# coding: utf-8
# Copyright (c) Pymatgen Development Team.
# Distributed under the terms of the MIT License.
from __future__ import division, unicode_literals
"""
This module contains the main object used to identify the coordination environments in a given structure.
"""
__author__ = "David Waroquiers"
__copyright__ = "Copyright 2012, The Materials Project"
__credits__ = "Geoffroy Hautier"
__version__ = "2.0"
__maintainer__ = "David Waroquiers"
__email__ = "david.waroquiers@gmail.com"
__date__ = "Feb 20, 2016"
import itertools
import logging
import time
from numpy.linalg import svd
from numpy.linalg import norm
from numpy import transpose
from pymatgen.core.structure import Structure
from pymatgen.core.lattice import Lattice
from pymatgen.symmetry.analyzer import SpacegroupAnalyzer
from pymatgen.analysis.bond_valence import BVAnalyzer
import numpy as np
from random import shuffle
from pymatgen.analysis.chemenv.utils.coordination_geometry_utils import \
vectorsToMatrix, rotateCoords, Plane
from pymatgen.analysis.chemenv.utils.coordination_geometry_utils import \
matrixMultiplication
from pymatgen.analysis.chemenv.utils.coordination_geometry_utils import \
collinear, separation_in_list
from pymatgen.analysis.chemenv.utils.coordination_geometry_utils import \
sort_separation
from pymatgen.analysis.chemenv.coordination_environments.coordination_geometries import \
AllCoordinationGeometries
from pymatgen.analysis.chemenv.coordination_environments.coordination_geometries import \
EXPLICIT_PERMUTATIONS
from pymatgen.analysis.chemenv.coordination_environments.coordination_geometries import \
SEPARATION_PLANE
from pymatgen.analysis.chemenv.coordination_environments.structure_environments import \
ChemicalEnvironments
from pymatgen.analysis.chemenv.coordination_environments.structure_environments import \
StructureEnvironments
from pymatgen.analysis.chemenv.coordination_environments.structure_environments import \
LightStructureEnvironments
from pymatgen.analysis.chemenv.coordination_environments.voronoi import \
DetailedVoronoiContainer
from pymatgen.analysis.chemenv.coordination_environments.chemenv_strategies import \
MultiWeightsChemenvStrategy
debug = False
DIST_TOLERANCES = [0.02, 0.05, 0.1, 0.2, 0.3]
[docs]class AbstractGeometry(object):
"""
Class used to describe a geometry (perfect or distorted)
"""
def __init__(self, central_site=None, bare_coords=None,
centering_type='standard',
include_central_site_in_centroid=False):
"""
Constructor for the abstract geometry
:param central_site: Coordinates of the central site
:param bare_coords: Coordinates of the neighbors of the central site
:param centering_type: How to center the abstract geometry
:param include_central_site_in_centroid: When the centering is on the centroid, the central site is included
if this parameter is set to True.
:raise: ValueError if the parameters are not consistent
"""
self.bare_centre = np.array(central_site)
self.bare_points_without_centre = [np.array(bc) for bc in bare_coords]
self.bare_points_with_centre = [np.array(central_site)]
self.bare_points_with_centre.extend(
[np.array(bc) for bc in bare_coords])
self.centroid_without_centre = np.mean(self.bare_points_without_centre,
axis=0)
self.centroid_with_centre = np.mean(self.bare_points_with_centre,
axis=0)
self._points_wcs_csc = [pp - self.bare_centre for pp in
self.bare_points_with_centre]
self._points_wocs_csc = [pp - self.bare_centre for pp in
self.bare_points_without_centre]
self._points_wcs_ctwcc = [pp - self.centroid_with_centre for pp in
self.bare_points_with_centre]
self._points_wocs_ctwcc = [pp - self.centroid_with_centre for pp in
self.bare_points_without_centre]
self._points_wcs_ctwocc = [pp - self.centroid_without_centre for pp in
self.bare_points_with_centre]
self._points_wocs_ctwocc = [pp - self.centroid_without_centre for pp in
self.bare_points_without_centre]
self.centering_type = centering_type
self.include_central_site_in_centroid = include_central_site_in_centroid
self.bare_central_site = central_site
if centering_type == 'standard':
if len(bare_coords) < 5:
if include_central_site_in_centroid:
raise ValueError(
"The center is the central site, no calculation of the centroid,"
"variable include_central_site_in_centroid should be set to False")
if central_site is None:
raise ValueError(
"Centering_type is central_site, the central site should be given")
self.centre = np.array(central_site)
else:
total = np.zeros(3, np.float)
for pp in bare_coords:
total += pp
if include_central_site_in_centroid:
if central_site is None:
raise ValueError(
"The centroid includes the central site but no central site is given")
total += central_site
self.centre = total / (np.float(len(bare_coords)) + 1.0)
else:
self.centre = total / np.float(len(bare_coords))
elif centering_type == 'central_site':
if include_central_site_in_centroid:
raise ValueError(
"The center is the central site, no calculation of the centroid,"
"variable include_central_site_in_centroid should be set to False")
if central_site is None:
raise ValueError(
"Centering_type is central_site, the central site should be given")
self.centre = np.array(central_site)
elif centering_type == 'centroid':
total = np.zeros(3, np.float)
for pp in bare_coords:
total += pp
if include_central_site_in_centroid:
if central_site is None:
raise ValueError(
"The centroid includes the central site but no central site is given")
total += central_site
self.centre = total / (np.float(len(bare_coords)) + 1.0)
else:
self.centre = total / np.float(len(bare_coords))
self._bare_coords = bare_coords
self._coords = list()
for ip, pp in enumerate(bare_coords):
self._coords.append(np.array(pp) - self.centre)
self.central_site = self.bare_central_site - self.centre
self.coords = self._coords
self.bare_coords = self._bare_coords
def __str__(self):
"""
String representation of the AbstractGeometry
:return: String representation of the AbstractGeometry
"""
outs = [
'\nAbstract Geometry with {n} points :'.format(n=len(self.coords))]
for pp in self.coords:
outs.append(' {pp}'.format(pp=pp))
if self.centering_type == 'standard':
if self.include_central_site_in_centroid:
outs.append(
'Points are referenced to the central site for coordination numbers < 5'
' and to the centroid (calculated with the central site) for coordination'
' numbers >= 5 : {c}\n'.format(c=self.centre))
else:
outs.append(
'Points are referenced to the central site for coordination numbers < 5'
' and to the centroid (calculated without the central site) for coordination'
' numbers >= 5 : {c}\n'.format(c=self.centre))
elif self.centering_type == 'central_site':
outs.append(
'Points are referenced to the central site : {c}\n'.format(
c=self.centre))
elif self.centering_type == 'centroid':
if self.include_central_site_in_centroid:
outs.append('Points are referenced to the centroid'
' (calculated with the central site) :\n {c}\n'.format(
c=self.centre))
else:
outs.append('Points are referenced to the centroid'
' (calculated without the central site) :\n {c}\n'.format(
c=self.centre))
return '\n'.join(outs)
[docs] @classmethod
def from_cg(cls, cg, centering_type='standard',
include_central_site_in_centroid=False):
central_site = cg.get_central_site()
bare_coords = [np.array(pt, np.float) for pt in cg.points]
return cls(central_site=central_site, bare_coords=bare_coords,
centering_type=centering_type,
include_central_site_in_centroid=include_central_site_in_centroid)
[docs] def points_wcs_csc(self, permutation=None):
if permutation is None:
return list(self._points_wcs_csc)
perm = [0]
perm.extend([pp + 1 for pp in permutation])
return [self._points_wcs_csc[ii] for ii in perm]
[docs] def points_wocs_csc(self, permutation=None):
if permutation is None:
return list(self._points_wocs_csc)
return [self._points_wocs_csc[ii] for ii in permutation]
[docs] def points_wcs_ctwcc(self, permutation=None):
if permutation is None:
return list(self._points_wcs_ctwcc)
perm = [0]
perm.extend([pp + 1 for pp in permutation])
return [self._points_wcs_ctwcc[ii] for ii in perm]
[docs] def points_wocs_ctwcc(self, permutation=None):
if permutation is None:
return list(self._points_wocs_ctwcc)
return [self._points_wocs_ctwcc[ii] for ii in permutation]
[docs] def points_wcs_ctwocc(self, permutation=None):
if permutation is None:
return list(self._points_wcs_ctwocc)
perm = [0]
perm.extend([pp + 1 for pp in permutation])
return [self._points_wcs_ctwocc[ii] for ii in perm]
[docs] def points_wocs_ctwocc(self, permutation=None):
if permutation is None:
return list(self._points_wocs_ctwocc)
return [self._points_wocs_ctwocc[ii] for ii in permutation]
[docs]def symmetry_measure(points_distorted, points_perfect):
"""
Computes the continuous symmetry measure of the (distorted) set of points "points_distorted" with respect to the
(perfect) set of points "points_perfect".
:param points_distorted: List of points describing a given (distorted) polyhedron for which the symmetry measure
has to be computed with respect to the model polyhedron described by the list of points
"points_perfect".
:param points_perfect: List of "perfect" points describing a given model polyhedron.
:return: The continuous symmetry measure of the distorted polyhedron with respect to the perfect polyhedron
"""
# When there is only one point, the symmetry measure is 0.0 by definition
if len(points_distorted) == 1:
return {'symmetry_measure': 0.0, 'scaling_factor': None, 'rotation_matrix': None}
# Find the rotation matrix that aligns the distorted points to the perfect points in a least-square sense.
rot = find_rotation(points_distorted=points_distorted,
points_perfect=points_perfect)
# Find the scaling factor between the distorted points and the perfect points in a least-square sense.
scaling_factor, rotated_coords = find_scaling_factor(
points_distorted=points_distorted,
points_perfect=points_perfect,
rot=rot)
# Compute the continuous symmetry measure [see Eq. 1 in Pinsky et al., Inorganic Chemistry 37, 5575 (1998)]
num = 0.0
denom = 0.0
for ip, pp in enumerate(points_perfect):
rotated_coords[ip] = scaling_factor * rotated_coords[ip]
diff = (pp - rotated_coords[ip])
num += np.sum(diff * diff)
denom += np.sum(pp * pp)
return {'symmetry_measure': num / denom * 100.0, 'scaling_factor': scaling_factor, 'rotation_matrix': rot}
[docs]def find_rotation(points_distorted, points_perfect):
"""
This finds the rotation matrix that aligns the (distorted) set of points "points_distorted" with respect to the
(perfect) set of points "points_perfect" in a least-square sense.
:param points_distorted: List of points describing a given (distorted) polyhedron for which the rotation that
aligns these points in a least-square sense to the set of perfect points "points_perfect"
:param points_perfect: List of "perfect" points describing a given model polyhedron.
:return: The rotation matrix
"""
isexact = True
for ip, pp in enumerate(points_distorted):
if not np.allclose(pp, points_perfect[ip]):
isexact = False
break
if isexact:
rot = np.eye(3)
return rot
H = np.zeros([3, 3], np.float)
for ip, pp in enumerate(points_distorted):
H += vectorsToMatrix(pp, points_perfect[ip])
[U, S, Vt] = svd(H)
rot = matrixMultiplication(transpose(Vt), transpose(U))
return rot
[docs]def find_scaling_factor(points_distorted, points_perfect, rot):
"""
This finds the scaling factor between the (distorted) set of points "points_distorted" and the
(perfect) set of points "points_perfect" in a least-square sense.
:param points_distorted: List of points describing a given (distorted) polyhedron for which the scaling factor has
to be obtained.
:param points_perfect: List of "perfect" points describing a given model polyhedron.
:param rot: The rotation matrix
:return: The scaling factor between the two structures and the rotated set of (distorted) points.
"""
rotated_coords = rotateCoords(points_distorted, rot)
num = np.sum([np.dot(rc, points_perfect[ii]) for ii, rc in
enumerate(rotated_coords)])
denom = np.sum([np.dot(rc, rc) for rc in rotated_coords])
return num / denom, rotated_coords
[docs]class LocalGeometryFinder(object):
"""
Main class used to find the local environments in a structure
"""
DEFAULT_BVA_DISTANCE_SCALE_FACTOR = 1.0
BVA_DISTANCE_SCALE_FACTORS = {'experimental': 1.0, 'GGA_relaxed': 1.015,
'LDA_relaxed': 0.995}
DEFAULT_SPG_ANALYZER_OPTIONS = {'symprec': 1e-3, 'angle_tolerance': 5}
STRUCTURE_REFINEMENT_NONE = 'none'
STRUCTURE_REFINEMENT_REFINED = 'refined'
STRUCTURE_REFINEMENT_SYMMETRIZED = 'symmetrized'
DEFAULT_STRATEGY = MultiWeightsChemenvStrategy.stats_article_weights_parameters()
def __init__(self, permutations_safe_override=False,
plane_ordering_override=True, debug_level=None,
plane_safe_permutations=False,
only_symbols=None):
"""
Constructor for the LocalGeometryFinder, initializes the list of coordination geometries
:param permutations_safe_override: If set to True, all permutations are tested (very time-consuming for large
coordination numbers!)
:param plane_ordering_override: If set to False, the ordering of the points in the plane is disabled
"""
self.allcg = AllCoordinationGeometries(
permutations_safe_override=permutations_safe_override,
only_symbols=only_symbols)
self.permutations_safe_override = permutations_safe_override
self.plane_ordering_override = plane_ordering_override
self.plane_safe_permutations = plane_safe_permutations
self.setup_parameters(centering_type='centroid',
include_central_site_in_centroid=True,
bva_distance_scale_factor=None,
structure_refinement=self.STRUCTURE_REFINEMENT_NONE)
[docs] def setup_parameters(self, centering_type='standard',
include_central_site_in_centroid=False,
bva_distance_scale_factor=None,
structure_refinement=STRUCTURE_REFINEMENT_REFINED,
spg_analyzer_options=None):
"""
Setup of the parameters for the coordination geometry finder. A reference point for the geometries has to be
chosen. This can be the centroid of the structure (including or excluding the atom for which the coordination
geometry is looked for) or the atom itself. In the 'standard' centering_type, the reference point is the central
atom for coordination numbers 1, 2, 3 and 4 and the centroid for coordination numbers > 4.
:param centering_type: Type of the reference point (centering) 'standard', 'centroid' or 'central_site'
:param include_central_site_in_centroid: In case centering_type is 'centroid', the central site is included if
this value is set to True.
:param bva_distance_scale_factor: Scaling factor for the bond valence analyzer (this might be different whether
the structure is an experimental one, an LDA or a GGA relaxed one, or any
other relaxation scheme (where under- or over-estimation of bond lengths
is known).
:param structure_refinement: Refinement of the structure. Can be "none", "refined" or "symmetrized".
:param spg_analyzer_options: Options for the SpaceGroupAnalyzer (dictionary specifying "symprec"
and "angle_tolerance". See pymatgen's SpaceGroupAnalyzer for more information.
"""
self.centering_type = centering_type
self.include_central_site_in_centroid = include_central_site_in_centroid
if bva_distance_scale_factor is not None:
self.bva_distance_scale_factor = bva_distance_scale_factor
else:
self.bva_distance_scale_factor = self.DEFAULT_BVA_DISTANCE_SCALE_FACTOR
self.structure_refinement = structure_refinement
if spg_analyzer_options is None:
self.spg_analyzer_options = self.DEFAULT_SPG_ANALYZER_OPTIONS
else:
self.spg_analyzer_options = spg_analyzer_options
[docs] def setup_parameter(self, parameter, value):
"""
Setup of one specific parameter to the given value. The other parameters are unchanged. See setup_parameters
method for the list of possible parameters
:param parameter: Parameter to setup/update
:param value: Value of the parameter
"""
self.__dict__[parameter] = value
[docs] def setup_structure(self, structure):
"""
Sets up the structure for which the coordination geometries have to be identified. The structure is analyzed
with the space group analyzer and a refined structure is used
:param structure: A pymatgen Structure
:param
"""
self.initial_structure = structure.copy()
if self.structure_refinement == self.STRUCTURE_REFINEMENT_NONE:
self.structure = structure.copy()
self.spg_analyzer = None
self.symmetrized_structure = None
else:
self.spg_analyzer = SpacegroupAnalyzer(self.initial_structure,
symprec=
self.spg_analyzer_options[
'symprec'],
angle_tolerance=
self.spg_analyzer_options[
'angle_tolerance'])
if self.structure_refinement == self.STRUCTURE_REFINEMENT_REFINED:
self.structure = self.spg_analyzer.get_refined_structure()
self.symmetrized_structure = None
elif self.structure_refinement == self.STRUCTURE_REFINEMENT_SYMMETRIZED:
self.structure = self.spg_analyzer.get_refined_structure()
self.spg_analyzer_refined = SpacegroupAnalyzer(self.structure,
symprec=
self.spg_analyzer_options[
'symprec'],
angle_tolerance=
self.spg_analyzer_options
[
'angle_tolerance'])
self.symmetrized_structure = self.spg_analyzer_refined.get_symmetrized_structure()
[docs] def get_structure(self):
"""
Returns the pymatgen Structure that has been setup for the identification of geometries (the initial one
might have been refined/symmetrized using the SpaceGroupAnalyzer).
:return: The pymatgen Structure that has been setup for the identification of geometries (the initial one
might have been refined/symmetrized using the SpaceGroupAnalyzer).
"""
return self.structure
[docs] def set_structure(self, lattice, species, coords, coords_are_cartesian):
"""
Sets up the pymatgen structure for which the coordination geometries have to be identified starting from the
lattice, the species and the coordinates
:param lattice: The lattice of the structure
:param species: The species on the sites
:param coords: The coordinates of the sites
:param coords_are_cartesian: If set to True, the coordinates are given in cartesian coordinates
"""
self.setup_structure(
Structure(lattice, species, coords, coords_are_cartesian))
[docs] def compute_coordination_environments(self, structure, indices=None, only_cations=True, strategy=DEFAULT_STRATEGY,
valences='bond-valence-analysis', initial_structure_environments=None):
self.setup_structure(structure=structure)
if valences == 'bond-valence-analysis':
bva = BVAnalyzer()
try:
vals = bva.get_valences(structure=structure)
except ValueError:
vals = 'undefined'
else:
if valences == 'undefined':
vals = valences
else:
if len(valences) != len(structure):
raise ValueError('Valences do not match the number of sites in the structure')
vals = valences
# TODO: add something to compute only the neighbors sets needed for the strategy.
se = self.compute_structure_environments(only_cations=only_cations, only_indices=indices, valences=vals,
initial_structure_environments=initial_structure_environments)
lse = LightStructureEnvironments.from_structure_environments(strategy=strategy, structure_environments=se)
return lse.coordination_environments
[docs] def compute_structure_environments(self,
excluded_atoms=None,
only_atoms=None,
only_cations=True,
only_indices=None,
maximum_distance_factor=None,
minimum_angle_factor=None,
max_cn=None,
min_cn=None,
only_symbols=None,
valences='undefined',
additional_conditions=None,
info=None,
timelimit=None,
initial_structure_environments=None,
recompute=None):
"""
Computes and returns the StructureEnvironments object containing all the information about the coordination
environments in the structure
:param excluded_atoms: Atoms for which the coordination geometries does not have to be identified
:param only_atoms: If not set to None, atoms for which the coordination geometries have to be identified
:return: The StructureEnvironments object containing all the information about the coordination
environments in the structure
"""
time_init = time.clock()
if info is None:
info = {}
info.update({'local_geometry_finder':
{'parameters':
{'centering_type': self.centering_type,
'include_central_site_in_centroid': self.include_central_site_in_centroid,
'structure_refinement': self.structure_refinement,
'spg_analyzer_options': self.spg_analyzer_options
}
}
})
if only_symbols is not None:
self.allcg = AllCoordinationGeometries(
permutations_safe_override=self.permutations_safe_override,
only_symbols=only_symbols)
self.valences = valences
# Get a list of indices of unequivalent sites from the initial structure
self.equivalent_sites = [[site] for site in self.structure]
self.struct_sites_to_irreducible_site_list_map = list(
range(len(self.structure)))
self.sites_map = list(range(len(self.structure)))
indices = list(range(len(self.structure)))
# Get list of unequivalent sites with valence >= 0
if only_cations and self.valences != 'undefined':
sites_indices = [isite for isite in indices if
self.valences[isite] >= 0]
else:
sites_indices = [isite for isite in indices]
# Include atoms that are in the list of "only_atoms" if it is provided
if only_atoms is not None:
sites_indices = [isite for isite in sites_indices
if any([at in [sp.symbol for sp in self.structure[
isite].species_and_occu]
for at in only_atoms])]
# Exclude atoms that are in the list of excluded atoms
if excluded_atoms:
sites_indices = [isite for isite in sites_indices
if not any([at in [sp.symbol for sp in
self.structure[
isite].species_and_occu]
for at in excluded_atoms])]
if only_indices is not None:
sites_indices = [isite for isite in indices if
isite in only_indices]
# Get the VoronoiContainer for the sites defined by their indices (sites_indices)
logging.info('Getting DetailedVoronoiContainer')
self.detailed_voronoi = DetailedVoronoiContainer(self.structure,
isites=sites_indices,
valences=self.valences,
maximum_distance_factor=maximum_distance_factor,
minimum_angle_factor=minimum_angle_factor,
additional_conditions=additional_conditions)
logging.info('DetailedVoronoiContainer has been set up')
# Initialize the StructureEnvironments object (either from initial_structure_environments or from scratch)
if initial_structure_environments is not None:
se = initial_structure_environments
if se.structure != self.structure:
raise ValueError('Structure is not the same in initial_structure_environments')
if se.voronoi != self.detailed_voronoi:
if self.detailed_voronoi.is_close_to(se.voronoi):
self.detailed_voronoi = se.voronoi
else:
raise ValueError('Detailed Voronoi is not the same in initial_structure_environments')
se.info = info
else:
se = StructureEnvironments(voronoi=self.detailed_voronoi, valences=self.valences,
sites_map=self.sites_map, equivalent_sites=self.equivalent_sites,
ce_list=[None]*len(self.structure), structure=self.structure,
info=info)
# Set up the coordination numbers that have to be computed based on min_cn, max_cn and possibly the settings
# for an update (argument "recompute") of an existing StructureEnvironments
if min_cn is None:
min_cn = 1
if max_cn is None:
max_cn = 13
all_cns = range(min_cn, max_cn+1)
do_recompute = False
if recompute is not None:
if 'cns' in recompute:
cns_to_recompute = recompute['cns']
all_cns = list(set(all_cns).intersection(cns_to_recompute))
do_recompute = True
# Variables used for checking timelimit
max_time_one_site = 0.0
breakit = False
# Loop on all the sites
for isite in range(len(self.structure)):
if isite not in sites_indices:
logging.info(' ... in site #{:d}/{:d} ({}) : '
'skipped'.format(isite, len(self.structure),
self.structure[isite].species_string))
continue
if breakit:
logging.info(' ... in site #{:d}/{:d} ({}) : '
'skipped (timelimit)'.format(isite, len(self.structure),
self.structure[isite].species_string))
continue
logging.info(' ... in site #{:d}/{:d} ({})'.format(isite, len(self.structure),
self.structure[isite].species_string))
t1 = time.clock()
se.init_neighbors_sets(isite=isite, additional_conditions=additional_conditions, valences=valences)
to_add_from_hints = []
for cn, nb_sets in se.neighbors_sets[isite].items():
if cn not in all_cns:
continue
for inb_set, nb_set in enumerate(nb_sets):
logging.debug(' ... getting environments for nb_set ({:d}, {:d})'.format(cn, inb_set))
ce = self.update_nb_set_environments(se=se, isite=isite, cn=cn, inb_set=inb_set, nb_set=nb_set,
recompute=do_recompute)
for cg_symbol, cg_dict in ce:
cg = self.allcg[cg_symbol]
# Get possibly missing neighbors sets
if cg.neighbors_sets_hints is not None:
logging.debug(' ... getting hints from cg with mp_symbol "{}" ...'.format(cg_symbol))
hints_info = {'csm': cg_dict['symmetry_measure'],
'nb_set': nb_set,
'permutation': cg_dict['permutation']}
for nb_sets_hints in cg.neighbors_sets_hints:
suggested_nb_set_voronoi_indices = nb_sets_hints.hints(hints_info)
for inew, new_nb_set_voronoi_indices in enumerate(suggested_nb_set_voronoi_indices):
logging.debug(' hint # {:d}'.format(inew))
new_nb_set = se.NeighborsSet(structure=se.structure, isite=isite,
detailed_voronoi=se.voronoi,
site_voronoi_indices=new_nb_set_voronoi_indices,
sources={'origin': 'nb_set_hints',
'hints_type': nb_sets_hints.hints_type,
'suggestion_index': inew,
'cn_map_source': [cn, inb_set],
'cg_source_symbol': cg_symbol})
cn_new_nb_set = len(new_nb_set)
if max_cn is not None and cn_new_nb_set > max_cn:
continue
if min_cn is not None and cn_new_nb_set < min_cn:
continue
if new_nb_set in [ta['new_nb_set'] for ta in to_add_from_hints]:
has_nb_set = True
elif not cn_new_nb_set in se.neighbors_sets[isite]:
has_nb_set = False
else:
has_nb_set = new_nb_set in se.neighbors_sets[isite][cn_new_nb_set]
if not has_nb_set:
to_add_from_hints.append({'isite': isite,
'new_nb_set': new_nb_set,
'cn_new_nb_set': cn_new_nb_set})
logging.debug(' => to be computed'.format(inew))
else:
logging.debug(' => already present'.format(inew))
logging.debug(' ... getting environments for nb_sets added from hints')
for missing_nb_set_to_add in to_add_from_hints:
se.add_neighbors_set(isite=isite, nb_set=missing_nb_set_to_add['new_nb_set'])
for missing_nb_set_to_add in to_add_from_hints:
isite_new_nb_set = missing_nb_set_to_add['isite']
cn_new_nb_set = missing_nb_set_to_add['cn_new_nb_set']
new_nb_set = missing_nb_set_to_add['new_nb_set']
inew_nb_set = se.neighbors_sets[isite_new_nb_set][cn_new_nb_set].index(new_nb_set)
logging.debug(' ... getting environments for nb_set ({:d}, {:d}) - '
'from hints'.format(cn_new_nb_set, inew_nb_set))
self.update_nb_set_environments(se=se,
isite=isite_new_nb_set,
cn=cn_new_nb_set,
inb_set=inew_nb_set,
nb_set=new_nb_set)
t2 = time.clock()
if timelimit is not None:
time_elapsed = t2 - time_init
time_left = timelimit - time_elapsed
if time_left < 2.0 * max_time_one_site:
breakit = True
max_time_one_site = max(max_time_one_site, t2 - t1)
logging.info(' ... computed in {:.2f} seconds'.format(t2 - t1))
time_end = time.clock()
logging.info(' ... compute_structure_environments ended in {:.2f} seconds'.format(time_end-time_init))
return se
[docs] def update_nb_set_environments(self, se, isite, cn, inb_set, nb_set, recompute=False):
ce = se.get_coordination_environments(isite=isite, cn=cn, nb_set=nb_set)
if ce is not None and not recompute:
return ce
ce = ChemicalEnvironments()
neighb_coords = nb_set.neighb_coords
self.setup_local_geometry(isite, coords=neighb_coords)
cncgsm = self.get_coordination_symmetry_measures()
for cg in cncgsm:
other_csms = {
'csm_wocs_ctwocc': cncgsm[cg]['csm_wocs_ctwocc'],
'csm_wocs_ctwcc': cncgsm[cg]['csm_wocs_ctwcc'],
'csm_wocs_csc': cncgsm[cg]['csm_wocs_csc'],
'csm_wcs_ctwocc': cncgsm[cg]['csm_wcs_ctwocc'],
'csm_wcs_ctwcc': cncgsm[cg]['csm_wcs_ctwcc'],
'csm_wcs_csc': cncgsm[cg]['csm_wcs_csc'],
'rotation_matrix_wocs_ctwocc': cncgsm[cg]['rotation_matrix_wocs_ctwocc'],
'rotation_matrix_wocs_ctwcc': cncgsm[cg]['rotation_matrix_wocs_ctwcc'],
'rotation_matrix_wocs_csc': cncgsm[cg]['rotation_matrix_wocs_csc'],
'rotation_matrix_wcs_ctwocc': cncgsm[cg]['rotation_matrix_wcs_ctwocc'],
'rotation_matrix_wcs_ctwcc': cncgsm[cg]['rotation_matrix_wcs_ctwcc'],
'rotation_matrix_wcs_csc': cncgsm[cg]['rotation_matrix_wcs_csc'],
'scaling_factor_wocs_ctwocc': cncgsm[cg]['scaling_factor_wocs_ctwocc'],
'scaling_factor_wocs_ctwcc': cncgsm[cg]['scaling_factor_wocs_ctwcc'],
'scaling_factor_wocs_csc': cncgsm[cg]['scaling_factor_wocs_csc'],
'scaling_factor_wcs_ctwocc': cncgsm[cg]['scaling_factor_wcs_ctwocc'],
'scaling_factor_wcs_ctwcc': cncgsm[cg]['scaling_factor_wcs_ctwcc'],
'scaling_factor_wcs_csc': cncgsm[cg]['scaling_factor_wcs_csc'],
'translation_vector_wocs_ctwocc': cncgsm[cg]['translation_vector_wocs_ctwocc'],
'translation_vector_wocs_ctwcc': cncgsm[cg]['translation_vector_wocs_ctwcc'],
'translation_vector_wocs_csc': cncgsm[cg]['translation_vector_wocs_csc'],
'translation_vector_wcs_ctwocc': cncgsm[cg]['translation_vector_wcs_ctwocc'],
'translation_vector_wcs_ctwcc': cncgsm[cg]['translation_vector_wcs_ctwcc'],
'translation_vector_wcs_csc': cncgsm[cg]['translation_vector_wcs_csc']
}
ce.add_coord_geom(cg, cncgsm[cg]['csm'],
algo=cncgsm[cg]['algo'],
permutation=cncgsm[cg]['indices'],
local2perfect_map=cncgsm[cg][
'local2perfect_map'],
perfect2local_map=cncgsm[cg][
'perfect2local_map'],
detailed_voronoi_index={'cn': cn,
'index': inb_set},
other_symmetry_measures=other_csms,
rotation_matrix=cncgsm[cg]['rotation_matrix'],
scaling_factor=cncgsm[cg]['scaling_factor']
)
se.update_coordination_environments(isite=isite, cn=cn, nb_set=nb_set, ce=ce)
return ce
[docs] def setup_local_geometry(self, isite, coords):
"""
Sets up the AbstractGeometry for the local geometry of site with index isite.
:param isite: Index of the site for which the local geometry has to be set up
:param coords: The coordinates of the (local) neighbors
"""
self.local_geometry = AbstractGeometry(
central_site=self.structure.cart_coords[isite],
bare_coords=coords,
centering_type=self.centering_type,
include_central_site_in_centroid=
self.include_central_site_in_centroid)
[docs] def setup_test_perfect_environment(self, symbol, randomness=False,
max_random_dist=0.1,
symbol_type='mp_symbol',
indices='RANDOM',
random_translation='NONE',
random_rotation='NONE',
random_scale='NONE'):
if symbol_type == 'IUPAC':
cg = self.allcg.get_geometry_from_IUPAC_symbol(symbol)
elif symbol_type == 'MP' or symbol_type == 'mp_symbol':
cg = self.allcg.get_geometry_from_mp_symbol(symbol)
else:
raise ValueError('Wrong mp_symbol to setup coordination geometry')
neighb_coords = []
if randomness:
rv = np.random.random_sample(3)
while norm(rv) > 1.0:
rv = np.random.random_sample(3)
coords = [np.zeros(3, np.float) + max_random_dist * rv]
for pp in cg.points:
rv = np.random.random_sample(3)
while norm(rv) > 1.0:
rv = np.random.random_sample(3)
neighb_coords.append(np.array(pp) + max_random_dist * rv)
else:
coords = [np.zeros(3, np.float)]
for pp in cg.points:
neighb_coords.append(np.array(pp))
if indices == 'RANDOM':
shuffle(neighb_coords)
elif indices == 'ORDERED':
pass
else:
neighb_coords = [neighb_coords[ii] for ii in indices]
# Scaling the test environment
if random_scale == 'RANDOM':
scale = 0.1*np.random.random_sample() + 0.95
elif random_scale == 'NONE':
scale = 1.0
else:
scale = random_scale
coords = [scale * cc for cc in coords]
neighb_coords = [scale * cc for cc in neighb_coords]
# Rotating the test environment
if random_rotation == 'RANDOM':
uu = np.random.random_sample(3) + 0.1
uu = uu / norm(uu)
theta = np.pi * np.random.random_sample()
cc = np.cos(theta)
ss = np.sin(theta)
ux = uu[0]
uy = uu[1]
uz = uu[2]
RR = np.matrix([[ux*ux+(1.0-ux*ux)*cc, ux*uy*(1.0-cc)-uz*ss, ux*uz*(1.0-cc)+uy*ss],
[ux*uy*(1.0-cc)+uz*ss, uy*uy+(1.0-uy*uy)*cc, uy*uz*(1.0-cc)-ux*ss],
[ux*uz*(1.0-cc)-uy*ss, uy*uz*(1.0-cc)+ux*ss, uz*uz+(1.0-uz*uz)*cc]])
elif random_rotation == 'NONE':
RR = [[1.0, 0.0, 0.0],
[0.0, 1.0, 0.0],
[0.0, 0.0, 1.0]]
else:
RR = random_rotation
newcoords = []
for cc in coords:
newcc = RR * np.matrix(cc).T
newcoords.append(newcc.getA1())
coords = newcoords
newcoords = []
for cc in neighb_coords:
newcc = RR * np.matrix(cc).T
newcoords.append(newcc.getA1())
neighb_coords = newcoords
# Translating the test environment
if random_translation == 'RANDOM':
translation = 10.0 * (2.0*np.random.random_sample(3)-1.0)
elif random_translation == 'NONE':
translation = np.zeros(3, np.float)
else:
translation = random_translation
coords = [cc + translation for cc in coords]
neighb_coords = [cc + translation for cc in neighb_coords]
coords.extend(neighb_coords)
myspecies = ["O"] * (len(coords))
myspecies[0] = "Cu"
amin = np.min([cc[0] for cc in coords])
amax = np.max([cc[0] for cc in coords])
bmin = np.min([cc[1] for cc in coords])
bmax = np.max([cc[1] for cc in coords])
cmin = np.min([cc[2] for cc in coords])
cmax = np.max([cc[2] for cc in coords])
factor = 5.0
aa = factor * max([amax - amin, bmax - bmin, cmax - cmin])
lattice = Lattice.cubic(a=aa)
structure = Structure(lattice=lattice, species=myspecies, coords=coords,
to_unit_cell=False, coords_are_cartesian=True)
self.setup_structure(structure=structure)
self.setup_local_geometry(isite=0, coords=neighb_coords)
self.perfect_geometry = AbstractGeometry.from_cg(cg=cg)
[docs] def setup_random_structure(self, coordination):
"""
Sets up a purely random structure with a given coordination.
:param coordination: coordination number for the random structure
"""
aa = 0.4
bb = -0.2
coords = list()
for ii in range(coordination + 1):
coords.append(aa * np.random.random_sample(3, ) + bb)
self.set_structure(
lattice=np.array([[10, 0, 0], [0, 10, 0], [0, 0, 10]], np.float),
species=["Si"] * (coordination + 1),
coords=coords,
coords_are_cartesian=False)
self.setup_random_indices_local_geometry(coordination)
[docs] def setup_random_indices_local_geometry(self, coordination):
"""
Sets up random indices for the local geometry, for testing purposes
:param coordination: coordination of the local geometry
"""
self.icentral_site = 0
self.indices = list(range(1, coordination + 1))
np.random.shuffle(self.indices)
[docs] def setup_ordered_indices_local_geometry(self, coordination):
"""
Sets up ordered indices for the local geometry, for testing purposes
:param coordination: coordination of the local geometry
"""
self.icentral_site = 0
self.indices = list(range(1, coordination + 1))
[docs] def setup_explicit_indices_local_geometry(self, explicit_indices):
"""
Sets up explicit indices for the local geometry, for testing purposes
:param explicit_indices: explicit indices for the neighbors (set of numbers
from 0 to CN-1 in a given order)
"""
self.icentral_site = 0
self.indices = [ii + 1 for ii in explicit_indices]
[docs] def get_coordination_symmetry_measures(self, only_minimum=True,
all_csms=True):
"""
Returns the continuous symmetry measures of the current local geometry in a dictionary.
:return: the continuous symmetry measures of the current local geometry in a dictionary.
"""
if len(self.local_geometry.coords) == 1:
test_geometries = self.allcg.get_implemented_geometries(
len(self.local_geometry.coords))
if len(test_geometries) == 0:
return {}
result_dict = {'S:1': {'csm': 0.0, 'indices': [0], 'algo': 'EXPLICIT',
'local2perfect_map': {0: 0}, 'perfect2local_map': {0: 0},
'scaling_factor': None, 'rotation_matrix': None, 'translation_vector': None}}
if all_csms:
for csmtype in ['wocs_ctwocc', 'wocs_ctwcc', 'wocs_csc', 'wcs_ctwocc', 'wcs_ctwcc', 'wcs_csc']:
result_dict['S:1']['csm_{}'.format(csmtype)] = 0.0
result_dict['S:1']['scaling_factor_{}'.format(csmtype)] = None
result_dict['S:1']['rotation_matrix_{}'.format(csmtype)] = None
result_dict['S:1']['translation_vector_{}'.format(csmtype)] = None
return result_dict
test_geometries = self.allcg.get_implemented_geometries(
len(self.local_geometry.coords))
result_dict = {}
for geometry in test_geometries:
self.perfect_geometry = AbstractGeometry.from_cg(cg=geometry,
centering_type=self.centering_type,
include_central_site_in_centroid=
self.include_central_site_in_centroid)
#points_perfect = self.perfect_geometry.points_wocs_ctwocc()
points_perfect = self.perfect_geometry.points_wcs_ctwcc()
cgsm = self.coordination_geometry_symmetry_measures(geometry,
points_perfect=points_perfect)
result, permutations, algos, local2perfect_maps, perfect2local_maps = cgsm
if only_minimum:
if len(result) > 0:
imin = np.argmin([rr['symmetry_measure'] for rr in result])
if geometry.algorithms is not None:
algo = algos[imin]
else:
algo = algos
result_dict[geometry.mp_symbol] = {'csm': result[imin]['symmetry_measure'],
'indices': permutations[
imin],
'algo': algo,
'local2perfect_map':
local2perfect_maps[
imin],
'perfect2local_map':
perfect2local_maps[
imin],
'scaling_factor': 1.0 / result[imin]['scaling_factor'],
'rotation_matrix':
np.linalg.inv(result[imin]['rotation_matrix']),
'translation_vector': result[imin]['translation_vector']}
if all_csms:
permutation = permutations[imin]
# Without central site, centered on the centroid (centroid does not include the central site)
# result_dict[geometry.mp_symbol]['csm_wocs_ctwocc'] = \
# result[imin]
pdist = self.local_geometry.points_wocs_ctwocc(
permutation=permutation)
pperf = self.perfect_geometry.points_wocs_ctwocc()
sm_info = symmetry_measure(points_distorted=pdist,
points_perfect=pperf)
result_dict[geometry.mp_symbol]['csm_wocs_ctwocc'] = sm_info['symmetry_measure']
result_dict[geometry.mp_symbol]['rotation_matrix_wocs_ctwocc'] = \
np.linalg.inv(sm_info['rotation_matrix'])
result_dict[geometry.mp_symbol]['scaling_factor_wocs_ctwocc'] = 1.0 / sm_info['scaling_factor']
result_dict[geometry.mp_symbol]['translation_vector_wocs_ctwocc'] = \
self.local_geometry.centroid_without_centre
# Without central site, centered on the centroid (centroid includes the central site)
pdist = self.local_geometry.points_wocs_ctwcc(
permutation=permutation)
pperf = self.perfect_geometry.points_wocs_ctwcc()
sm_info = symmetry_measure(points_distorted=pdist,
points_perfect=pperf)
result_dict[geometry.mp_symbol]['csm_wocs_ctwcc'] = sm_info['symmetry_measure']
result_dict[geometry.mp_symbol]['rotation_matrix_wocs_ctwcc'] = \
np.linalg.inv(sm_info['rotation_matrix'])
result_dict[geometry.mp_symbol]['scaling_factor_wocs_ctwcc'] = 1.0 / sm_info['scaling_factor']
result_dict[geometry.mp_symbol]['translation_vector_wocs_ctwcc'] = \
self.local_geometry.centroid_with_centre
# Without central site, centered on the central site
pdist = self.local_geometry.points_wocs_csc(
permutation=permutation)
pperf = self.perfect_geometry.points_wocs_csc()
sm_info = symmetry_measure(points_distorted=pdist,
points_perfect=pperf)
result_dict[geometry.mp_symbol]['csm_wocs_csc'] = sm_info['symmetry_measure']
result_dict[geometry.mp_symbol]['rotation_matrix_wocs_csc'] = \
np.linalg.inv(sm_info['rotation_matrix'])
result_dict[geometry.mp_symbol]['scaling_factor_wocs_csc'] = 1.0 / sm_info['scaling_factor']
result_dict[geometry.mp_symbol]['translation_vector_wocs_csc'] = \
self.local_geometry.bare_centre
# With central site, centered on the centroid (centroid does not include the central site)
pdist = self.local_geometry.points_wcs_ctwocc(
permutation=permutation)
pperf = self.perfect_geometry.points_wcs_ctwocc()
sm_info = symmetry_measure(points_distorted=pdist,
points_perfect=pperf)
result_dict[geometry.mp_symbol]['csm_wcs_ctwocc'] = sm_info['symmetry_measure']
result_dict[geometry.mp_symbol]['rotation_matrix_wcs_ctwocc'] = \
np.linalg.inv(sm_info['rotation_matrix'])
result_dict[geometry.mp_symbol]['scaling_factor_wcs_ctwocc'] = 1.0 / sm_info['scaling_factor']
result_dict[geometry.mp_symbol]['translation_vector_wcs_ctwocc'] = \
self.local_geometry.centroid_without_centre
# With central site, centered on the centroid (centroid includes the central site)
pdist = self.local_geometry.points_wcs_ctwcc(
permutation=permutation)
pperf = self.perfect_geometry.points_wcs_ctwcc()
sm_info = symmetry_measure(points_distorted=pdist,
points_perfect=pperf)
result_dict[geometry.mp_symbol]['csm_wcs_ctwcc'] = sm_info['symmetry_measure']
result_dict[geometry.mp_symbol]['rotation_matrix_wcs_ctwcc'] = \
np.linalg.inv(sm_info['rotation_matrix'])
result_dict[geometry.mp_symbol]['scaling_factor_wcs_ctwcc'] = 1.0 / sm_info['scaling_factor']
result_dict[geometry.mp_symbol]['translation_vector_wcs_ctwcc'] = \
self.local_geometry.centroid_with_centre
# With central site, centered on the central site
pdist = self.local_geometry.points_wcs_csc(
permutation=permutation)
pperf = self.perfect_geometry.points_wcs_csc()
sm_info = symmetry_measure(points_distorted=pdist,
points_perfect=pperf)
result_dict[geometry.mp_symbol]['csm_wcs_csc'] = sm_info['symmetry_measure']
result_dict[geometry.mp_symbol]['rotation_matrix_wcs_csc'] = \
np.linalg.inv(sm_info['rotation_matrix'])
result_dict[geometry.mp_symbol]['scaling_factor_wcs_csc'] = 1.0 / sm_info['scaling_factor']
result_dict[geometry.mp_symbol]['translation_vector_wcs_csc'] = \
self.local_geometry.bare_centre
else:
result_dict[geometry.mp_symbol] = {'csm': result,
'indices': permutations,
'algo': algos,
'local2perfect_map': local2perfect_maps,
'perfect2local_map': perfect2local_maps}
return result_dict
[docs] def coordination_geometry_symmetry_measures(self, coordination_geometry,
tested_permutations=False,
points_perfect=None):
"""
Returns the symmetry measures of a given coordination_geometry for a set of permutations depending on
the permutation setup. Depending on the parameters of the LocalGeometryFinder and on the coordination
geometry, different methods are called.
:param coordination_geometry: Coordination geometry for which the symmetry measures are looked for
:return: the symmetry measures of a given coordination_geometry for a set of permutations
:raise: NotImplementedError if the permutation_setup does not exists
"""
if tested_permutations:
tested_permutations = set()
if self.permutations_safe_override:
return self.coordination_geometry_symmetry_measures_safe_override(
coordination_geometry)
csms = []
permutations = []
algos = []
local2perfect_maps = []
perfect2local_maps = []
for algo in coordination_geometry.algorithms:
if algo.algorithm_type == EXPLICIT_PERMUTATIONS:
return self.coordination_geometry_symmetry_measures_standard(
coordination_geometry, algo,
points_perfect=points_perfect)
if algo.algorithm_type == SEPARATION_PLANE:
cgsm = self.coordination_geometry_symmetry_measures_separation_plane(
coordination_geometry,
algo,
tested_permutations=tested_permutations,
points_perfect=points_perfect)
csm, perm, algo, local2perfect_map, perfect2local_map = cgsm
csms.extend(csm)
permutations.extend(perm)
algos.extend(algo)
local2perfect_maps.extend(local2perfect_map)
perfect2local_maps.extend(perfect2local_map)
return csms, permutations, algos, local2perfect_maps, perfect2local_maps
[docs] def coordination_geometry_symmetry_measures_safe_override(self,
coordination_geometry):
"""
Returns the symmetry measures for a set of permutations (whose setup depends on the coordination geometry)
for the coordination geometry "coordination_geometry". Standard implementatison looking for the symmetry
measures of each permutation
:param coordination_geometry: The coordination geometry to be investigated
:return: The symmetry measures for the given coordination geometry for each permutation investigated
"""
permutations_symmetry_measures = np.zeros(
coordination_geometry.number_of_permutations, np.float)
permutations = list()
iperm = 0
for perm in itertools.permutations(
list(range(coordination_geometry.coordination_number))):
permutations.append(np.argsort(perm))
bare_coords = list()
for ii in perm:
bare_coords.append(coordination_geometry.points[ii])
perfect_geometry = AbstractGeometry(
central_site=coordination_geometry.get_central_site(),
bare_coords=bare_coords,
centering_type=self.centering_type,
include_central_site_in_centroid=
self.include_central_site_in_centroid)
permutations_symmetry_measures[
iperm] = self.symmetry_measure_newpmg(self.local_geometry,
perfect_geometry)
iperm += 1
return permutations_symmetry_measures, permutations, 'SAFE'
[docs] def coordination_geometry_symmetry_measures_standard(self,
coordination_geometry,
algo,
points_perfect=None):
"""
Returns the symmetry measures for a set of permutations (whose setup depends on the coordination geometry)
for the coordination geometry "coordination_geometry". Standard implementation looking for the symmetry
measures of each permutation
:param coordination_geometry: The coordination geometry to be investigated
:return: The symmetry measures for the given coordination geometry for each permutation investigated
"""
# permutations_symmetry_measures = np.zeros(len(algo.permutations),
# np.float)
permutations_symmetry_measures = [None] * len(algo.permutations)
permutations = list()
algos = list()
local2perfect_maps = list()
perfect2local_maps = list()
for iperm, perm in enumerate(algo.permutations):
local2perfect_map = {}
perfect2local_map = {}
permutations.append(perm)
for iperfect, ii in enumerate(perm):
perfect2local_map[iperfect] = ii
local2perfect_map[ii] = iperfect
local2perfect_maps.append(local2perfect_map)
perfect2local_maps.append(perfect2local_map)
# points_distorted = self.local_geometry.points_wocs_ctwocc(
# permutation=perm)
points_distorted = self.local_geometry.points_wcs_ctwcc(
permutation=perm)
sm_info = symmetry_measure(points_distorted=points_distorted,
points_perfect=points_perfect)
sm_info['translation_vector'] = self.local_geometry.centroid_with_centre
# csm = sm_info['symmetry_measure']
# permutations_symmetry_measures[iperm] = csm
permutations_symmetry_measures[iperm] = sm_info
algos.append(str(algo))
return permutations_symmetry_measures, permutations, algos, local2perfect_maps, perfect2local_maps
[docs] def coordination_geometry_symmetry_measures_separation_plane(self,
coordination_geometry,
separation_plane_algo,
testing=False,
tested_permutations=False,
points_perfect=None):
"""
Returns the symmetry measures of the given coordination geometry "coordination_geometry" using separation
facets to reduce the complexity of the system. Caller to the refined 2POINTS, 3POINTS and other ...
:param coordination_geometry: The coordination geometry to be investigated
:return: The symmetry measures for the given coordination geometry for each plane and permutation investigated
"""
permutations = list()
permutations_symmetry_measures = list()
plane_separations = list()
algos = list()
perfect2local_maps = list()
local2perfect_maps = list()
if testing:
separation_permutations = list()
nplanes = 0
for npoints in range(separation_plane_algo.minimum_number_of_points,
min(separation_plane_algo.maximum_number_of_points,
4) + 1):
for points_combination in itertools.combinations(
self.local_geometry.coords, npoints):
if npoints == 2:
if collinear(points_combination[0], points_combination[1],
self.local_geometry.central_site,
tolerance=0.25):
continue
plane = Plane.from_3points(points_combination[0],
points_combination[1],
self.local_geometry.central_site)
elif npoints == 3:
if collinear(points_combination[0], points_combination[1],
points_combination[2], tolerance=0.25):
continue
plane = Plane.from_3points(points_combination[0],
points_combination[1],
points_combination[2])
elif npoints > 3:
plane = Plane.from_npoints(points_combination,
best_fit='least_square_distance')
else:
raise ValueError(
'Wrong number of points to initialize separation plane')
cgsm = self._cg_csm_separation_plane(
coordination_geometry=coordination_geometry,
sepplane=separation_plane_algo,
local_plane=plane,
plane_separations=plane_separations,
dist_tolerances=DIST_TOLERANCES,
testing=testing,
tested_permutations=tested_permutations,
points_perfect=points_perfect)
csm, perm, algo = cgsm[0], cgsm[1], cgsm[2]
if csm is not None:
permutations_symmetry_measures.extend(csm)
permutations.extend(perm)
for thisperm in perm:
p2l = {}
l2p = {}
for i_p, pp in enumerate(thisperm):
p2l[i_p] = pp
l2p[pp] = i_p
perfect2local_maps.append(p2l)
local2perfect_maps.append(l2p)
algos.extend(algo)
if testing:
separation_permutations.extend(cgsm[3])
nplanes += 1
if nplanes > 0:
break
if nplanes == 0:
return self.coordination_geometry_symmetry_measures_fallback_random(
coordination_geometry,
points_perfect=points_perfect)
# if testing:
# return np.array(permutations_symmetry_measures,
# np.float), permutations, separation_permutations
# return np.array(permutations_symmetry_measures,
# np.float), permutations, algos, local2perfect_maps, perfect2local_maps
if testing:
return permutations_symmetry_measures, permutations, separation_permutations
return permutations_symmetry_measures, permutations, algos, local2perfect_maps, perfect2local_maps
def _cg_csm_separation_plane(self, coordination_geometry, sepplane,
local_plane,
plane_separations,
dist_tolerances=DIST_TOLERANCES,
testing=False, tested_permutations=False,
points_perfect=None):
argref_separation = sepplane.argsorted_ref_separation_perm
plane_found = False
for dist_tolerance in dist_tolerances:
permutations = []
permutations_symmetry_measures = []
if testing:
separation_permutations = []
algo = 'NOT_FOUND'
separation = local_plane.indices_separate(
self.local_geometry._coords, dist_tolerance)
# Do not consider facets leading to the same separation indices
separation = sort_separation(separation)
if separation_in_list(separation, plane_separations):
continue
# Do not consider a separation which does not follow the reference separation of the perfect
# coordination geometry
if len(separation[1]) != len(sepplane.plane_points):
continue
if len(separation[0]) == len(sepplane.point_groups[0]):
this_separation = separation
plane_separations.append(this_separation)
elif len(separation[0]) == len(sepplane.point_groups[1]):
this_separation = [list(separation[2]), list(separation[1]),
list(separation[0])]
plane_separations.append(this_separation)
else:
continue
if sepplane.ordered_plane:
inp = [pp for ip, pp in enumerate(self.local_geometry._coords)
if ip in this_separation[1]]
if sepplane.ordered_point_groups[0]:
pp_s0 = [pp for ip, pp in
enumerate(self.local_geometry._coords) if
ip in this_separation[0]]
ordind_s0 = local_plane.project_and_to2dim_ordered_indices(
pp_s0)
sep0 = [this_separation[0][ii] for ii in ordind_s0]
else:
sep0 = list(this_separation[0])
if sepplane.ordered_point_groups[1]:
pp_s2 = [pp for ip, pp in
enumerate(self.local_geometry._coords) if
ip in this_separation[2]]
ordind_s2 = local_plane.project_and_to2dim_ordered_indices(
pp_s2)
sep2 = [this_separation[2][ii] for ii in ordind_s2]
else:
sep2 = list(this_separation[2])
separation_perm = list(sep0)
ordind = local_plane.project_and_to2dim_ordered_indices(inp)
separation_perm.extend(
[this_separation[1][ii] for ii in ordind])
algo = 'SEPARATION_PLANE_2POINTS_ORDERED'
separation_perm.extend(sep2)
else:
separation_perm = list(this_separation[0])
separation_perm.extend(this_separation[1])
algo = 'SEPARATION_PLANE_2POINTS'
separation_perm.extend(this_separation[2])
if self.plane_safe_permutations:
sep_perms = sepplane.safe_separation_permutations(
ordered_plane=sepplane.ordered_plane,
ordered_point_groups=sepplane.ordered_point_groups)
else:
sep_perms = sepplane.permutations
plane_found = True
for i_sep_perm, sep_perm in enumerate(sep_perms):
perm1 = [separation_perm[ii] for ii in sep_perm]
pp = [perm1[ii] for ii in argref_separation]
# Skip permutations that have already been performed
if tested_permutations != False and coordination_geometry.equivalent_indices is not None:
tuple_ref_perm = coordination_geometry.ref_permutation(pp)
if tuple_ref_perm in tested_permutations:
continue
tested_permutations.add(tuple_ref_perm)
permutations.append(pp)
if testing:
separation_permutations.append(sep_perm)
# points_distorted = self.local_geometry.points_wocs_ctwocc(
# permutation=pp)
points_distorted = self.local_geometry.points_wcs_ctwcc(
permutation=pp)
sm_info = symmetry_measure(points_distorted=points_distorted,
points_perfect=points_perfect)
sm_info['translation_vector'] = self.local_geometry.centroid_with_centre
# csm = sm_info['symmetry_measure']
# permutations_symmetry_measures.append(csm)
permutations_symmetry_measures.append(sm_info)
if plane_found:
break
if len(permutations_symmetry_measures) > 0:
if testing:
return permutations_symmetry_measures, permutations, algo, separation_permutations
else:
return permutations_symmetry_measures, permutations, [
sepplane.algorithm_type] * len(permutations)
else:
if plane_found:
return permutations_symmetry_measures, permutations, []
else:
return None, None, None
[docs] def coordination_geometry_symmetry_measures_fallback_random(self,
coordination_geometry,
NRANDOM=10,
points_perfect=None):
"""
Returns the symmetry measures for a random set of permutations for the coordination geometry
"coordination_geometry". Fallback implementation for the plane separation algorithms measures
of each permutation
:param coordination_geometry: The coordination geometry to be investigated
:param NRANDOM: Number of random permutations to be tested
:return: The symmetry measures for the given coordination geometry for each permutation investigated
"""
# permutations_symmetry_measures = np.zeros(NRANDOM, np.float)
permutations_symmetry_measures = [None] * NRANDOM
permutations = list()
algos = list()
perfect2local_maps = list()
local2perfect_maps = list()
for iperm in range(NRANDOM):
perm = np.random.permutation(
coordination_geometry.coordination_number)
permutations.append(perm)
p2l = {}
l2p = {}
for i_p, pp in enumerate(perm):
p2l[i_p] = pp
l2p[pp] = i_p
perfect2local_maps.append(p2l)
local2perfect_maps.append(l2p)
# points_distorted = self.local_geometry.points_wocs_ctwocc(
# permutation=perm)
points_distorted = self.local_geometry.points_wcs_ctwcc(
permutation=perm)
sm_info = symmetry_measure(points_distorted=points_distorted,
points_perfect=points_perfect)
sm_info['translation_vector'] = self.local_geometry.centroid_with_centre
# csm = sm_info['symmetry_measure']
# permutations_symmetry_measures[iperm] = csm
permutations_symmetry_measures[iperm] = sm_info
algos.append('APPROXIMATE_FALLBACK')
return permutations_symmetry_measures, permutations, algos, local2perfect_maps, perfect2local_maps