'''
This file is part of PM4Py (More Info: https://pm4py.fit.fraunhofer.de).
PM4Py is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
PM4Py is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with PM4Py. If not, see <https://www.gnu.org/licenses/>.
'''
from pm4py.objects.ocel.obj import OCEL
from typing import Optional, Dict, Any, Set, Tuple
[docs]def apply(ocel: OCEL, parameters: Optional[Dict[Any, Any]] = None) -> Set[Tuple[str, str]]:
"""
Calculates the object codeath graph.
This is calculated like the object cobirth graph, but visiting the list of events
in the reverse order.
Parameters
-----------------
ocel
Object-centric event log
parameters
Parameters of the algorithm
Returns
------------------
object_codeath_graph
Object codeath graph (undirected)
"""
if parameters is None:
parameters = {}
graph = set()
ordered_events = list(ocel.events[ocel.event_id_column])
ev_rel_obj = ocel.relations.groupby(ocel.event_id_column)[ocel.object_id_column].apply(list).to_dict()
set_objects = set()
ordered_events.reverse()
for ev in ordered_events:
rel_obj = ev_rel_obj[ev]
rel_obj_seen = {x for x in rel_obj if x in set_objects}
rel_obj_unseen = {x for x in rel_obj if x not in rel_obj_seen}
for o1 in rel_obj_unseen:
for o2 in rel_obj_unseen:
if o1 < o2:
graph.add((o1, o2))
for obj in rel_obj_unseen:
set_objects.add(obj)
return graph