Next: Summary Up: Head driven bottom-up Previous: A uniform architecture
Some experimental results
In this section we will give some experimental results achieved with a specific version of the generation algorithm described here. This version is implemented in Sicstus Prolog by Herbert Ruessink and the author and runs on a DEC RISC workstation 3100. In the appendix a DCG grammar for a fragment of Dutch is defined. This grammar is compiled into a bottom up parser and a head driven bottom up generator. The small grammar handles the following types of construction:
- topicalization
- verb second
- subcategorization
- cross serial dependencies
- subject and object control verbs
- auxiliaries
- some idioms
- extraposition
The algorithm is also in use in a more elaborated system: the MiMo2 research MT system.
Usual generation times for this system that contains grammars for Dutch, English
and Spanish with a much broader coverage and larger lexicon are satisfactory.
However generation times can increase dramatically if analyses are defined where the
logical form is build in a non-compositional way.
Gertjan van Noord
Fri Nov 25 13:07:08 MET 1994