home edit page issue tracker
This page pertains to UD version 2.

UD Basque BDT

Language: Basque (code: eu)
Family: Basque

This treebank has been part of Universal Dependencies since the UD v1.1 release.

The following people have contributed to making this treebank part of UD: Maria Jesus Aranzabe, Aitziber Atutxa, Kepa Bengoetxea, Arantza Diaz de Ilarraza, Iakes Goenaga, Koldo Gojenola, Larraitz Uria.

Repository: UD_Basque-BDT
Search this treebank on-line: PML-TQ
Download all treebanks: UD 2.2

License: CC BY-NC-SA 3.0

Genre: news

Questions, comments? General annotation questions (either Basque-specific or cross-linguistic) can be raised in the main UD issue tracker. You can report bugs in this treebank in the treebank-specific issue tracker on Github. If you want to collaborate, please contact [koldo • gojenola (æt) ehu • eus]. Development of the treebank happens outside the UD repository. If there are bugs, either the original data source or the conversion procedure must be fixed. Do not submit pull requests against the UD repository.

Annotation Source
Lemmas assigned by a program, not checked manually
UPOS annotated manually in non-UD style, automatically converted to UD
XPOS annotated manually in non-UD style, automatically converted to UD
Features annotated manually in non-UD style, automatically converted to UD
Relations annotated manually in non-UD style, automatically converted to UD

Description

The Basque UD treebank is based on a automatic conversion from part of the Basque Dependency Treebank (BDT), created at the University of of the Basque Country by the IXA NLP research group. The treebank consists of 8.993 sentences (121.443 tokens) and covers mainly literary and journalistic texts.

The Basque UD treebank is based on a automatic conversion from part of the Basque Dependency Treebank (BDT) (Aduriz et al., 2003), created at the University of of the Basque Country by the IXA NLP research group. The treebank consists of 5274 sentences (60563 tokens) and covers mainly literary and journalistic texts. The Basque language can be described as a morphologically rich, agglutinative language with a high capacity of generating inflected word-forms, with free constituent order of sentence elements. It can be considered a head-final language, as the syntactic head of phrases is located at the end of the last word of the phrase, in the form of a suffix. BDT is a pure dependency treebank from its original design, annotated in the CoNLL-X format, and it shares with UD a lexicalist hypothesis in syntax, where dependencies occur between whole individual wordforms. Under this lexicalist approach, each word shows several morphosyntactic associated features, corresponding to affixes (prefixes and suffixes) attached to the base forms, such as case (there are 14 morphological cases in Basque), number, definiteness or type of subordinate sentence (adversative, conditional, …). These suffixes usually appear as separated wordforms in non agglutinative languages. The last version of BDT contains 150,000 tokens forming 11,225 sentences, with 1.3% of non-projective arcs. BDT encodes 16 different POS and 28 dependencies. Although BDT was in accord with many UD guidelines, the process was not trivial, converting around 80% of the tokens (121.443 tokens). The set of remaining sentences correspond to either special cases not accounted by the conversion rules or other types of less frequent phenomena which have not been dealt with at the moment.

Acknowledgments

The conversion of the original treebank has been performed by Aitziber Atutxa, Iakes Goenaga and Koldo Gojenola at University of the Basque Country (EHU/UPV). In contrast, the conversion of the UD treebank v1.2 to v2.0 has been performed by Dan Zeman. We thank everyone who has collaborate in the transformation of the Basque Dependency Treebank.

Sentences were randomized and divided in 60-20-20 splits for the train, dev and test files, repectively.

Statistics of UD Basque BDT

POS Tags

ADJ – ADP – ADV – AUX – CCONJ – DET – INTJ – NOUN – NUM – PART – PRON – PROPN – PUNCT – SYM – VERB – X

Features

Animacy – Aspect – Case – Definite – Degree – Gender – Gender[dat] – Gender[erg] – Mood – Number – Number[abs] – Number[dat] – Number[erg] – NumType – Person – Person[abs] – Person[dat] – Person[erg] – Polarity – Polite – Polite[abs] – Polite[dat] – Polite[erg] – PronType – VerbForm – Voice

Relations

acl – advcl – advmod – amod – appos – aux – case – cc – ccomp – compound – conj – cop – csubj – dep – det – discourse – fixed – flat – iobj – mark – nmod – nsubj – nummod – obj – obl – parataxis – punct – root – vocative – xcomp

Tokenization and Word Segmentation

Morphology

Tags

Nominal Features

Degree and Polarity

Verbal Features

Pronouns, Determiners, Quantifiers

Other Features

Syntax

Auxiliary Verbs and Copula

Core Arguments, Oblique Arguments and Adjuncts

Here we consider only relations between verbs (parent) and nouns or pronouns (child).

Relations Overview