'''
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/>.
'''
import random
from copy import copy
from pm4py.objects.log.obj import EventStream, EventLog
[docs]def sample_stream(event_log, no_events=100):
"""
Randomly sample a fixed number of events from the original event log
Parameters
-----------
event_log
Event log
no_events
Number of events that the sample should have
Returns
-----------
newLog
Filtered log
"""
new_log = EventStream(attributes=event_log.attributes, extensions=event_log.extensions, globals=event_log.omni_present,
classifiers=event_log.classifiers)
new_log._list = random.sample(event_log, min(no_events, len(event_log)))
return new_log
[docs]def sample_log(log, no_traces=100):
"""
Randomly sample a fixed number of traces from the original log
Parameters
-----------
log
Log
no_traces
Number of traces that the sample should have
Returns
-----------
newLog
Filtered log
"""
new_log = EventLog(attributes=log.attributes, extensions=log.extensions, globals=log.omni_present,
classifiers=log.classifiers, properties=log.properties)
new_log._list = random.sample(log, min(no_traces, len(log)))
return new_log
[docs]def sample(log, n=100):
"""
Randomly sample a fixed number of traces from the original log
Parameters
-----------
log
Trace/event log
n
Number of elements that the sample should have
Returns
-----------
newLog
Filtered log
"""
if type(log) is EventLog:
return sample_log(log, no_traces=n)
return sample_stream(log, no_events=n)