def workflow_net(student_answer):
"""
Checks if the PetriNet in student_answer is a workflow net.
"""
# Use pm4py to check workflow net
if check_soundness.check_wfnet(student_answer):
return {'correct': True}
else:
return {
'correct':
False,
'feedback':
'The given petri-net is not a workflow net. Expected a workflow net.'
}
def apply_log_multiprocessing(log,
petri_net,
initial_marking,
final_marking,
parameters=None,
version=VERSION_STATE_EQUATION_A_STAR):
if parameters is None:
parameters = dict()
if not (check_soundness.check_wfnet(petri_net)
and check_soundness.check_relaxed_soundness_net_in_fin_marking(
petri_net, initial_marking, final_marking)):
raise Exception(
"trying to apply alignments on a Petri net that is not a relaxed sound workflow net!!"
)
activity_key = parameters[
PARAMETER_CONSTANT_ACTIVITY_KEY] if PARAMETER_CONSTANT_ACTIVITY_KEY in parameters else DEFAULT_NAME_KEY
model_cost_function = parameters[
PARAM_MODEL_COST_FUNCTION] if PARAM_MODEL_COST_FUNCTION in parameters else None
sync_cost_function = parameters[
PARAM_SYNC_COST_FUNCTION] if PARAM_SYNC_COST_FUNCTION in parameters else None
if model_cost_function is None or sync_cost_function is None:
# reset variables value
model_cost_function = dict()
sync_cost_function = dict()
for t in petri_net.transitions:
if t.label is not None:
model_cost_function[t] = align_utils.STD_MODEL_LOG_MOVE_COST
sync_cost_function[t] = 0
else:
model_cost_function[t] = 1
parameters[
pm4py.util.constants.PARAMETER_CONSTANT_ACTIVITY_KEY] = activity_key
parameters[PARAM_MODEL_COST_FUNCTION] = model_cost_function
parameters[PARAM_SYNC_COST_FUNCTION] = sync_cost_function
parameters_best_worst = copy(parameters)
if PARAM_MAX_ALIGN_TIME_TRACE in parameters_best_worst:
del parameters_best_worst[PARAM_MAX_ALIGN_TIME_TRACE]
best_worst_cost = VERSIONS_COST[version](petri_net,
initial_marking,
final_marking,
parameters=parameters_best_worst)
variants_idxs = parameters[
VARIANTS_IDX] if VARIANTS_IDX in parameters else None
if variants_idxs is None:
variants_idxs = variants_module.get_variants_from_log_trace_idx(
log, parameters=parameters)
variants_list = [[x, len(y)] for x, y in variants_idxs.items()]
no_cores = mp.cpu_count()
petri_net_string = petri_exporter.export_petri_as_string(
petri_net, initial_marking, final_marking)
n = math.ceil(len(variants_list) / no_cores)
variants_list_split = list(chunks(variants_list, n))
# Define an output queue
output = mp.Queue()
processes = [
mp.Process(target=VERSIONS_VARIANTS_LIST_MPROCESSING[version](
output, x, petri_net_string, parameters=parameters))
for x in variants_list_split
]
# Run processes
for p in processes:
p.start()
results = []
for p in processes:
result = output.get()
results.append(result)
al_idx = {}
for index, el in enumerate(variants_list_split):
for index2, var_item in enumerate(el):
variant = var_item[0]
for trace_idx in variants_idxs[variant]:
al_idx[trace_idx] = results[index][variant]
alignments = []
for i in range(len(log)):
alignments.append(al_idx[i])
# assign fitness to traces
for index, align in enumerate(alignments):
if align is not None:
unfitness_upper_part = align[
'cost'] // align_utils.STD_MODEL_LOG_MOVE_COST
if unfitness_upper_part == 0:
align['fitness'] = 1
elif (len(log[index]) + best_worst_cost) > 0:
align['fitness'] = 1 - (
(align['cost'] // align_utils.STD_MODEL_LOG_MOVE_COST) /
(len(log[index]) + best_worst_cost))
else:
align['fitness'] = 0
return alignments
def apply_log(log,
petri_net,
initial_marking,
final_marking,
parameters=None,
version=VERSION_STATE_EQUATION_A_STAR):
"""
apply alignments to a log
Parameters
-----------
log
object of the form :class:`pm4py.log.log.EventLog` event log
petri_net
:class:`pm4py.objects.petri.petrinet.PetriNet` the model to use for the alignment
initial_marking
:class:`pm4py.objects.petri.petrinet.Marking` initial marking of the net
final_marking
:class:`pm4py.objects.petri.petrinet.Marking` final marking of the net
version
:class:`str` selected variant of the algorithm, possible values: {\'state_equation_a_star\'}
parameters
:class:`dict` parameters of the algorithm,
for key \'state_equation_a_star\':
pm4py.util.constants.PARAMETER_CONSTANT_ACTIVITY_KEY -> Attribute in the log that contains the activity
pm4py.algo.conformance.alignments.versions.state_equation_a_star.PARAM_MODEL_COST_FUNCTION ->
mapping of each transition in the model to corresponding synchronous costs
pm4py.algo.conformance.alignments.versions.state_equation_a_star.PARAM_SYNC_COST_FUNCTION ->
mapping of each transition in the model to corresponding model cost
pm4py.algo.conformance.alignments.versions.state_equation_a_star.PARAM_TRACE_COST_FUNCTION ->
mapping of each index of the trace to a positive cost value
Returns
-----------
alignment
:class:`list` of :class:`dict` with keys **alignment**, **cost**, **visited_states**, **queued_states** and
**traversed_arcs**
The alignment is a sequence of labels of the form (a,t), (a,>>), or (>>,t)
representing synchronous/log/model-moves.
"""
if parameters is None:
parameters = dict()
if not (check_soundness.check_wfnet(petri_net)
and check_soundness.check_relaxed_soundness_net_in_fin_marking(
petri_net, initial_marking, final_marking)):
raise Exception(
"trying to apply alignments on a Petri net that is not a relaxed sound workflow net!!"
)
start_time = time.time()
activity_key = parameters[
PARAMETER_CONSTANT_ACTIVITY_KEY] if PARAMETER_CONSTANT_ACTIVITY_KEY in parameters else DEFAULT_NAME_KEY
model_cost_function = parameters[
PARAM_MODEL_COST_FUNCTION] if PARAM_MODEL_COST_FUNCTION in parameters else None
sync_cost_function = parameters[
PARAM_SYNC_COST_FUNCTION] if PARAM_SYNC_COST_FUNCTION in parameters else None
max_align_time = parameters[
PARAM_MAX_ALIGN_TIME] if PARAM_MAX_ALIGN_TIME in parameters else DEFAULT_MAX_ALIGN_TIME
max_align_time_case = parameters[
PARAM_MAX_ALIGN_TIME_TRACE] if PARAM_MAX_ALIGN_TIME_TRACE in parameters else DEFAULT_MAX_ALIGN_TIME_TRACE
if model_cost_function is None or sync_cost_function is None:
# reset variables value
model_cost_function = dict()
sync_cost_function = dict()
for t in petri_net.transitions:
if t.label is not None:
model_cost_function[t] = align_utils.STD_MODEL_LOG_MOVE_COST
sync_cost_function[t] = 0
else:
model_cost_function[t] = 1
parameters[
pm4py.util.constants.PARAMETER_CONSTANT_ACTIVITY_KEY] = activity_key
parameters[PARAM_MODEL_COST_FUNCTION] = model_cost_function
parameters[PARAM_SYNC_COST_FUNCTION] = sync_cost_function
parameters_best_worst = copy(parameters)
if PARAM_MAX_ALIGN_TIME_TRACE in parameters_best_worst:
del parameters_best_worst[PARAM_MAX_ALIGN_TIME_TRACE]
best_worst_cost = VERSIONS_COST[version](petri_net,
initial_marking,
final_marking,
parameters=parameters_best_worst)
variants_idxs = parameters[
VARIANTS_IDX] if VARIANTS_IDX in parameters else None
if variants_idxs is None:
variants_idxs = variants_module.get_variants_from_log_trace_idx(
log, parameters=parameters)
one_tr_per_var = []
variants_list = []
for index_variant, variant in enumerate(variants_idxs):
variants_list.append(variant)
for variant in variants_list:
one_tr_per_var.append(log[variants_idxs[variant][0]])
all_alignments = []
for trace in one_tr_per_var:
this_max_align_time = min(max_align_time_case,
(max_align_time -
(time.time() - start_time)) * 0.5)
parameters[PARAM_MAX_ALIGN_TIME_TRACE] = this_max_align_time
all_alignments.append(
apply_trace(trace,
petri_net,
initial_marking,
final_marking,
parameters=copy(parameters),
version=version))
al_idx = {}
for index_variant, variant in enumerate(variants_idxs):
for trace_idx in variants_idxs[variant]:
al_idx[trace_idx] = all_alignments[index_variant]
alignments = []
for i in range(len(log)):
alignments.append(al_idx[i])
# assign fitness to traces
for index, align in enumerate(alignments):
if align is not None:
unfitness_upper_part = align[
'cost'] // align_utils.STD_MODEL_LOG_MOVE_COST
if unfitness_upper_part == 0:
align['fitness'] = 1
elif (len(log[index]) + best_worst_cost) > 0:
align['fitness'] = 1 - (
(align['cost'] // align_utils.STD_MODEL_LOG_MOVE_COST) /
(len(log[index]) + best_worst_cost))
else:
align['fitness'] = 0
return alignments