} else {
// if it's not a phone, and it's not silence, it's a
// dummy node, and we don't care.
continue;
}
HMM hmm =
acousticModel.lookupNearestHMM(unit, HMMPosition.UNDEFINED, false);
Graph modelGraph = buildModelGraph((SenoneHMM)hmm);
modelGraph.validate();
hmmGraph.insertGraph(modelGraph, node);
}