def test_pdf_primitive_vs_supercell(self):
test_doc, success = res2dict(REAL_PATH + "data/KP_primitive.res",
db=False)
test_doc["text_id"] = ["primitive", "cell"]
test_doc["lattice_cart"] = abc2cart(test_doc["lattice_abc"])
test_doc["cell_volume"] = cart2volume(test_doc["lattice_cart"])
supercell_doc, success = res2dict(REAL_PATH + "data/KP_supercell.res",
db=False)
supercell_doc["text_id"] = ["supercell", "cell"]
supercell_doc["lattice_cart"] = abc2cart(supercell_doc["lattice_abc"])
supercell_doc["cell_volume"] = cart2volume(
supercell_doc["lattice_cart"])
test_doc["pdf"] = PDF(test_doc,
dr=0.01,
low_mem=True,
rmax=10,
num_images="auto",
debug=DEBUG)
supercell_doc["pdf"] = PDF(
supercell_doc,
dr=0.01,
low_mem=True,
rmax=10,
num_images="auto",
debug=DEBUG,
)
overlap = PDFOverlap(test_doc["pdf"], supercell_doc["pdf"])
self.assertLessEqual(overlap.similarity_distance, 1e-3)
self.assertGreaterEqual(overlap.similarity_distance, 0.0)
def test_cart2abc(self):
castep_fname = REAL_PATH + "data/Na3Zn4-swap-ReOs-OQMD_759599.castep"
self.assertTrue(os.path.isfile(castep_fname))
test_doc, s = castep2dict(castep_fname, db=True, verbosity=VERBOSITY)
try:
self.assertTrue(
np.allclose(test_doc["lattice_abc"],
cart2abc(test_doc["lattice_cart"])),
msg="Conversion cart2abc failed.",
)
self.assertTrue(
np.allclose(
cart2abc(test_doc["lattice_cart"]),
cart2abc(abc2cart(test_doc["lattice_abc"])),
),
msg="Conversion abc2cart failed.",
)
self.assertAlmostEqual(
test_doc["cell_volume"],
cart2volume(test_doc["lattice_cart"]),
msg="Failed to calculate volume from lattice vectors.",
places=5,
)
self.assertIsInstance(test_doc["lattice_abc"],
list,
msg="Failed abc numpy cast to list")
self.assertIsInstance(
test_doc["lattice_cart"],
list,
msg="Failed cartesian numpy cast to list",
)
cart_pos = frac2cart(test_doc["lattice_cart"],
test_doc["positions_frac"])
back2frac = cart2frac(test_doc["lattice_cart"], cart_pos)
np.testing.assert_array_almost_equal(back2frac,
test_doc["positions_frac"])
except AssertionError:
print("cart:", test_doc["lattice_cart"],
abc2cart(test_doc["lattice_abc"]))
print("abc:", test_doc["lattice_abc"],
cart2abc(test_doc["lattice_cart"]))
print(
"volume:",
test_doc["cell_volume"],
cart2volume(test_doc["lattice_cart"]),
)
raise AssertionError
def doc2pwscf(doc, path, template=None, spacing=None):
""" Write the structural part of QE input file based
on the provided matador doc. Will calculate the correct
kpoint_mp_grid if spacing is provided.
Parameters:
doc (dict): matador document containing structure
path (str): desired filename for res file
Keyword Arguments:
template (str): filename of template to prepend before structure
(with prefix keyword to be replaced),
spacing (float): kpoint_mp_spacing to use when calculating grid.
"""
if path.endswith('.in'):
path = path.replace('.in', '')
if os.path.isfile(path + '.in'):
print('File already exists, not overwriting...')
return
if 'lattice_cart' not in doc:
doc['lattice_cart'] = abc2cart(doc['lattice_abc'])
if 'kpoints_mp_spacing' in doc or spacing is not None:
if 'kpoints_mp_spacing' in doc:
spacing = doc['kpoints_mp_spacing']
doc['kpoints_mp_grid'] = calc_mp_grid(doc['lattice_cart'], spacing)
print(doc['kpoints_mp_grid'])
file_string = ''
file_string += 'CELL_PARAMETERS angstrom\n'
for i in range(3):
file_string += ' {d[0]: 10.10f} {d[1]: 10.10f} {d[2]: 10.10f}\n'.format(d=doc['lattice_cart'][i])
file_string += '\n ATOMIC_POSITIONS crystal\n'
for i in range(len(doc['atom_types'])):
file_string += ('{:4} {d[0]: 10.10f} {d[1]: 10.10f} {d[2]: 10.10f}\n'
.format(doc['atom_types'][i], d=doc['positions_frac'][i]))
file_string += '\nK_POINTS automatic\n'
file_string += '{d[0]} {d[1]} {d[2]} 0 0 0'.format(d=doc['kpoints_mp_grid'])
if template is not None:
if os.path.isfile(template):
with open(template, 'r') as f:
template_string = f.readlines()
with open(path + '.in', 'w') as f:
for line in template_string:
if 'prefix' in line:
line = ' prefix = \'{}\',\n'.format(path)
elif 'nat' in line:
line = ' nat = {},\n'.format(len(doc['atom_types']))
elif 'nat' in line:
line = ' ntyp = {},\n'.format(len(set(doc['atom_types'])))
f.write(line)
f.write(file_string)
def test_pdf_from_projected(self):
doc, success = res2dict(REAL_PATH + "data/LiPZn-r57des.res")
doc["lattice_cart"] = abc2cart(doc["lattice_abc"])
doc["text_id"] = ["unprojected", "test"]
doc["pdf_unprojected"] = PDF(doc, dr=0.01, **{"debug": False})
doc["text_id"] = ["projected", "test"]
doc["pdf_projected"] = PDF(doc, dr=0.01, **{"debug": False})
np.testing.assert_array_almost_equal(doc["pdf_unprojected"].gr,
doc["pdf_projected"].gr)
def test_shift_grid(self):
from matador.utils.cell_utils import (
calc_mp_grid,
shift_to_include_gamma,
abc2cart,
)
lattice_abc = [[5.57068, 10.222092, 10.222039], [90.0, 90.0, 90.0]]
lattice_cart = abc2cart(lattice_abc)
spacing = 0.1
mp_grid = calc_mp_grid(lattice_cart, spacing)
self.assertEqual(mp_grid, [2, 1, 1])
self.assertEqual(shift_to_include_gamma(mp_grid), [0.25, 0, 0])
lattice_abc = [[5.57068, 10.222092, 10.222039], [90.0, 90.0, 90.0]]
lattice_cart = abc2cart(lattice_abc)
spacing = 0.05
mp_grid = calc_mp_grid(lattice_cart, spacing)
self.assertEqual(mp_grid, [4, 2, 2])
self.assertEqual(shift_to_include_gamma(mp_grid), [0.125, 0.25, 0.25])
def test_identity_overlap(self):
doc, success = res2dict(REAL_PATH + "data/LiPZn-r57des.res")
doc["lattice_cart"] = abc2cart(doc["lattice_abc"])
doc["text_id"] = ["pdf", "test"]
doc["pdf_smear"] = PDF(
doc,
num_images=3,
dr=0.001,
gaussian_width=0.1,
style="smear",
debug=False,
low_mem=True,
)
overlap = PDFOverlap(doc["pdf_smear"], doc["pdf_smear"])
self.assertEqual(overlap.similarity_distance, 0.0)
def test_overlap_smear_vs_hist(self):
doc, success = res2dict(REAL_PATH + "data/LiPZn-r57des.res")
doc["lattice_cart"] = abc2cart(doc["lattice_abc"])
doc["text_id"] = ["smear", "test"]
doc["pdf_smear"] = PDF(
doc,
num_images=3,
dr=0.01,
gaussian_width=0.1,
projected=False,
style="smear",
low_mem=True,
)
doc["text_id"] = ["hist", "test"]
doc["pdf_hist"] = PDF(doc,
num_images=3,
dr=0.1,
projected=False,
style="histogram")
overlap = PDFOverlap(doc["pdf_smear"], doc["pdf_hist"])
self.assertLessEqual(overlap.similarity_distance, 0.02)
self.assertGreater(overlap.similarity_distance, 0.0)
def test_auto_images_vs_large(self):
doc, success = res2dict(REAL_PATH + "data/LiPZn-r57des.res")
doc["lattice_cart"] = abc2cart(doc["lattice_abc"])
doc["text_id"] = ["pdf", "test"]
doc["pdf_num_images"] = PDF(doc,
low_mem=True,
num_images=5,
rmax=15,
dr=0.1,
**{
"debug": True,
"projected": False
})
doc["pdf_auto_images"] = PDF(doc,
low_mem=True,
num_images="auto",
rmax=15,
dr=0.1,
**{
"debug": True,
"projected": False
})
np.testing.assert_array_almost_equal(doc["pdf_num_images"].gr,
doc["pdf_auto_images"].gr)
def cif2dict(fname, **kwargs):
""" Extract available information from .cif file and store as a
dictionary. Raw cif data is stored under the `'_cif'` key. Symmetric
sites are expanded by the symmetry operations and their occupancies
are tracked.
Parameters:
fname (str/list): filename or list of filenames of .cif file(s)
(with or without extension).
Returns:
(dict/str, bool): if successful, a dictionary containing scraped
data and True, if not, then an error string and False.
"""
flines, fname = get_flines_extension_agnostic(fname, "cif")
doc = dict()
cif_dict = _cif_parse_raw(flines)
doc['_cif'] = cif_dict
doc['source'] = [str(Path(fname).resolve())]
doc['atom_types'] = []
atom_labels = cif_dict.get("_atom_site_type_symbol", False)
if not atom_labels:
atom_labels = cif_dict.get("_atom_site_label", False)
if not atom_labels:
raise RuntimeError(f"Unable to find atom types in cif file {fname}.")
for atom in atom_labels:
symbol = ''
for character in atom:
if not character.isalpha():
break
else:
symbol += character
doc['atom_types'].append(symbol)
doc['positions_frac'] = [list(map(lambda x: float(x.split('(')[0]), vector)) for vector in
zip(cif_dict['_atom_site_fract_x'],
cif_dict['_atom_site_fract_y'],
cif_dict['_atom_site_fract_z'])]
if '_atom_site_occupancy' in cif_dict:
doc['site_occupancy'] = [float(x.split('(')[0]) for x in cif_dict['_atom_site_occupancy']]
else:
doc['site_occupancy'] = [1.0 for _ in doc['positions_frac']]
if '_atom_site_symmetry_multiplicity' in cif_dict:
doc['site_multiplicity'] = [float(x.split('(')[0]) for x in cif_dict['_atom_site_symmetry_multiplicity']]
else:
doc['site_multiplicity'] = [1.0 for _ in doc['positions_frac']]
doc['lattice_abc'] = [list(map(_cif_parse_float_with_errors,
[cif_dict['_cell_length_a'],
cif_dict['_cell_length_b'],
cif_dict['_cell_length_c']])),
list(map(_cif_parse_float_with_errors,
[cif_dict['_cell_angle_alpha'],
cif_dict['_cell_angle_beta'],
cif_dict['_cell_angle_gamma']]))]
doc['lattice_cart'] = abc2cart(doc['lattice_abc'])
doc['cell_volume'] = cart2volume(doc['lattice_cart'])
doc['stoichiometry'] = _cif_disordered_stoichiometry(doc)
doc['num_atoms'] = len(doc['positions_frac'])
if '_space_group_symop_operation_xyz' in doc['_cif'] and '_symmetry_equiv_pos_as_xyz' not in doc['_cif']:
doc["_cif"]["_symmetry_equiv_pos_as_xyz"] = doc["_cif"]["_space_group_symop_operation_xyz"]
if '_symmetry_equiv_pos_as_xyz' in doc['_cif']:
_cif_set_unreduced_sites(doc)
try:
doc['space_group'] = get_spacegroup_spg(doc, check_occ=False)
except RuntimeError:
pass
return doc, True
def make_recipe(self, structure, sg):
""" Construct PDF with diffpy. """
# construct a PDFContribution object
pdf = PDFContribution("Contribution")
# read experimental data
try:
pdf.loadData(self.input_file)
except:
print_failure('Failed to parse ' + self.input_file +
'. Exiting...')
exit()
print('Constructing PDF object for', structure.title)
pdf.setCalculationRange(self.xmin, self.xmax, self.dx)
pdf.addStructure("Contribution", structure)
# create FitRecipe to calculate PDF with chosen fit variable
fit = FitRecipe()
fit.addContribution(pdf)
# configure variables and add to recipe
if sg != 'xxx' and sg is not None:
print(sg)
spacegroup_params = constrainAsSpaceGroup(pdf.Contribution.phase,
sg)
else:
cart_lat = abc2cart([[
structure.lattice.a, structure.lattice.b, structure.lattice.c
],
[
structure.lattice.alpha,
structure.lattice.beta,
structure.lattice.gamma
]])
positions_frac = structure.xyz
atomic_numbers = []
for atom in structure.element:
atomic_numbers.append(get_atomic_number(atom))
cell = (cart_lat, positions_frac, atomic_numbers)
sg = int(
spg.get_spacegroup(cell, symprec=1e-2).split(' ')[1].replace(
'(', '').replace(')', ''))
spacegroup_params = constrainAsSpaceGroup(pdf.Contribution.phase,
sg)
# print('Space group parameters:')
# print(', '.join([param.name for param in spacegroup_params]))
# iterate through spacegroup params and activate them
for param in spacegroup_params.latpars:
fit.addVar(param)
for param in spacegroup_params.xyzpars:
fit.addVar(param, fixed=True)
# these next parameters are taken from Martin's PDFht.py,
# though I have a feeling that was not their origin...
# set initial ADP parameters
for param in spacegroup_params.adppars:
fit.addVar(param, value=0.03, fixed=True)
# overall scale of PDF and delta2 parameter for correlated motion - from PDFht.py
fit.addVar(pdf.scale, 1, fixed=True)
fit.restrain(pdf.scale, lb=0, ub=0.1, scaled=True)
fit.addVar(pdf.Contribution.delta2, 5, fixed=True)
fit.restrain(pdf.Contribution.delta2, lb=1, ub=10, scaled=True)
# fix Qdamp based on information about "our beamline": yep, no idea
fit.addVar(pdf.qdamp, 0.03, fixed=True)
fit.restrain(pdf.qdamp, lb=0, ub=0.1, scaled=True)
return fit
def random_slice(parent_seeds,
standardize=True,
supercell=True,
shift=True,
debug=False):
""" Simple cut-and-splice crossover of two parents.
The overall size of the child can vary between 0.5 and 1.5 the size of the
parent structures. Both parent structures are cut and spliced along the
same crystallographic axis.
Parameters:
parents (list(dict)) : parent structures to crossover,
standardize (bool) : use spglib to standardize parents pre-crossover,
supercell (bool) : make a random supercell to rescale parents,
shift (bool) : randomly shift atoms in parents to unbias.
Returns:
dict: newborn structure from parents.
"""
parents = deepcopy(parent_seeds)
child = dict()
# child_size is a number between 0.5 and 2
child_size = 0.5 + 1.5 * np.random.rand()
# cut_val is a number between 0.25*child_size and 0.75*child_size
# the slice position of one parent in fractional coordinates
# (the other is (child_size-cut_val))
cut_val = child_size * (0.25 + (np.random.rand() / 2.0))
parent_densities = []
for ind, parent in enumerate(parents):
if "cell_volume" not in parent:
parents[ind]["cell_volume"] = cart2volume(parent["lattice_cart"])
parent_densities.append(parent["num_atoms"] / parent["cell_volume"])
target_density = sum(parent_densities) / len(parent_densities)
if standardize:
parents = [standardize_doc_cell(parent) for parent in parents]
if supercell:
# check ratio of num atoms in parents and grow the smaller one
parent_extent_ratio = parents[0]["cell_volume"] / parents[1][
"cell_volume"]
if debug:
print(
parent_extent_ratio,
parents[0]["cell_volume"],
"vs",
parents[1]["cell_volume"],
)
if parent_extent_ratio < 1:
supercell_factor = int(round(1 / parent_extent_ratio))
supercell_target = 0
elif parent_extent_ratio >= 1:
supercell_factor = int(round(parent_extent_ratio))
supercell_target = 1
if debug:
print(supercell_target, supercell_factor)
supercell_vector = [1, 1, 1]
if supercell_factor > 1:
for ind in range(supercell_factor):
min_lat_vec_abs = 1e10
min_lat_vec_ind = -1
for i in range(3):
lat_vec_abs = np.sum(
np.asarray(
parents[supercell_target]["lattice_cart"][i])**2)
if lat_vec_abs < min_lat_vec_abs:
min_lat_vec_abs = lat_vec_abs
min_lat_vec_ind = i
supercell_vector[min_lat_vec_ind] += 1
if debug:
print("Making supercell of {} with {}".format(
parents[supercell_target]["source"][0], supercell_vector))
if supercell_vector != [1, 1, 1]:
parents[supercell_target] = create_simple_supercell(
parents[supercell_target], supercell_vector, standardize=False)
child["positions_frac"] = []
child["atom_types"] = []
child["lattice_cart"] = cut_val * np.asarray(
parents[0]["lattice_cart"]) + (child_size - cut_val) * np.asarray(
parents[1]["lattice_cart"])
child["lattice_cart"] = child["lattice_cart"].tolist()
# choose slice axis
axis = np.random.randint(low=0, high=3)
for ind, parent in enumerate(parents):
if shift:
# apply same random shift to all atoms in parents
shift_vec = np.random.rand(3)
for idx, _ in enumerate(parent["positions_frac"]):
for k in range(3):
parent["positions_frac"][idx][k] += shift_vec[k]
if parent["positions_frac"][idx][k] >= 1:
parent["positions_frac"][idx][k] -= 1
elif parent["positions_frac"][idx][k] < 0:
parent["positions_frac"][idx][k] += 1
# slice parent
for atom, pos in zip(parent["atom_types"], parent["positions_frac"]):
if ind == (pos[axis] <= cut_val):
child["positions_frac"].append(pos)
child["atom_types"].append(atom)
# check child is sensible
child["mutations"] = ["crossover"]
child["stoichiometry"] = get_stoich(child["atom_types"])
child["num_atoms"] = len(child["atom_types"])
if "cell_volume" not in child:
child["cell_volume"] = cart2volume(child["lattice_cart"])
number_density = child["num_atoms"] / child["cell_volume"]
# rescale cell based on number density of parents
new_scale = np.cbrt(number_density / target_density)
child["lattice_abc"] = np.asarray(cart2abc(child["lattice_cart"]))
child["lattice_abc"][0] *= new_scale
child["lattice_abc"] = child["lattice_abc"].tolist()
child["lattice_cart"] = abc2cart(child["lattice_abc"])
child["cell_volume"] = cart2volume(child["lattice_cart"])
child["positions_abs"] = frac2cart(child["lattice_cart"],
child["positions_frac"])
return child
def lattice_abc(self, new_lattice):
self._lattice_abc = tuple(tuple(vec) for vec in new_lattice)
self._lattice_cart = tuple(
tuple(vec) for vec in cell_utils.abc2cart(self._lattice_abc))
self._volume = None
