// eventually be encountered and we'll account for it then.
if (!relation.headNode().word().equals(focusWord))
continue;
RelationTuple relationKey = new RelationTuple(
focusIndex, relation.relation().intern());
SparseDoubleVector relationVector = localTuples.get(
relationKey);
if (relationVector == null) {
relationVector = new CompactSparseVector();
localTuples.put(relationKey, relationVector);