This is an old revision of the document!
Table of Contents
Persian (fa)
Persian Dependency Treebank (پیکرۀ وابستگی)
Versions
- “Preversion” 0.1 (January 2012, 12,200 annotated sentences)
- Final version (expected fall 2012, 30,000 sentences)
Obtaining and License
The treebank is available for free after completing the license form. The license in short:
- non-commercial research usage
- redistribution not discussed, probably not allowed
- citation of publications not specified
PDT was created by members of the Dadegan Research Group (Секция Лингвистично моделиране), Bulgarian Academy of Sciences (Българска академия на науките), Ул. Акад. Г. Бончев, Бл. 25 А, 1113 София, Bulgaria.
References
- Website
- Data
- no separate citation
- Principal publications
- Kiril Simov, Petya Osenova, Alexander Simov, Milen Kouylekov: Design and Implementation of the Bulgarian HPSG-based Treebank. In: Erhard Hinrichs, Kiril Simov (eds.): Journal of Research on Language and Computation, Special Issue, vol. 2, no. 4, pp. 495–522, Kluwer Academic Publishers, ISSN 1570-7075. 2004.
- Documentation
- Kiril Simov, Petya Osenova, Milena Slavcheva: BTB-TR03: BulTreeBank Morphosyntactic Tagset. Technical report, 2004.
- Petya Osenova, Kiril Simov: BTB-TR05: BulTreeBank Stylebook. Technical report, 2004.
- http://www.bultreebank.org/dpbtb/ provides the list of dependency relation labels (s-tags) with brief description.
Domain
Unknown (“A set of Bulgarian sentences marked-up with detailed syntactic information. These sentences are mainly extracted from authentic Bulgarian texts. They are chosen with regards two criteria. First, they cover the variety of syntactic structures of Bulgarian. Second, they show the statistical distribution of these phenomena in real texts.”) At least part of it is probably news (Novinar, Sega, Standart).
Size
The CoNLL 2006 version contains 196,151 tokens in 13221 sentences, yielding 14.84 tokens per sentence on average (CoNLL 2006 data split: 190,217 tokens / 12823 sentences training, 5934 tokens / 398 sentences test).
Inside
The original morphosyntactic tags have been converted to fit into the three columns (CPOS, POS and FEAT) of the CoNLL format. There should be a 1-1 mapping between the BTB positional tags and the CoNLL 2006 annotation. Use DZ Interset to inspect the CoNLL tagset.
The morphological analysis does not include lemmas. The morphosyntactic tags have been assigned (probably) manually.
The guidelines for syntactic annotation are documented in the other technical report. The CoNLL distribution contains the BulTreeBankReadMe.html file with a brief description of the syntactic tags (dependency relation labels).
Sample
The first three sentences of the CoNLL 2006 training data:
| 1 | Глава | _ | N | Nc | _ | 0 | ROOT | 0 | ROOT |
| 2 | трета | _ | M | Mo | gen=f|num=s|def=i | 1 | mod | 1 | mod |
| 1 | НАРОДНО | _ | A | An | gen=n|num=s|def=i | 2 | mod | 2 | mod |
| 2 | СЪБРАНИЕ | _ | N | Nc | gen=n|num=s|def=i | 0 | ROOT | 0 | ROOT |
| 1 | Народното | _ | A | An | gen=n|num=s|def=d | 2 | mod | 2 | mod |
| 2 | събрание | _ | N | Nc | gen=n|num=s|def=i | 3 | subj | 3 | subj |
| 3 | осъществява | _ | V | Vpi | trans=t|mood=i|tense=r|pers=3|num=s | 0 | ROOT | 0 | ROOT |
| 4 | законодателната | _ | A | Af | gen=f|num=s|def=d | 5 | mod | 5 | mod |
| 5 | власт | _ | N | Nc | _ | 3 | obj | 3 | obj |
| 6 | и | _ | C | Cp | _ | 3 | conj | 3 | conj |
| 7 | упражнява | _ | V | Vpi | trans=t|mood=i|tense=r|pers=3|num=s | 3 | conjarg | 3 | conjarg |
| 8 | парламентарен | _ | A | Am | gen=m|num=s|def=i | 9 | mod | 9 | mod |
| 9 | контрол | _ | N | Nc | gen=m|num=s|def=i | 7 | obj | 7 | obj |
| 10 | . | _ | Punct | Punct | _ | 3 | punct | 3 | punct |
The first three sentences of the CoNLL 2006 test data:
| 1 | Единственото | _ | A | An | gen=n|num=s|def=d | 2 | mod | 2 | mod |
| 2 | решение | _ | N | Nc | gen=n|num=s|def=i | 0 | ROOT | 0 | ROOT |
| 1 | Ерик | _ | N | Np | gen=m|num=s|def=i | 0 | ROOT | 0 | ROOT |
| 2 | Франк | _ | N | Np | gen=m|num=s|def=i | 1 | mod | 1 | mod |
| 3 | Ръсел | _ | H | Hm | gen=m|num=s|def=i | 2 | mod | 2 | mod |
| 1 | Пълен | _ | A | Am | gen=m|num=s|def=i | 2 | mod | 2 | mod |
| 2 | мрак | _ | N | Nc | gen=m|num=s|def=i | 0 | ROOT | 0 | ROOT |
| 3 | и | _ | C | Cp | _ | 2 | conj | 2 | conj |
| 4 | пълна | _ | A | Af | gen=f|num=s|def=i | 5 | mod | 5 | mod |
| 5 | самота | _ | N | Nc | _ | 2 | conjarg | 2 | conjarg |
| 6 | . | _ | Punct | Punct | _ | 2 | punct | 2 | punct |
Parsing
Nonprojectivities in BTB are rare. Only 747 of the 196,151 tokens in the CoNLL 2006 version are attached nonprojectively (0.38%).
The results of the CoNLL 2006 shared task are available online. They have been published in (Buchholz and Marsi, 2006). The evaluation procedure was non-standard because it excluded punctuation tokens. These are the best results for Bulgarian:
| Parser (Authors) | LAS | UAS |
|---|---|---|
| MST (McDonald et al.) | 87.57 | 92.04 |
| Malt (Nivre et al.) | 87.41 | 91.72 |
| Nara (Yuchang Cheng) | 86.34 | 91.30 |