UD_Basque-BDT

Treebank card from UD release 2.18: metadata and texts come from UD_Basque-BDT/README.md; size is counted by streaming the .conllu files and checked against the release stats.xml. Generated by tools/treebanks build; do not edit by hand. Papers: Papers: UD_Basque-BDT; seeds: seeds/; converter: convert.md.

Annotation layers

UD scale: manual native — annotated by hand directly in UD; converted from manual — converted from manual annotation in another scheme; converted with corrections — converted and partly corrected by hand; automatic with corrections — automatic, with partial manual corrections; automatic — automatic; not available — the layer is absent.

Size

Tokens are surface tokens (Spanish vámonos is one), words are syntactic words (vamos + nos); multiword tokens are those split into several words; empty nodes are the N.M nodes of the enhanced graph.

Summary

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.

Introduction

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.

This page in Markdown → https://md.mova.elamur.ai/free/en/docs/treebanks/eu/bdt/