) different electrons .. math:: \langle S_- S_+ \rangle = -\langle i^\beta|j^\alpha\rangle \langle j^\alpha|i^\beta\rangle 3. For :math:`S_z^2` 1) same electron .. math:: \langle s_z^2\rangle = \frac{1}{4}(n_\alpha + n_\beta) 2) different electrons .. math:: &\frac{1}{2}\sum_{ij}(\langle ij|2s_{z1}s_{z2}|ij\rangle -\langle ij|2s_{z1}s_{z2}|ji\rangle) \\ &=\frac{1}{4}(\langle i^\alpha|i^\alpha\rangle \langle j^\alpha|j^\alpha\rangle - \langle i^\alpha|i^\alpha\rangle \langle j^\beta|j^\beta\rangle - \langle i^\beta|i^\beta\rangle \langle j^\alpha|j^\alpha\rangle + \langle i^\beta|i^\beta\rangle \langle j^\beta|j^\beta\rangle) \\ &-\frac{1}{4}(\langle i^\alpha|j^\alpha\rangle \langle j^\alpha|i^\alpha\rangle + \langle i^\beta|j^\beta\rangle\langle j^\beta|i^\beta\rangle) \\ &=\frac{1}{4}(n_\alpha^2 - n_\alpha n_\beta - n_\beta n_\alpha + n_\beta^2) -\frac{1}{4}(n_\alpha + n_\beta) \\ &=\frac{1}{4}((n_\alpha-n_\beta)^2 - (n_\alpha+n_\beta)) In total .. math:: \langle S^2\rangle &= \frac{1}{2} (n_\alpha-\sum_{ij}\langle i^\alpha|j^\beta\rangle \langle j^\beta|i^\alpha\rangle +n_\beta -\sum_{ij}\langle i^\beta|j^\alpha\rangle\langle j^\alpha|i^\beta\rangle) + \frac{1}{4}(n_\alpha-n_\beta)^2 \\ Args: mo : a list of 2 ndarrays Occupied alpha and occupied beta orbitals Kwargs: s : ndarray AO overlap Returns: A list of two floats. The first is the expectation value of S^2. The second is the corresponding 2S+1 Examples: >>> mol = gto.M(atom='O 0 0 0; H 0 0 1; H 0 1 0', basis='ccpvdz', charge=1, spin=1, verbose=0) >>> mf = scf.UHF(mol) >>> mf.kernel() -75.623975516256706 >>> mo = (mf.mo_coeff[0][:,mf.mo_occ[0]>0], mf.mo_coeff[1][:,mf.mo_occ[1]>0]) >>> print('S^2 = %.7f, 2S+1 = %.7f' % spin_square(mo, mol.intor('int1e_ovlp_sph'))) S^2 = 0.7570150, 2S+1 = 2.0070027 ''' mo_a, mo_b = mo nocc_a = mo_a.shape[1] nocc_b = mo_b.shape[1] s = reduce(, (mo_a.T.conj(), s, mo_b)) ssxy = (nocc_a+nocc_b) * .5 - numpy.einsum('ij,ij->', s.conj(), s) ssz = (nocc_b-nocc_a)**2 * .25 ss = (ssxy + ssz).real s = numpy.sqrt(ss+.25) - .5 return ss, s*2+1
[docs]def analyze(mf, verbose=logger.DEBUG, with_meta_lowdin=WITH_META_LOWDIN, **kwargs): '''Analyze the given SCF object: print orbital energies, occupancies; print orbital coefficients; Mulliken population analysis; Dipole moment ''' from pyscf.lo import orth from import dump_mat mo_energy = mf.mo_energy mo_occ = mf.mo_occ mo_coeff = mf.mo_coeff log = logger.new_logger(mf, verbose) if log.verbose >= logger.NOTE: log.note('**** MO energy ****') log.note(' alpha | beta alpha | beta') for i in range(mo_occ.shape[1]): log.note('MO #%-3d energy= %-18.15g | %-18.15g occ= %g | %g', i+MO_BASE, mo_energy[0][i], mo_energy[1][i], mo_occ[0][i], mo_occ[1][i]) ovlp_ao = mf.get_ovlp() if log.verbose >= logger.DEBUG: label = mf.mol.ao_labels() if with_meta_lowdin: log.debug(' ** MO coefficients (expansion on meta-Lowdin AOs) for alpha spin **') orth_coeff = orth.orth_ao(mf.mol, 'meta_lowdin', s=ovlp_ao) c_inv =, ovlp_ao) dump_mat.dump_rec(mf.stdout,[0]), label, start=MO_BASE, **kwargs) log.debug(' ** MO coefficients (expansion on meta-Lowdin AOs) for beta spin **') dump_mat.dump_rec(mf.stdout,[1]), label, start=MO_BASE, **kwargs) else: log.debug(' ** MO coefficients (expansion on AOs) for alpha spin **') dump_mat.dump_rec(mf.stdout, mo_coeff[0], label, start=MO_BASE, **kwargs) log.debug(' ** MO coefficients (expansion on AOs) for beta spin **') dump_mat.dump_rec(mf.stdout, mo_coeff[1], label, start=MO_BASE, **kwargs) dm = mf.make_rdm1(mo_coeff, mo_occ) if with_meta_lowdin: return (mf.mulliken_meta(mf.mol, dm, s=ovlp_ao, verbose=log), mf.dip_moment(mf.mol, dm, verbose=log)) else: return (mf.mulliken_pop(mf.mol, dm, s=ovlp_ao, verbose=log), mf.dip_moment(mf.mol, dm, verbose=log))
[docs]def mulliken_pop(mol, dm, s=None, verbose=logger.DEBUG): '''Mulliken population analysis ''' if s is None: s = hf.get_ovlp(mol) log = logger.new_logger(mol, verbose) if isinstance(dm, numpy.ndarray) and dm.ndim == 2: dm = numpy.array((dm*.5, dm*.5)) pop_a = numpy.einsum('ij,ji->i', dm[0], s).real pop_b = numpy.einsum('ij,ji->i', dm[1], s).real' ** Mulliken pop alpha | beta **') for i, s in enumerate(mol.ao_labels()):'pop of %s %10.5f | %-10.5f', s, pop_a[i], pop_b[i])'In total %10.5f | %-10.5f', sum(pop_a), sum(pop_b)) log.note(' ** Mulliken atomic charges ( Nelec_alpha | Nelec_beta ) **') nelec_a = numpy.zeros(mol.natm) nelec_b = numpy.zeros(mol.natm) for i, s in enumerate(mol.ao_labels(fmt=None)): nelec_a[s[0]] += pop_a[i] nelec_b[s[0]] += pop_b[i] chg = mol.atom_charges() - (nelec_a + nelec_b) for ia in range(mol.natm): symb = mol.atom_symbol(ia) log.note('charge of %d%s = %10.5f ( %10.5f %10.5f )', ia, symb, chg[ia], nelec_a[ia], nelec_b[ia]) return (pop_a,pop_b), chg
[docs]def mulliken_meta(mol, dm_ao, verbose=logger.DEBUG, pre_orth_method=PRE_ORTH_METHOD, s=None): '''Mulliken population analysis, based on meta-Lowdin AOs. ''' from pyscf.lo import orth if s is None: s = hf.get_ovlp(mol) log = logger.new_logger(mol, verbose) if isinstance(dm_ao, numpy.ndarray) and dm_ao.ndim == 2: dm_ao = numpy.array((dm_ao*.5, dm_ao*.5)) c = orth.restore_ao_character(mol, pre_orth_method) orth_coeff = orth.orth_ao(mol, 'meta_lowdin', pre_orth_ao=c, s=s) c_inv =, s) dm_a = reduce(, (c_inv, dm_ao[0], c_inv.T.conj())) dm_b = reduce(, (c_inv, dm_ao[1], c_inv.T.conj())) log.note(' ** Mulliken pop alpha/beta on meta-lowdin orthogonal AOs **') return mulliken_pop(mol, (dm_a,dm_b), numpy.eye(orth_coeff.shape[0]), log)
mulliken_pop_meta_lowdin_ao = mulliken_meta
[docs]def canonicalize(mf, mo_coeff, mo_occ, fock=None): '''Canonicalization diagonalizes the UHF Fock matrix within occupied, virtual subspaces separatedly (without change occupancy). ''' mo_occ = numpy.asarray(mo_occ) assert(mo_occ.ndim == 2) if fock is None: dm = mf.make_rdm1(mo_coeff, mo_occ) fock = mf.get_hcore() + mf.get_veff(mf.mol, dm) occidxa = mo_occ[0] == 1 occidxb = mo_occ[1] == 1 viridxa = mo_occ[0] == 0 viridxb = mo_occ[1] == 0 def eig_(fock, mo_coeff, idx, es, cs): if numpy.count_nonzero(idx) > 0: orb = mo_coeff[:,idx] f1 = reduce(, (orb.T.conj(), fock, orb)) e, c = scipy.linalg.eigh(f1) es[idx] = e cs[:,idx] =, c) mo = numpy.empty_like(mo_coeff) mo_e = numpy.empty(mo_occ.shape) eig_(fock[0], mo_coeff[0], occidxa, mo_e[0], mo[0]) eig_(fock[0], mo_coeff[0], viridxa, mo_e[0], mo[0]) eig_(fock[1], mo_coeff[1], occidxb, mo_e[1], mo[1]) eig_(fock[1], mo_coeff[1], viridxb, mo_e[1], mo[1]) return mo_e, mo
[docs]def det_ovlp(mo1, mo2, occ1, occ2, ovlp): r''' Calculate the overlap between two different determinants. It is the product of single values of molecular orbital overlap matrix. .. math:: S_{12} = \langle \Psi_A | \Psi_B \rangle = (\mathrm{det}\mathbf{U}) (\mathrm{det}\mathbf{V^\dagger})\prod\limits_{i=1}\limits^{2N} \lambda_{ii} where :math:`\mathbf{U}, \mathbf{V}, \lambda` are unitary matrices and single values generated by single value decomposition(SVD) of the overlap matrix :math:`\mathbf{O}` which is the overlap matrix of two sets of molecular orbitals: .. math:: \mathbf{U}^\dagger \mathbf{O} \mathbf{V} = \mathbf{\Lambda} Args: mo1, mo2 : 2D ndarrays Molecualr orbital coefficients occ1, occ2: 2D ndarrays occupation numbers Return: A list: the product of single values: float x_a, x_b: 1D ndarrays :math:`\mathbf{U} \mathbf{\Lambda}^{-1} \mathbf{V}^\dagger` They are used to calculate asymmetric density matrix ''' if not numpy.array_equal(occ1, occ2): raise RuntimeError('Electron numbers are not equal. Electronic coupling does not exist.') c1_a = mo1[0][:, occ1[0]>0] c1_b = mo1[1][:, occ1[1]>0] c2_a = mo2[0][:, occ2[0]>0] c2_b = mo2[1][:, occ2[1]>0] o_a = reduce(, (c1_a.conj().T, ovlp, c2_a)) o_b = reduce(, (c1_b.conj().T, ovlp, c2_b)) u_a, s_a, vt_a = numpy.linalg.svd(o_a) u_b, s_b, vt_b = numpy.linalg.svd(o_b) x_a = reduce(, (u_a*numpy.reciprocal(s_a), vt_a)) x_b = reduce(, (u_b*numpy.reciprocal(s_b), vt_b)) return*, numpy.array((x_a, x_b))
[docs]def make_asym_dm(mo1, mo2, occ1, occ2, x): r'''One-particle asymmetric density matrix Args: mo1, mo2 : 2D ndarrays Molecualr orbital coefficients occ1, occ2: 2D ndarrays Occupation numbers x: 2D ndarrays :math:`\mathbf{U} \mathbf{\Lambda}^{-1} \mathbf{V}^\dagger`. See also :func:`det_ovlp` Return: A list of 2D ndarrays for alpha and beta spin Examples: >>> mf1 = scf.UHF(gto.M(atom='H 0 0 0; F 0 0 1.3', basis='ccpvdz')).run() >>> mf2 = scf.UHF(gto.M(atom='H 0 0 0; F 0 0 1.4', basis='ccpvdz')).run() >>> s = gto.intor_cross('int1e_ovlp_sph', mf1.mol, mf2.mol) >>> det, x = det_ovlp(mf1.mo_coeff, mf1.mo_occ, mf2.mo_coeff, mf2.mo_occ, s) >>> adm = make_asym_dm(mf1.mo_coeff, mf1.mo_occ, mf2.mo_coeff, mf2.mo_occ, x) >>> adm.shape (2, 19, 19) ''' mo1_a = mo1[0][:, occ1[0]>0] mo1_b = mo1[1][:, occ1[1]>0] mo2_a = mo2[0][:, occ2[0]>0] mo2_b = mo2[1][:, occ2[1]>0] dm_a = reduce(, (mo1_a, x[0], mo2_a.T.conj())) dm_b = reduce(, (mo1_b, x[1], mo2_b.T.conj())) return numpy.array((dm_a, dm_b))
dip_moment = hf.dip_moment
[docs]class UHF(hf.SCF): __doc__ = hf.SCF.__doc__ + ''' Attributes for UHF: nelec : (int, int) If given, freeze the number of (alpha,beta) electrons to the given value. level_shift : number or two-element list level shift (in Eh) for alpha and beta Fock if two-element list is given. Examples: >>> mol = gto.M(atom='O 0 0 0; H 0 0 1; H 0 1 0', basis='ccpvdz', charge=1, spin=1, verbose=0) >>> mf = scf.UHF(mol) >>> mf.kernel() -75.623975516256706 >>> print('S^2 = %.7f, 2S+1 = %.7f' % mf.spin_square()) S^2 = 0.7570150, 2S+1 = 2.0070027 ''' def __init__(self, mol): hf.SCF.__init__(self, mol) # self.mo_coeff => [mo_a, mo_b] # self.mo_occ => [mo_occ_a, mo_occ_b] # self.mo_energy => [mo_energy_a, mo_energy_b] self.nelec = None @property def nelec(self): if self._nelec is not None: return self._nelec else: return self.mol.nelec @nelec.setter def nelec(self, x): self._nelec = x @property def nelectron_alpha(self): return self.nelec[0] @nelectron_alpha.setter def nelectron_alpha(self, x): logger.warn(self, 'WARN: Attribute .nelectron_alpha is deprecated. ' 'Set .nelec instead') #raise RuntimeError('API updates') self.nelec = (x, self.mol.nelectron-x) def dump_flags(self): hf.SCF.dump_flags(self), 'number electrons alpha = %d beta = %d', *self.nelec) def eig(self, fock, s): e_a, c_a = self._eigh(fock[0], s) e_b, c_b = self._eigh(fock[1], s) return (e_a,e_b), (c_a,c_b) get_fock = get_fock get_occ = get_occ def get_grad(self, mo_coeff, mo_occ, fock=None): if fock is None: dm1 = self.make_rdm1(mo_coeff, mo_occ) fock = self.get_hcore(self.mol) + self.get_veff(self.mol, dm1) return get_grad(mo_coeff, mo_occ, fock) @lib.with_doc(make_rdm1.__doc__)
[docs] def make_rdm1(self, mo_coeff=None, mo_occ=None, **kwargs): if mo_coeff is None: mo_coeff = self.mo_coeff if mo_occ is None: mo_occ = self.mo_occ return make_rdm1(mo_coeff, mo_occ, **kwargs)
energy_elec = energy_elec
[docs] def init_guess_by_minao(self, mol=None, breaksym=BREAKSYM): '''Initial guess in terms of the overlap to minimal basis.''' if mol is None: mol = self.mol if mol.spin != 0: # For spin polarized system, there is no need to manually break spin symmetry breaksym = False return init_guess_by_minao(mol, breaksym)
def init_guess_by_atom(self, mol=None, breaksym=BREAKSYM): if mol is None: mol = self.mol if mol.spin != 0: # For spin polarized system, there is no need to manually break spin symmetry breaksym = False return init_guess_by_atom(mol, breaksym) def init_guess_by_1e(self, mol=None, breaksym=BREAKSYM): if mol is None: mol = self.mol, 'Initial guess from hcore.') h1e = self.get_hcore(mol) s1e = self.get_ovlp(mol) mo_energy, mo_coeff = self.eig((h1e,h1e), s1e) mo_occ = self.get_occ(mo_energy, mo_coeff) dma, dmb = self.make_rdm1(mo_coeff, mo_occ) if mol.spin == 0 and breaksym: #remove off-diagonal part of beta DM dmb = numpy.zeros_like(dma) for b0, b1, p0, p1 in mol.aoslice_by_atom(): dmb[p0:p1,p0:p1] = dma[p0:p1,p0:p1] return numpy.array((dma,dmb)) def init_guess_by_chkfile(self, chkfile=None, project=None): if chkfile is None: chkfile = self.chkfile return init_guess_by_chkfile(self.mol, chkfile, project=project)
[docs] def get_jk(self, mol=None, dm=None, hermi=1): '''Coulomb (J) and exchange (K) Args: dm : a list of 2D arrays or a list of 3D arrays (alpha_dm, beta_dm) or (alpha_dms, beta_dms) ''' if mol is None: mol = self.mol if dm is None: dm = self.make_rdm1() if self._eri is not None or mol.incore_anyway or self._is_mem_enough(): if self._eri is None: self._eri = mol.intor('int2e', aosym='s8') vj, vk = hf.dot_eri_dm(self._eri, dm, hermi) else: vj, vk = hf.SCF.get_jk(self, mol, dm, hermi) return numpy.asarray(vj), numpy.asarray(vk)
[docs] def get_veff(self, mol=None, dm=None, dm_last=0, vhf_last=0, hermi=1): if mol is None: mol = self.mol if dm is None: dm = self.make_rdm1() if isinstance(dm, numpy.ndarray) and dm.ndim == 2: dm = numpy.asarray((dm*.5,dm*.5)) if (self._eri is not None or not self.direct_scf or mol.incore_anyway or self._is_mem_enough()): vj, vk = self.get_jk(mol, dm, hermi) vhf = vj[0] + vj[1] - vk else: ddm = numpy.asarray(dm) - numpy.asarray(dm_last) vj, vk = self.get_jk(mol, ddm, hermi) vhf = vj[0] + vj[1] - vk vhf += numpy.asarray(vhf_last) return vhf
def analyze(self, verbose=None, with_meta_lowdin=WITH_META_LOWDIN, **kwargs): if verbose is None: verbose = self.verbose return analyze(self, verbose, with_meta_lowdin, **kwargs) def mulliken_pop(self, mol=None, dm=None, s=None, verbose=logger.DEBUG): if mol is None: mol = self.mol if dm is None: dm = self.make_rdm1() if s is None: s = self.get_ovlp(mol) return mulliken_pop(mol, dm, s=s, verbose=verbose) def mulliken_meta(self, mol=None, dm=None, verbose=logger.DEBUG, pre_orth_method=PRE_ORTH_METHOD, s=None): if mol is None: mol = self.mol if dm is None: dm = self.make_rdm1() if s is None: s = self.get_ovlp(mol) return mulliken_meta(mol, dm, s=s, verbose=verbose, pre_orth_method=pre_orth_method) @lib.with_doc(spin_square.__doc__)
[docs] def spin_square(self, mo_coeff=None, s=None): if mo_coeff is None: mo_coeff = (self.mo_coeff[0][:,self.mo_occ[0]>0], self.mo_coeff[1][:,self.mo_occ[1]>0]) if s is None: s = self.get_ovlp() return spin_square(mo_coeff, s)
canonicalize = canonicalize @lib.with_doc(det_ovlp.__doc__)
[docs] def det_ovlp(self, mo1, mo2, occ1, occ2, ovlp=None): if ovlp is None: ovlp = self.get_ovlp() return det_ovlp(mo1, mo2, occ1, occ2, ovlp)
[docs] def make_asym_dm(self, mo1, mo2, occ1, occ2, x): return make_asym_dm(mo1, mo2, occ1, occ2, x)
def _finalize(self): ss, s = self.spin_square() if self.converged: logger.note(self, 'converged SCF energy = %.15g ' '<S^2> = %.8g 2S+1 = %.8g', self.e_tot, ss, s) else: logger.note(self, 'SCF not converged.') logger.note(self, 'SCF energy = %.15g after %d cycles ' '<S^2> = %.8g 2S+1 = %.8g', self.e_tot, self.max_cycle, ss, s) return self
[docs] def convert_from_(self, mf): '''Create UHF object based on the RHF/ROHF object''' from pyscf.scf import addons return addons.convert_to_uhf(mf, out=self)
[docs] def stability(self, internal=getattr(__config__, 'scf_stability_internal', True), external=getattr(__config__, 'scf_stability_external', False), verbose=None): ''' Stability analysis for RHF/RKS method. See also pyscf.scf.stability.uhf_stability function. Args: mf : UHF or UKS object Kwargs: internal : bool Internal stability, within the UHF space. external : bool External stability. Including the UHF -> GHF and real -> complex stability analysis. Returns: New orbitals that are more close to the stable condition. The return value includes two set of orbitals. The first corresponds to the internal stablity and the second corresponds to the external stability. ''' from pyscf.scf.stability import uhf_stability return uhf_stability(self, internal, external, verbose)
def nuc_grad_method(self): from pyscf.grad import uhf return uhf.Gradients(self)
class HF1e(UHF): def scf(self, *args):, '\n'), '******** 1 electron system ********') self.converged = True h1e = self.get_hcore(self.mol) s1e = self.get_ovlp(self.mol) self.mo_energy, self.mo_coeff = self.eig([h1e]*2, s1e) self.mo_occ = self.get_occ(self.mo_energy, self.mo_coeff) self.e_tot = self.mo_energy[0][self.mo_occ[0]>0][0] + self.mol.energy_nuc() self._finalize() return self.e_tot def spin_square(self, mo_coeff=None, s=None): return .75, 2 del(WITH_META_LOWDIN, PRE_ORTH_METHOD, BREAKSYM)