public Event getHistory(TrainerEvent trainerEvent, int backOffLevel) {
ModifierEvent modEvent = (ModifierEvent) trainerEvent;
if (Language.treebank().isBaseNP(modEvent.parent()))
return getBaseNPHistory(modEvent, backOffLevel);
Symbol side = Constants.sideToSym(modEvent.side());
MutableEvent hist = historiesWithSubcats[backOffLevel];
hist.clear();
Symbol verbInterveningSym = Constants.booleanToSym(modEvent.verbIntervening());
Symbol mappedPrevModSym = NTMapper.map(modEvent.previousMods().symbolAt(0));
Symbol parent = Language.training().removeArgAugmentation(modEvent.parent());
switch (backOffLevel) {
case 0:
// for p(M(t)_i | P, H, w, t, verbIntervening, map(M_i-1), subcat, side)
hist.add(0, parent);
hist.add(0, Language.training().removeGapAugmentation(modEvent.head()));
hist.add(0, modEvent.headWord().word());
hist.add(0, modEvent.headWord().tag());
hist.add(0, verbInterveningSym);
hist.add(0, mappedPrevModSym);
hist.add(1, modEvent.subcat());
hist.add(0, side);
break;
case 1:
// for p(M(t)_i | P, H, t, verbIntervening, map(M_i-1), subcat, side)
hist.add(0, parent);
hist.add(0, Language.training().removeGapAugmentation(modEvent.head()));
hist.add(0, modEvent.headWord().tag());
hist.add(0, verbInterveningSym);
hist.add(0, mappedPrevModSym);
hist.add(1, modEvent.subcat());
hist.add(0, side);
break;
case 2:
// for p(M(t)_i | P, H, verbIntervening, map(M_i-1), subcat, side)
hist.add(0, parent);
hist.add(0, Language.training().removeGapAugmentation(modEvent.head()));
hist.add(0, verbInterveningSym);
hist.add(0, mappedPrevModSym);
hist.add(1, modEvent.subcat());
hist.add(0, side);
break;
case 3:
// for p(M(t)_i | P, subcat)
hist.add(0, parent);
hist.add(1, modEvent.subcat());
break;
}
return hist;
}
