To what extent does sentence-internal realisation reflect discourse context?: a study on word order

Authors:
Sina Zarrieß;Jonas Kuhn;Aoife Cahill
Affiliations:
Institut für maschinelle Sprachverarbeitung University of Stuttgart, Germany;Institut für maschinelle Sprachverarbeitung University of Stuttgart, Germany;Educational Testing Service Princeton, NJ
Venue:
EACL '12 Proceedings of the 13th Conference of the European Chapter of the Association for Computational Linguistics
Year:
2012

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Abstract

We compare the impact of sentence-internal vs. sentence-external features on word order prediction in two generation settings: starting out from a discriminative surface realisation ranking model for an LFG grammar of German, we enrich the feature set with lexical chain features from the discourse context which can be robustly detected and reflect rough grammatical correlates of notions from theoretical approaches to discourse coherence. In a more controlled setting, we develop a constituent ordering classifier that is trained on a German treebank with gold coreference annotation. Surprisingly, in both settings, the sentence-external features perform poorly compared to the sentence-internal ones, and do not improve over a baseline model capturing the syntactic functions of the constituents.