IMT Atlantique - IMT Atlantique Bretagne-Pays de la Loire (Campus Brest : Technopôle Brest-Iroise CS 8381829238 BREST Cedex 3 -
Campus Nantes : 4, rue Alfred Kastler- La chantrerie 44300 NANTES -
Campus Rennes : 2 Rue de la Châtaigneraie, 35510 CESSON SEVIGNE - France)
Abstract : In this paper, we propose an integrated approach for system combination named Driven Decoding Algorithm (DDA). It consists in guiding the search algorithm of a primary ASR system by the outputs of a auxiliary systems. We first evaluate this method in simple configuration in which the primary search is driven by the one-best hypothesis of a single auxiliary system. Then, we generalize DDA to confusion-network driven decoding and we propose a general combination schemes for multiple system combination. The proposed extended DDA is evaluated using 3 ASR systems from different labs. Results show that generalized-DDA outperforms significantly ROVER method : we obtain a 15.7% relative word error rate improvement with respect to the best single system, as opposed to 8.5% with the ROVER combination.
Benjamin Lecouteux, Georges Linarès, Yannick Estève, Guillaume Gravier. Combinaison de systèmes par décodage guidé. JEP / TALN / RECITAL 2008, Jun 2008, Avignon, France. 〈hal-01318091〉
