Source code for pm4py.simulation.tree_playout.variants.topbottom

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from pm4py.objects.process_tree.obj import Operator
from pm4py.util import exec_utils, constants, xes_constants
from pm4py.objects.log.obj import EventLog, Trace, Event
from enum import Enum
import random
import time

[docs]class Parameters(Enum): ACTIVITY_KEY = constants.PARAMETER_CONSTANT_ACTIVITY_KEY NO_TRACES = "num_traces"
[docs]def apply(tree, parameters=None): """ Gets the top-bottom playout of a process tree Parameters --------------- tree Process tree parameters Parameters of the algorithm, including: - Parameters.ACTIVITY_KEY: activity key - Parameters.NO_TRACES: number of traces that should be returned Returns --------------- log Event log """ if parameters is None: parameters = {} activity_key = exec_utils.get_param_value(Parameters.ACTIVITY_KEY, parameters, xes_constants.DEFAULT_NAME_KEY) no_traces = exec_utils.get_param_value(Parameters.NO_TRACES, parameters, 1000) execution_sequences = get_num_ex_sequences(tree, no_traces) log = EventLog() for seq in execution_sequences: trace = Trace() for el in seq: if el.label is not None: event = Event({activity_key: el.label}) trace.append(event) log.append(trace) return log
[docs]def get_ex_seq_in_time(tree, ex_time): """ Gets the maximum number of execution sequences, doing the playout, in the given amount of time Parameters ---------------- tree Process tree ex_time Maximum execution time Returns ---------------- ex_sec Execution sequences """ ex_sec = [] aa = time.time() while time.time() - aa < ex_time: ex_sec.append(tuple(get_ex_seq(tree))) return ex_sec
[docs]def get_num_ex_sequences(tree, num): """ Gets the specified amount of execution sequences Parameters --------------- tree Process tree num Number of execution sequences Returns --------------- ex_sec Execution sequences """ ret = [] for i in range(num): ret.append(tuple(get_ex_seq(tree))) return ret
[docs]def get_ex_seq(tree): """ Gets a trace from a process tree (top-bottom) Parameters -------------- tree Process tree Returns ------------- ex_seq Execution sequence """ if tree.operator is None: return [tree] elif tree.operator is Operator.XOR: child = random.choice(tree.children) return get_ex_seq(child) elif tree.operator is Operator.SEQUENCE: ret = [] for child in tree.children: ret = ret + get_ex_seq(child) return ret elif tree.operator is Operator.LOOP: ret = [] cont = True while cont: cont = False ret = ret + get_ex_seq(tree.children[0]) r = random.random() if r <= 0.5: ret = ret + get_ex_seq(tree.children[1]) cont = True return ret elif tree.operator is Operator.PARALLEL: ret = [] children_traces = [] list_choices = [] for index, child in enumerate(tree.children): trace = get_ex_seq(child) children_traces.append(trace) list_choices += [index] * len(trace) random.shuffle(list_choices) for c in list_choices: act = children_traces[c].pop(0) ret.append(act) return ret