Combining Intra- and Multi-sentential Rhetorical Parsing for Document-level Discourse Analysis
Shafiq Joty, Giuseppe Carenini, Raymond Ng and Yashar Mehdad
The 51st Annual Meeting of the Association for Computational Linguistics (ACL 2013)
Sofia, Bulgaria, August 4-9, 2013
We propose a novel approach for developing a two-stage document-level discourse parser. Our parser builds a discourse tree by applying an optimal parsing algorithm to probabilities inferred from two Conditional Random Fields: one for intra-sentential parsing and the other for multi-sentential parsing. We present two approaches to combine these two stages of discourse parsing effectively. A set of empirical evaluations over two different datasets demonstrates that our discourse parser significantly outperforms the state-of-the-art, often by a wide margin.
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