Ideas for Google Summer of Code/Rule-based finite-state disambiguation

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Currently Apertium only has a bigram/trigram part-of-speech tagger. The objective of this task would be to implement a disambiguation framework for Apertium that can be expressed as a finite-state transducer. It might be a good idea to express this as constraint rules, in a novel XML-based file format.

For some languages, bigram/trigram POS disambiguation really doesn't work, especially when you want to disambiguate morphology (e.g. number, case) along with part-of-speech. So far we've been using constraint grammar for some of these languages. But although Constraint Grammar is great and powerful, it is also pretty slow. It would be a good idea to look at LanguageTool,[1] and IceParser[2] and Apertium's own apertium-lex-tools to get ideas on how this might be accomplished.


  • Define an XML format for writing finite-state constraint rules.
  • Write a compiler which turns these rules into a binary finite-state representation.
  • Write a processor which applies these rules to an Apertium input stream.

Coding challenge[edit]

Frequently asked questions[edit]

  • none yet, ask us something! :)

See also[edit]