Paper: A Single Generative Model for Joint Morphological Segmentation and Syntactic Parsing

ACL ID P08-1043
Title A Single Generative Model for Joint Morphological Segmentation and Syntactic Parsing
Venue Annual Meeting of the Association of Computational Linguistics
Session Main Conference
Year 2008
Authors

Morphological processes in Semitic languages deliver space-delimited words which intro- duce multiple, distinct, syntactic units into the structure of the input sentence. These words are in turn highly ambiguous, breaking the assumption underlying most parsers that the yield of a tree for a given sentence is known in advance. Here we propose a single joint model for performing both morphological segmenta- tion and syntactic disambiguation which by- passes the associated circularity. Using a tree- bank grammar, a data-driven lexicon, and a linguistically motivated unknown-tokens han- dling technique our model outperforms previ- ous pipelined, integrated or factorized systems for Hebrew morphological and syntactic pro- cessing, yielding an error reduction of 12% over the best published resul...