Source code for pm4py.algo.transformation.ocel.graphs.object_cobirth_graph

'''
    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 cobirth graph. This is calculated as follows: - Given the set of objects related to an event, they belong to two different categories: - The "seen" objects (they have appeared in some earlier event) - The "unseen" objects (they appear for the first time in the current event). - Every "unseen" object is connected to every "unseen" object Parameters ----------------- ocel Object-centric event log parameters Parameters of the algorithm Returns ------------------ object_cobirth_graph Object cobirth 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() 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