A Probabilistic Context-free Grammar for Disambiguation in Morphological Parsing

One of the major problems one is faced with when decomposing words into their constituent parts is ambiguity: the generation of multiple analyses for one input word, many of which are implausible. In order to deal with ambiguity, the MORphological PArser MORPA is provided with a probabilistic context-free grammar (PCFG), i.e. it combines a "conventional" context-free morphological grammar to filter out ungrammatical segmentations with a probability-based scoring function which determines the likelihood of each successful parse. Consequently, remaining analyses can be ordered along a scale of plausibility. Test performance data will show that a PCFG yields good results in morphological parsing. MORPA is a fully implemented parser developed for use in a text-to-speech conversion system.

• Type: Conference
• Year: 1993
• Where: EACL
• Authors: Josée S. Heemskerk
• Keywords: Context-free Morphological Grammar, EACL 1993, MORphological PArser MORPA, Natural Language Processing, Probabilistic Context-free Grammar