Source code for pm4py.algo.transformation.ocel.features.events.event_activity

from pm4py.objects.ocel.obj import OCEL
from typing import Optional, Dict, Any
from pm4py.util import pandas_utils




def apply(ocel: OCEL, parameters: Optional[Dict[Any, Any]] = None):
    """
    One-hot encode the activities of an OCEL, assigning to each event its own activity as feature

    Parameters
    ----------------
    ocel
        OCEL
    parameters
        Parameters of the algorithm

    Returns
    ----------------
    data
        Extracted feature values
    feature_names
        Feature names
    """
    if parameters is None:
        parameters = {}

    ordered_events = (
        parameters["ordered_events"]
        if "ordered_events" in parameters
        else ocel.events[ocel.event_id_column].to_numpy()
    )

    activities = pandas_utils.format_unique(
        ocel.events[ocel.event_activity].unique()
    )

    data = []
    feature_names = ["@@event_act_" + act for act in activities]

    events_activities = ocel.events[
        [ocel.event_id_column, ocel.event_activity]
    ].to_dict("records")
    events_activities = {
        x[ocel.event_id_column]: x[ocel.event_activity]
        for x in events_activities
    }

    for ev in ordered_events:
        data.append([0.0] * len(activities))
        data[-1][activities.index(events_activities[ev])] = 1.0

    return data, feature_names