'''
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 numpy.random import choice
[docs]def pick_transition(et, smap):
"""
Pick a transition in a set of transitions based on the weights
specified by the stochastic map
Parameters
--------------
et
Enabled transitions
smap
Stochastic map
Returns
--------------
trans
Transition chosen according to the weights
"""
wmap = {ct: smap[ct].get_weight() if ct in smap else 1.0 for ct in et}
wmap_sv = sum(wmap.values())
list_of_candidates = []
probability_distribution = []
for ct in wmap:
list_of_candidates.append(ct)
if wmap_sv == 0:
probability_distribution.append(1.0/float(len(wmap)))
else:
probability_distribution.append(wmap[ct] / wmap_sv)
ct = list(choice(et, 1, p=probability_distribution))[0]
return ct