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Universal Dependencies for Arabic

What it is about

The paper presents NUDAR, a Universal Dependencies treebank for Modern Standard Arabic of 738,889 tokens in 19,738 sentences, made by converting the Penn Arabic Treebank (parts 1–3). The conversion runs in two steps: the phrase trees become the richer CATiB++ dependency format, with dashtags and morphology, and then rules map labels and structure to UD. The paper lists the main decisions: coordination is flat with the first conjunct as head; numbers are headed by the noun they count (nummod), with compound for numerals inside large numbers; proper names are flat:name; prepositions attach low as case; a copula attaches to its predicate; and the possessive construct is nmod:poss. On a manually checked sample the conversion scores LAS 98.0 and UAS 99.1 on test. A MaltParser trained on NUDAR reaches LAS 81.9, below the CATiB parser on its own space (83.1), and converting the CATiB parser's output to NUDAR loses more (LAS 75.3), since the converted output lacks the dashtags the conversion needs.

Ideas

For Mova

I1 is a check in world and prag, and a rule in Syntax: the clause and the sentence. I2 goes into The lexicon and Nouns, adjectives, pronouns and numerals. I3 is a design rule for tools/hbo and macula prag. I4 is a test protocol for macula compare and for any Arabic conversion in treebanks/ar.

Topics: Universal Dependencies

Cite

The paper itself, not this card. BibTeX from the library's record of the work. DOI 10.18653/v1/w17-1320

@inproceedings{taji2017universal,
  title = {{Universal Dependencies for Arabic}},
  author = {Taji, Dima and Habash, Nizar and Zeman, Daniel},
  booktitle = {Proceedings of the Third Arabic Natural Language Processing Workshop},
  year = {2017},
  doi = {10.18653/v1/w17-1320},
  url = {https://doi.org/10.18653/v1/w17-1320}
}

References

50 references, 10 of them with a card of ours. ↗ leads to the work, «find» searches for one we have no id for yet.

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