Dialog-Context Dependent Language Modeling Combining N-Grams And Stochastic Context-Free Grammars (2001)
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BibTeX
@MISC{Hacioglu01dialog-contextdependent,
author = {Kadri Hacioglu and Wayne Ward},
title = {Dialog-Context Dependent Language Modeling Combining N-Grams And Stochastic Context-Free Grammars},
year = {2001}
}
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Abstract
In this paper, we present our research on dialog dependent language modeling. In accordance with a speech (or sentence) production model in a discourse we split language modeling into two components; namely, dialog dependent concept modeling and syntactic modeling. The concept model is conditioned on the last question prompted by the dialog system and it is structured using #-grams. The syntactic model , which consists of a collection of stochastic context-free grammars one for each concept, describes word sequences that may be used to express the concepts. The resulting LM is evaluated by rescoring #-best lists. We report significant perplexity improvement with moderate word error rate drop within the context of CU Communicator System; a dialog system for making travel plans by accessing information about flights, hotels and car rentals.
