def test_get_strain_state_dict(self):
strain_inds = [(0,), (1,), (2,), (1, 3), (1, 2, 3)]
vecs = {}
strain_states = []
for strain_ind in strain_inds:
ss = np.zeros(6)
np.put(ss, strain_ind, 1)
strain_states.append(tuple(ss))
vec = np.zeros((4, 6))
rand_values = np.random.uniform(0.1, 1, 4)
for i in strain_ind:
vec[:, i] = rand_values
vecs[strain_ind] = vec
all_strains = [Strain.from_voigt(v).zeroed() for vec in vecs.values()
for v in vec]
random.shuffle(all_strains)
all_stresses = [Stress.from_voigt(np.random.random(6)).zeroed()
for s in all_strains]
strain_dict = {k.tostring():v for k,v in zip(all_strains, all_stresses)}
ss_dict = get_strain_state_dict(all_strains, all_stresses, add_eq=False)
# Check length of ss_dict
self.assertEqual(len(strain_inds), len(ss_dict))
# Check sets of strain states are correct
self.assertEqual(set(strain_states), set(ss_dict.keys()))
for strain_state, data in ss_dict.items():
# Check correspondence of strains/stresses
for strain, stress in zip(data["strains"], data["stresses"]):
self.assertArrayAlmostEqual(Stress.from_voigt(stress),
strain_dict[Strain.from_voigt(strain).tostring()])
def test_get_strain_state_dict(self):
strain_inds = [(0,), (1,), (2,), (1, 3), (1, 2, 3)]
vecs = {}
strain_states = []
for strain_ind in strain_inds:
ss = np.zeros(6)
np.put(ss, strain_ind, 1)
strain_states.append(tuple(ss))
vec = np.zeros((4, 6))
rand_values = np.random.uniform(0.1, 1, 4)
for i in strain_ind:
vec[:, i] = rand_values
vecs[strain_ind] = vec
all_strains = [Strain.from_voigt(v).zeroed() for vec in vecs.values()
for v in vec]
random.shuffle(all_strains)
all_stresses = [Stress.from_voigt(np.random.random(6)).zeroed()
for s in all_strains]
strain_dict = {k.tostring():v for k,v in zip(all_strains, all_stresses)}
ss_dict = get_strain_state_dict(all_strains, all_stresses, add_eq=False)
# Check length of ss_dict
self.assertEqual(len(strain_inds), len(ss_dict))
# Check sets of strain states are correct
self.assertEqual(set(strain_states), set(ss_dict.keys()))
for strain_state, data in ss_dict.items():
# Check correspondence of strains/stresses
for strain, stress in zip(data["strains"], data["stresses"]):
self.assertArrayAlmostEqual(Stress.from_voigt(stress),
strain_dict[Strain.from_voigt(strain).tostring()])
def get_strains(distance=0.005):
strain_fields = get_strain_fields()
strains = []
for strain_field in strain_fields:
strains.append(Strain.from_voigt(strain_field * abs(distance)))
strains.append(Strain.from_voigt(strain_field * -abs(distance)))
return strains
def test_find_eq_stress(self):
random_strains = [Strain.from_voigt(s) for s in np.random.uniform(0.1, 1, (20, 6))]
random_stresses = [Strain.from_voigt(s) for s in np.random.uniform(0.1, 1, (20, 6))]
with warnings.catch_warnings(record=True):
no_eq = find_eq_stress(random_strains, random_stresses)
self.assertArrayAlmostEqual(no_eq, np.zeros((3,3)))
random_strains[12] = Strain.from_voigt(np.zeros(6))
eq_stress = find_eq_stress(random_strains, random_stresses)
self.assertArrayAlmostEqual(random_stresses[12], eq_stress)
def test_find_eq_stress(self):
random_strains = [Strain.from_voigt(s) for s in np.random.uniform(0.1, 1, (20, 6))]
random_stresses = [Strain.from_voigt(s) for s in np.random.uniform(0.1, 1, (20, 6))]
with warnings.catch_warnings(record=True):
no_eq = find_eq_stress(random_strains, random_stresses)
self.assertArrayAlmostEqual(no_eq, np.zeros((3,3)))
random_strains[12] = Strain.from_voigt(np.zeros(6))
eq_stress = find_eq_stress(random_strains, random_stresses)
self.assertArrayAlmostEqual(random_stresses[12], eq_stress)
def test_get_compliance_expansion(self):
ce_exp = self.exp_cu.get_compliance_expansion()
et_comp = ElasticTensorExpansion(ce_exp)
strain_orig = Strain.from_voigt([0.01, 0, 0, 0, 0, 0])
stress = self.exp_cu.calculate_stress(strain_orig)
strain_revert = et_comp.calculate_stress(stress)
self.assertArrayAlmostEqual(strain_orig, strain_revert, decimal=4)
def test_get_compliance_expansion(self):
ce_exp = self.exp_cu.get_compliance_expansion()
et_comp = ElasticTensorExpansion(ce_exp)
strain_orig = Strain.from_voigt([0.01, 0, 0, 0, 0, 0])
stress = self.exp_cu.calculate_stress(strain_orig)
strain_revert = et_comp.calculate_stress(stress)
self.assertArrayAlmostEqual(strain_orig, strain_revert, decimal=4)
def test_get_strain_from_stress(self):
strain = Strain.from_voigt([0.05, 0, 0, 0, 0, 0])
stress3 = self.exp_cu.calculate_stress(strain)
strain_revert3 = self.exp_cu.get_strain_from_stress(stress3)
self.assertArrayAlmostEqual(strain, strain_revert3, decimal=2)
# fourth order
stress4 = self.exp_cu_4.calculate_stress(strain)
strain_revert4 = self.exp_cu_4.get_strain_from_stress(stress4)
self.assertArrayAlmostEqual(strain, strain_revert4, decimal=2)
def test_find_eq_stress(self):
test_strains = deepcopy(self.strains)
test_stresses = deepcopy(self.pk_stresses)
with warnings.catch_warnings(record=True):
no_eq = find_eq_stress(test_strains, test_stresses)
self.assertArrayAlmostEqual(no_eq, np.zeros((3,3)))
test_strains[3] = Strain.from_voigt(np.zeros(6))
eq_stress = find_eq_stress(test_strains, test_stresses)
self.assertArrayAlmostEqual(test_stresses[3], eq_stress)
def test_find_eq_stress(self):
test_strains = deepcopy(self.strains)
test_stresses = deepcopy(self.pk_stresses)
with warnings.catch_warnings(record=True):
no_eq = find_eq_stress(test_strains, test_stresses)
self.assertArrayAlmostEqual(no_eq, np.zeros((3, 3)))
test_strains[3] = Strain.from_voigt(np.zeros(6))
eq_stress = find_eq_stress(test_strains, test_stresses)
self.assertArrayAlmostEqual(test_stresses[3], eq_stress)
def test_get_strain_from_stress(self):
strain = Strain.from_voigt([0.05, 0, 0, 0, 0, 0])
stress3 = self.exp_cu.calculate_stress(strain)
strain_revert3 = self.exp_cu.get_strain_from_stress(stress3)
self.assertArrayAlmostEqual(strain, strain_revert3, decimal=2)
# fourth order
stress4 = self.exp_cu_4.calculate_stress(strain)
strain_revert4 = self.exp_cu_4.get_strain_from_stress(stress4)
self.assertArrayAlmostEqual(strain, strain_revert4, decimal=2)
def calculate_stress(self, strain):
"""
Calculate's a given elastic tensor's contribution to the
stress using Einstein summation
Args:
strain (3x3 array-like): matrix corresponding to strain
"""
strain = np.array(strain)
if strain.shape == (6,):
strain = Strain.from_voigt(strain)
assert strain.shape == (3, 3), "Strain must be 3x3 or voigt-notation"
stress_matrix = self.einsum_sequence([strain] * (self.order - 1)) / factorial(self.order - 1)
return Stress(stress_matrix)
def calculate_stress(self, strain):
"""
Calculate's a given elastic tensor's contribution to the
stress using Einstein summation
Args:
strain (3x3 array-like): matrix corresponding to strain
"""
strain = np.array(strain)
if strain.shape == (6,):
strain = Strain.from_voigt(strain)
assert strain.shape == (3, 3), "Strain must be 3x3 or voigt-notation"
stress_matrix = self.einsum_sequence([strain]*(self.order - 1)) \
/ factorial(self.order - 1)
return Stress(stress_matrix)
def test_process_elastic_calcs_toec(self):
# Test TOEC tasks
test_struct = PymatgenTest.get_structure('Sn') # use cubic test struct
strain_states = get_default_strain_states(3)
# Default stencil in atomate, this maybe shouldn't be hard-coded
stencil = np.linspace(-0.075, 0.075, 7)
strains = [
Strain.from_voigt(s * np.array(strain_state))
for s, strain_state in product(stencil, strain_states)
]
strains = [s for s in strains if not np.allclose(s, 0)]
sym_reduced = symmetry_reduce(strains, test_struct)
opt_task = {
"output": {
"structure": test_struct.as_dict()
},
"input": {
"structure": test_struct.as_dict()
}
}
defo_tasks = []
for n, strain in enumerate(sym_reduced):
defo = strain.get_deformation_matrix()
new_struct = defo.apply_to_structure(test_struct)
defo_task = {
"output": {
"structure": new_struct.as_dict(),
"stress": (strain * 5).tolist()
},
"input": None,
"task_id": n,
"completed_at": datetime.utcnow()
}
defo_task.update({
"transmuter": {
"transformation_params": [{
"deformation": defo
}]
}
})
defo_tasks.append(defo_task)
explicit, derived = process_elastic_calcs(opt_task, defo_tasks)
self.assertEqual(len(explicit), len(sym_reduced))
self.assertEqual(len(derived), len(strains) - len(sym_reduced))
for calc in derived:
self.assertTrue(
np.allclose(calc['strain'], calc['cauchy_stress'] / -0.5))
def calculate_stress(self, strain):
"""
Calculate's a given elastic tensor's contribution to the
stress using Einstein summation
Args:
strain (3x3 array-like): matrix corresponding to strain
"""
strain = np.array(strain)
if strain.shape == (6, ):
strain = Strain.from_voigt(strain)
assert strain.shape == (3, 3), "Strain must be 3x3 or voigt-notation"
lc = string.ascii_lowercase[:self.rank - 2]
lc_pairs = map(''.join, zip(*[iter(lc)] * 2))
einsum_string = "ij" + lc + ',' + ','.join(lc_pairs) + "->ij"
einsum_args = [self] + [strain] * (self.order - 1)
stress_matrix = np.einsum(einsum_string, *einsum_args) \
/ factorial(self.order - 1)
return Stress(stress_matrix)
def calculate_stress(self, strain):
"""
Calculate's a given elastic tensor's contribution to the
stress using Einstein summation
Args:
strain (3x3 array-like): matrix corresponding to strain
"""
strain = np.array(strain)
if strain.shape == (6,):
strain = Strain.from_voigt(strain)
assert strain.shape == (3, 3), "Strain must be 3x3 or voigt-notation"
lc = string.ascii_lowercase[:self.rank-2]
lc_pairs = map(''.join, zip(*[iter(lc)]*2))
einsum_string = "ij" + lc + ',' + ','.join(lc_pairs) + "->ij"
einsum_args = [self] + [strain] * (self.order - 1)
stress_matrix = np.einsum(einsum_string, *einsum_args) \
/ factorial(self.order - 1)
return Stress(stress_matrix)
def get_wf_elastic_constant(structure,
metadata,
strain_states=None,
stencils=None,
db_file=None,
conventional=False,
order=2,
vasp_input_set=None,
analysis=True,
sym_reduce=False,
tag='elastic',
copy_vasp_outputs=False,
**kwargs):
"""
Returns a workflow to calculate elastic constants.
Firework 1 : write vasp input set for structural relaxation,
run vasp,
pass run location,
database insertion.
Firework 2 - number of total deformations: Static runs on the deformed structures
last Firework : Analyze Stress/Strain data and fit the elastic tensor
Args:
structure (Structure): input structure to be optimized and run.
strain_states (list of Voigt-notation strains): list of ratios of nonzero elements
of Voigt-notation strain, e. g. [(1, 0, 0, 0, 0, 0), (0, 1, 0, 0, 0, 0), etc.].
stencils (list of floats, or list of list of floats): values of strain to multiply
by for each strain state, i. e. stencil for the perturbation along the strain
state direction, e. g. [-0.01, -0.005, 0.005, 0.01]. If a list of lists,
stencils must correspond to each strain state provided.
db_file (str): path to file containing the database credentials.
conventional (bool): flag to convert input structure to conventional structure,
defaults to False.
order (int): order of the tensor expansion to be determined. Defaults to 2 and
currently supports up to 3.
vasp_input_set (VaspInputSet): vasp input set to be used. Defaults to static
set with ionic relaxation parameters set. Take care if replacing this,
default ensures that ionic relaxation is done and that stress is calculated
for each vasp run.
analysis (bool): flag to indicate whether analysis task should be added
and stresses and strains passed to that task
sym_reduce (bool): Whether or not to apply symmetry reductions
tag (str):
copy_vasp_outputs (bool): whether or not to copy previous vasp outputs.
kwargs (keyword arguments): additional kwargs to be passed to get_wf_deformations
Returns:
Workflow
"""
# Convert to conventional if specified
if conventional:
structure = SpacegroupAnalyzer(
structure).get_conventional_standard_structure()
uis_elastic = {
"IBRION": 2,
"NSW": 99,
"ISIF": 2,
"ISTART": 1,
"PREC": "High"
}
vis = vasp_input_set or MPStaticSet(structure,
user_incar_settings=uis_elastic)
strains = []
if strain_states is None:
strain_states = get_default_strain_states(order)
if stencils is None:
stencils = [np.linspace(-0.01, 0.01, 5 +
(order - 2) * 2)] * len(strain_states)
if np.array(stencils).ndim == 1:
stencils = [stencils] * len(strain_states)
for state, stencil in zip(strain_states, stencils):
strains.extend(
[Strain.from_voigt(s * np.array(state)) for s in stencil])
# Remove zero strains
strains = [strain for strain in strains if not (abs(strain) < 1e-10).all()]
# Adding the zero strains for the purpose of calculating at finite pressure or thermal expansion
_strains = [Strain.from_deformation([[1, 0, 0], [0, 1, 0], [0, 0, 1]])]
strains.extend(_strains)
"""
"""
vstrains = [strain.voigt for strain in strains]
if np.linalg.matrix_rank(vstrains) < 6:
# TODO: check for sufficiency of input for nth order
raise ValueError(
"Strain list is insufficient to fit an elastic tensor")
deformations = [s.get_deformation_matrix() for s in strains]
"""
print(strains)
print(deformations)
"""
if sym_reduce:
# Note this casts deformations to a TensorMapping
# with unique deformations as keys to symmops
deformations = symmetry_reduce(deformations, structure)
wf_elastic = get_wf_deformations(structure,
deformations,
tag=tag,
db_file=db_file,
vasp_input_set=vis,
copy_vasp_outputs=copy_vasp_outputs,
**kwargs)
if analysis:
defo_fws_and_tasks = get_fws_and_tasks(
wf_elastic,
fw_name_constraint="deformation",
task_name_constraint="Transmuted")
for idx_fw, idx_t in defo_fws_and_tasks:
defo = \
wf_elastic.fws[idx_fw].tasks[idx_t]['transformation_params'][0][
'deformation']
pass_dict = {
'strain': Deformation(defo).green_lagrange_strain.tolist(),
'stress': '>>output.ionic_steps.-1.stress',
'deformation_matrix': defo
}
if sym_reduce:
pass_dict.update({'symmops': deformations[defo]})
mod_spec_key = "deformation_tasks->{}".format(idx_fw)
pass_task = pass_vasp_result(pass_dict=pass_dict,
mod_spec_key=mod_spec_key)
wf_elastic.fws[idx_fw].tasks.append(pass_task)
fw_analysis = Firework(ElasticTensorToDb(structure=structure,
db_file=db_file,
order=order,
fw_spec_field='tags',
metadata=metadata,
vasp_input_set=vis),
name="Analyze Elastic Data",
spec={"_allow_fizzled_parents": True})
wf_elastic.append_wf(Workflow.from_Firework(fw_analysis),
wf_elastic.leaf_fw_ids)
wf_elastic.name = "{}:{}".format(structure.composition.reduced_formula,
"elastic constants")
return wf_elastic
def get_wf_elastic_constant(structure, strain_states=None, stencils=None,
db_file=None,
conventional=False, order=2, vasp_input_set=None,
analysis=True,
sym_reduce=False, tag='elastic',
copy_vasp_outputs=False, **kwargs):
"""
Returns a workflow to calculate elastic constants.
Firework 1 : write vasp input set for structural relaxation,
run vasp,
pass run location,
database insertion.
Firework 2 - number of total deformations: Static runs on the deformed structures
last Firework : Analyze Stress/Strain data and fit the elastic tensor
Args:
structure (Structure): input structure to be optimized and run.
strain_states (list of Voigt-notation strains): list of ratios of nonzero elements
of Voigt-notation strain, e. g. [(1, 0, 0, 0, 0, 0), (0, 1, 0, 0, 0, 0), etc.].
stencils (list of floats, or list of list of floats): values of strain to multiply
by for each strain state, i. e. stencil for the perturbation along the strain
state direction, e. g. [-0.01, -0.005, 0.005, 0.01]. If a list of lists,
stencils must correspond to each strain state provided.
db_file (str): path to file containing the database credentials.
conventional (bool): flag to convert input structure to conventional structure,
defaults to False.
order (int): order of the tensor expansion to be determined. Defaults to 2 and
currently supports up to 3.
vasp_input_set (VaspInputSet): vasp input set to be used. Defaults to static
set with ionic relaxation parameters set. Take care if replacing this,
default ensures that ionic relaxation is done and that stress is calculated
for each vasp run.
analysis (bool): flag to indicate whether analysis task should be added
and stresses and strains passed to that task
sym_reduce (bool): Whether or not to apply symmetry reductions
tag (str):
copy_vasp_outputs (bool): whether or not to copy previous vasp outputs.
kwargs (keyword arguments): additional kwargs to be passed to get_wf_deformations
Returns:
Workflow
"""
# Convert to conventional if specified
if conventional:
structure = SpacegroupAnalyzer(
structure).get_conventional_standard_structure()
uis_elastic = {"IBRION": 2, "NSW": 99, "ISIF": 2, "ISTART": 1,
"PREC": "High"}
vis = vasp_input_set or MPStaticSet(structure,
user_incar_settings=uis_elastic)
strains = []
if strain_states is None:
strain_states = get_default_strain_states(order)
if stencils is None:
stencils = [np.linspace(-0.01, 0.01, 5 + (order - 2) * 2)] * len(
strain_states)
if np.array(stencils).ndim == 1:
stencils = [stencils] * len(strain_states)
for state, stencil in zip(strain_states, stencils):
strains.extend(
[Strain.from_voigt(s * np.array(state)) for s in stencil])
# Remove zero strains
strains = [strain for strain in strains if not (abs(strain) < 1e-10).all()]
vstrains = [strain.voigt for strain in strains]
if np.linalg.matrix_rank(vstrains) < 6:
# TODO: check for sufficiency of input for nth order
raise ValueError("Strain list is insufficient to fit an elastic tensor")
deformations = [s.get_deformation_matrix() for s in strains]
if sym_reduce:
# Note this casts deformations to a TensorMapping
# with unique deformations as keys to symmops
deformations = symmetry_reduce(deformations, structure)
wf_elastic = get_wf_deformations(structure, deformations, tag=tag,
db_file=db_file,
vasp_input_set=vis,
copy_vasp_outputs=copy_vasp_outputs,
**kwargs)
if analysis:
defo_fws_and_tasks = get_fws_and_tasks(wf_elastic,
fw_name_constraint="deformation",
task_name_constraint="Transmuted")
for idx_fw, idx_t in defo_fws_and_tasks:
defo = \
wf_elastic.fws[idx_fw].tasks[idx_t]['transformation_params'][0][
'deformation']
pass_dict = {
'strain': Deformation(defo).green_lagrange_strain.tolist(),
'stress': '>>output.ionic_steps.-1.stress',
'deformation_matrix': defo}
if sym_reduce:
pass_dict.update({'symmops': deformations[defo]})
mod_spec_key = "deformation_tasks->{}".format(idx_fw)
pass_task = pass_vasp_result(pass_dict=pass_dict,
mod_spec_key=mod_spec_key)
wf_elastic.fws[idx_fw].tasks.append(pass_task)
fw_analysis = Firework(
ElasticTensorToDb(structure=structure, db_file=db_file,
order=order, fw_spec_field='tags'),
name="Analyze Elastic Data", spec={"_allow_fizzled_parents": True})
wf_elastic.append_wf(Workflow.from_Firework(fw_analysis),
wf_elastic.leaf_fw_ids)
wf_elastic.name = "{}:{}".format(structure.composition.reduced_formula,
"elastic constants")
return wf_elastic
def process_elastic_calcs(opt_doc, defo_docs, add_derived=True, tol=0.002):
"""
Generates the list of calcs from deformation docs, along with 'derived
stresses', i. e. stresses derived from symmop transformations of existing
calcs from transformed strains resulting in an independent strain
not in the input list
Args:
opt_doc (dict): document for optimization task
defo_docs ([dict]) list of documents for deformation tasks
add_derived (bool): flag for whether or not to add derived
stress-strain pairs based on symmetry
tol (float): tolerance for assigning equivalent stresses/strains
Returns ([dict], [dict]):
Two lists of summary documents corresponding to strains
and stresses, one explicit and one derived
"""
structure = Structure.from_dict(opt_doc['output']['structure'])
input_structure = Structure.from_dict(opt_doc['input']['structure'])
# Process explicit calcs, store in dict keyed by strain
explicit_calcs = TensorMapping()
for doc in defo_docs:
calc = {
"type": "explicit",
"input": doc["input"],
"output": doc["output"],
"task_id": doc["task_id"],
"completed_at": doc["completed_at"]
}
deformed_structure = Structure.from_dict(doc['output']['structure'])
defo = Deformation(calculate_deformation(structure,
deformed_structure))
# Warning if deformation is not equivalent to stored deformation
stored_defo = doc['transmuter']['transformation_params'][0]\
['deformation']
if not np.allclose(defo, stored_defo, atol=1e-5):
wmsg = "Inequivalent stored and calc. deformations."
logger.debug(wmsg)
calc["warnings"] = wmsg
cauchy_stress = -0.1 * Stress(doc['output']['stress'])
pk_stress = cauchy_stress.piola_kirchoff_2(defo)
strain = defo.green_lagrange_strain
calc.update({
"deformation": defo,
"cauchy_stress": cauchy_stress,
"strain": strain,
"pk_stress": pk_stress
})
if strain in explicit_calcs:
existing_value = explicit_calcs[strain]
if doc['completed_at'] > existing_value['completed_at']:
explicit_calcs[strain] = calc
else:
explicit_calcs[strain] = calc
if not add_derived:
return explicit_calcs.values(), None
# Determine all of the implicit calculations to include
sga = SpacegroupAnalyzer(structure, symprec=0.1)
symmops = sga.get_symmetry_operations(cartesian=True)
derived_calcs_by_strain = TensorMapping(tol=0.002)
for strain, calc in explicit_calcs.items():
# Generate all transformed strains
task_id = calc['task_id']
tstrains = [(symmop, strain.transform(symmop)) for symmop in symmops]
# Filter strains by those which are independent and new
# For second order
if len(explicit_calcs) < 30:
tstrains = [(symmop, tstrain) for symmop, tstrain in tstrains
if tstrain.get_deformation_matrix().is_independent(tol)
and not tstrain in explicit_calcs]
# For third order
else:
strain_states = get_default_strain_states(3)
# Default stencil in atomate, this maybe shouldn't be hard-coded
stencil = np.linspace(-0.075, 0.075, 7)
valid_strains = [
Strain.from_voigt(s * np.array(strain_state))
for s, strain_state in product(stencil, strain_states)
]
valid_strains = [v for v in valid_strains if not np.allclose(v, 0)]
valid_strains = TensorMapping(valid_strains,
[True] * len(valid_strains))
tstrains = [
(symmop, tstrain) for symmop, tstrain in tstrains
if tstrain in valid_strains and not tstrain in explicit_calcs
]
# Add surviving tensors to derived_strains dict
for symmop, tstrain in tstrains:
# curr_set = derived_calcs_by_strain[tstrain]
if tstrain in derived_calcs_by_strain:
curr_set = derived_calcs_by_strain[tstrain]
curr_task_ids = [c[1] for c in curr_set]
if task_id not in curr_task_ids:
curr_set.append((symmop, calc['task_id']))
else:
derived_calcs_by_strain[tstrain] = [(symmop, calc['task_id'])]
# Process derived calcs
explicit_calcs_by_id = {d['task_id']: d for d in explicit_calcs.values()}
derived_calcs = []
for strain, calc_set in derived_calcs_by_strain.items():
symmops, task_ids = zip(*calc_set)
task_strains = [
Strain(explicit_calcs_by_id[task_id]['strain'])
for task_id in task_ids
]
task_stresses = [
explicit_calcs_by_id[task_id]['cauchy_stress']
for task_id in task_ids
]
derived_strains = [
tstrain.transform(symmop)
for tstrain, symmop in zip(task_strains, symmops)
]
for derived_strain in derived_strains:
if not np.allclose(derived_strain, strain, atol=2e-3):
logger.info("Issue with derived strains")
raise ValueError("Issue with derived strains")
derived_stresses = [
tstress.transform(sop)
for sop, tstress in zip(symmops, task_stresses)
]
input_docs = [{
"task_id": task_id,
"strain": task_strain,
"cauchy_stress": task_stress,
"symmop": symmop
} for task_id, task_strain, task_stress, symmop in zip(
task_ids, task_strains, task_stresses, symmops)]
calc = {
"strain": strain,
"cauchy_stress": Stress(np.average(derived_stresses, axis=0)),
"deformation": strain.get_deformation_matrix(),
"input_tasks": input_docs,
"type": "derived"
}
calc['pk_stress'] = calc['cauchy_stress'].piola_kirchoff_2(
calc['deformation'])
derived_calcs.append(calc)
return list(explicit_calcs.values()), derived_calcs
