Difference between revisions of "Earley-based structural transfer for Apertium"
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Perhaps [ |
Perhaps [http://en.wikipedia.org/wiki/Earley's_algorithm Earley's algorithm] to parse context-free grammars (which has a left-to-right longest-match philosophy as Apertium) could be used to perform more complex syntactical transformations; this could be useful for distant language pairs containing embedded structures. |
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Open questions |
==Open questions== |
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* Currently, Apertium uses text streams to communicate. I assume this would not be possible here. |
* Currently, Apertium uses text streams to communicate. I assume this would not be possible here. |
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* When would one call the bilingual dictionary? Apertium Level 2 calls it in the first stage. |
* <s>When would one call the bilingual dictionary? Apertium Level 2 calls it in the first stage.</s> |
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* We should check whether this has been done before. |
* We should check whether this has been done before. |
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::The English → Urdu translation system linked [[Specific resources per language#Urdu|here]] seems to use LFG and Earley-based parsing. |
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* In case there is more than one parse of a sentence, there should be a way to select the most likely. |
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==Existing parsers== |
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{{main|Parsers}} |
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Current free-software parsers which might be worth looking at: |
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* [http://www.agfl.cs.ru.nl/ AGFL parser] (GPL) |
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==Further reading== |
==Further reading== |
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* Koichi Takeda [http://acl.ldc.upenn.edu/P/P96/P96-1020.pdf Pattern-Based Context-Free Grammars for Machine Translation] (private access) |
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* [http://66.102.9.104/search?q=cache:GwOQsQtddJIJ:www.isi.edu/natural-language/mt/hlt-naacl-06-zhang.pdf+earley%27s+algorithm+machine+translation&hl=en&ct=clnk&cd=3&client=iceweasel-a http://www.isi.edu/natural-language/mt/hlt-naacl-06-zhang.pdf] |
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:This paper proposes the use of "pattern-based" context-free grammars as a basis for building machine translation (MT) systems. |
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* [http://66.102.9.104/search?q=cache:PZewJi8kmc0J:www.slt.atr.jp/IWSLT2006/proceedings/EC_13_NTT.pdf+earley+algorithm+%22machine+translation%22&hl=en&ct=clnk&cd=5&client=iceweasel-a http://www.slt.atr.jp/IWSLT2006/proceedings/EC_13_NTT.pdf] |
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* Randall Sharp and Oliver Streiter [http://www.iai.uni-sb.de/docs/meta93.pdf Simplifying the Complexity of Machine Translation] |
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* J. Earley, (1970) "[http://portal.acm.org/citation.cfm?doid=362007.362035 An efficient context-free parsing algorithm]", ''Communications of the Association for Computing Machinery'', 13:2:94--102, 1970. |
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[[Category:Development]] |
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[[Category:Documentation in English]] |
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[[Category:Transfer]] |
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Latest revision as of 21:21, 2 October 2013
Perhaps Earley's algorithm to parse context-free grammars (which has a left-to-right longest-match philosophy as Apertium) could be used to perform more complex syntactical transformations; this could be useful for distant language pairs containing embedded structures.
Open questions[edit]
- Currently, Apertium uses text streams to communicate. I assume this would not be possible here.
When would one call the bilingual dictionary? Apertium Level 2 calls it in the first stage.- We should check whether this has been done before.
- The English → Urdu translation system linked here seems to use LFG and Earley-based parsing.
- In case there is more than one parse of a sentence, there should be a way to select the most likely.
Existing parsers[edit]
- Main article: Parsers
Current free-software parsers which might be worth looking at:
- AGFL parser (GPL)
Further reading[edit]
- Koichi Takeda Pattern-Based Context-Free Grammars for Machine Translation (private access)
- This paper proposes the use of "pattern-based" context-free grammars as a basis for building machine translation (MT) systems.
- Randall Sharp and Oliver Streiter Simplifying the Complexity of Machine Translation
- J. Earley, (1970) "An efficient context-free parsing algorithm", Communications of the Association for Computing Machinery, 13:2:94--102, 1970.
