Learning PP attachment for filtering prosodic phrasing

Authors:
Olga van Herwijnen;Jacques Terken;Antal van den Bosch;Erwin Marsi
Affiliations:
Eindhoven University of Technology, MB Eindhoven, The Netherlands;Eindhoven University of Technology, MB Eindhoven, The Netherlands;Tilburg University, LE Tilburg, The Netherlands;Tilburg University, LE Tilburg, The Netherlands
Venue:
EACL '03 Proceedings of the tenth conference on European chapter of the Association for Computational Linguistics - Volume 1
Year:
2003

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Abstract

We explore learning prepositional-phrase attachment in Dutch, to use it as a filter in prosodic phrasing. From a syntactic treebank of spoken Dutch we extract instances of the attachment of prepositional phrases to either a governing verb or noun. Using cross-validated parameter and feature selection, we train two learning algorithms, IB 1 and RIPPER, on making this distinction, based on unigram and bigram lexical features and a cooccurrence feature derived from WWW counts. We optimize the learning on noun attachment, since in a second stage we use the attachment decision for blocking the incorrect placement of phrase boundaries before prepositional phrases attached to the preceding noun. On noun attachment, IB 1 attains an F-score of 82; RIPPER an F-score of 78. When used as a filter for prosodic phrasing, using attachment decisions from IB 1 yields the best improvement on precision (by six points to 71) on phrase boundary placement.