ProbNN
is not calculated anyways for 2015 data for TupleToolPid
even if you do so;
TupleToolANNPid
with ANNPIDTunes = ["MC15TuneV1"]
property (this is the most-up-to-date version of the tuning that should be used for all Run 2 data);
ProbNNmu
is calculated for particles that satisfy isMuon
only;