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The NYUAD Arabic UD treebank is based on the Penn Arabic Treebank (PATB), parts 1, 2, and 3, through conversion to CATiB dependency trees.


The treebank consists of 19,738 sentences (738889 tokens), and its domain is mainly newswire. The annotation is licensed under the terms of CC BY-SA 4.0, and the original PATB can be obtained from the LDC’s official website.

The morphological and syntactic annotation of the NYUAD Arabic UD treebank is created through automatic conversion of the PATB data.


We would like to thank the Linguistic Data Consortium's Arabic language group, and particularly Dr. Mohamed Maamouri and Drs Ann Bies and Seth Kulick, as well as the rest of the annotation team who participated in creating the Penn Arabic Treebank. We also would like to thank Reem Faraj, Ryan Roth and the annotators of the Columbia Arabic Treebank. The development of the the NYUAD Arabic UD treebank relied heavily on these two efforts.

Data Splits

The data was split into Train, Dev, and Test according to the LDC Arabic treebanks and associated corpora: Data divisions manual (Diab, Mona, Nizar Habash, Owen Rambow, and Ryan Roth. arXiv preprint arXiv:1309.5652 (2013))


Due to LDC licensing restrictions, the annotations are released without the data. To merge the annotation with the corresponding PATB data, please follow the following steps:

  1. obtain a copy of the PATB data from the LDC website: PATB Part 1, v4.1: PATB Part 2, v3.1: PATB Part 3, v3.2:
  2. combine all the integrated files from all three treebanks in one directory. Note: if you don’t have all three treebank, the trees coming from them will be left as is.
  3. Run the following command: java -jar merge.jar


Train Tree count: 15,789 Word count: 590,819 Token count: 502,991 Dep. relations: 28 of which 3 language specific POS tags: 16 Category=value feature pairs: 28

Dev Tree count: 1,986 Word count: 73,945 Token count: 63,136 Dep. relations: 28 of which 3 language specific POS tags: 16 Category=value feature pairs: 27

Test Tree count: 1,963 Word count: 74,125 Token count: 63,168 Dep. relations: 28 of which 3 language specific POS tags: 16 Category=value feature pairs: 27


  • 2017-11-15 v2.1
    • No change.
  • 2017-03-01 v2.0
    • Initial UD release.

=== Machine-readable metadata (DO NOT REMOVE!) ================================ Data available since: UD v2.0 License: CC BY-SA 4.0 Includes text: no Genre: news Lemmas: converted from manual UPOS: converted from manual XPOS: manual native Features: converted from manual Relations: converted from manual Contributors: Habash, Nizar; Taji, Dima Contributing: elsewhere Contact: