16. The method according to claim 1 , wherein converting the indexing structure into the output comprises performing an intra-word clustering step.
16. The method according to claim 1 , wherein converting the indexing structure into the output comprises performing an intra-word clustering step. 17. The method according to claim 16 , wherein performing the intra-word clustering step comprises merging lattice arcs of a lattice having an identical word label, and summing up posterior probabilities of the merged lattice arcs.