| # Summary | |
| The Czech-PDT UD treebank is based on the Prague Dependency Treebank 3.0 (PDT), | |
| created at the Charles University in Prague. | |
| # Introduction | |
| The treebank consists of 87,913 sentences (1.5 M tokens) and its domain is | |
| mainly newswire, reaching also to business and popular scientific articles | |
| from the 1990s. The treebank is licensed under the terms of | |
| [CC BY-NC-SA 3.0](http://creativecommons.org/licenses/by-nc-sa/3.0/) | |
| and its original (non-UD) version can be downloaded from | |
| [http://hdl.handle.net/11858/00-097C-0000-0023-1AAF-3](http://hdl.handle.net/11858/00-097C-0000-0023-1AAF-3). | |
| The morphological and syntactic annotation of the Czech UD treebank is created | |
| through a conversion of PDT data. The conversion procedure has been designed by | |
| Dan Zeman and implemented in Treex. | |
| # Acknowledgments | |
| We wish to thank all of the contributors to the original PDT annotation effort, | |
| including Eduard Bejček, Eva Hajičová, Jan Hajič, Pavlína Jínová, | |
| Václava Kettnerová, Veronika Kolářová, Marie Mikulová, Jiří Mírovský, | |
| Anna Nedoluzhko, Jarmila Panevová, Lucie Poláková, Magda Ševčíková, | |
| Jan Štěpánek, and Šárka Zikánová. | |
| ## References | |
| * Eduard Bejček, Eva Hajičová, Jan Hajič, Pavlína Jínová, Václava Kettnerová, | |
| Veronika Kolářová, Marie Mikulová, Jiří Mírovský, Anna Nedoluzhko, | |
| Jarmila Panevová, Lucie Poláková, Magda Ševčíková, Jan Štěpánek, | |
| and Šárka Zikánová. 2013. Prague Dependency Treebank 3.0, | |
| LINDAT/CLARIN digital library at Institute of Formal and Applied Linguistics, | |
| Charles University in Prague, | |
| http://hdl.handle.net/11858/00-097C-0000-0023-1AAF-3. | |
| * Eduard Bejček, Jarmila Panevová, Jan Popelka, Pavel Straňák, Magda Ševčíková, | |
| Jan Štěpánek, and Zdeněk Žabokrtský. 2012. Prague Dependency Treebank 2.5 – | |
| a revisited version of PDT 2.0. | |
| In: Proceedings of the 24th International Conference on Computational | |
| Linguistics (Coling 2012), Mumbai, India, pp. 231-246. | |
| http://www.aclweb.org/anthology/C/C12/C12-1015.pdf | |
| # Domains and Data Split | |
| NOTE: Earlier releases of the treebank had four training data files. This was | |
| due to Github restrictions on file size. We have now re-joined the training | |
| files in the official release package (beginning with UD v1.3), so there is | |
| just one training file as in all other languages, and it is named | |
| cs-ud-train.conllu. The four files in previous releases corresponded to the | |
| four sources of the original texts; the sources may still be distinguished, | |
| if desirable, by the prefixes of sentence ids. All of them are newspapers, but | |
| * l (ln) and m (mf) are mainstream daily papers (news, commentaries, but also | |
| sports results and TV programs) | |
| * c (cmpr) is a business weekly | |
| * v (vesm) contains popular scientific articles (the hardest to parse: long | |
| sentences and unusual vocabulary) | |
| The dev and test sets contain all four sources and their size is proportional | |
| to the sizes of the respective training parts. | |
| ## Source of annotations | |
| This table summarizes the origins and checking of the various columns of the CoNLL-U data. | |
| | Column | Status | | |
| | ------ | ------ | | |
| | ID | Sentence segmentation and (surface) tokenization was automatically done and then hand-corrected; see [PDT documentation](http://ufal.mff.cuni.cz/pdt2.0/doc/pdt-guide/en/html/ch02.html). Splitting of fused tokens into syntactic words was done automatically during PDT-to-UD conversion. | | |
| | FORM | Identical to Prague Dependency Treebank 3.0 form. | | |
| | LEMMA | Manual selection from possibilities provided by morphological analysis: two annotators and then an arbiter. PDT-to-UD conversion stripped from lemmas the ID numbers distinguishing homonyms, semantic tags and comments; this information is preserved as attributes in the MISC column. | | |
| | UPOSTAG | Converted automatically from XPOSTAG (via [Interset](https://ufal.mff.cuni.cz/interset)), from the semantic tags in PDT lemma, and occasionally from other information available in the treebank; human checking of patterns revealed by automatic consistency tests. | | |
| | XPOSTAG | Manual selection from possibilities provided by morphological analysis: two annotators and then an arbiter. | | |
| | FEATS | Converted automatically from XPOSTAG (via Interset), from the semantic tags in PDT lemma, and occasionally from other information available in the treebank; human checking of patterns revealed by automatic consistency tests. | | |
| | HEAD | Original PDT annotation is manual, done by two independent annotators and then an arbiter. Automatic conversion to UD; human checking of patterns revealed by automatic consistency tests. | | |
| | DEPREL | Original PDT annotation is manual, done by two independent annotators and then an arbiter. Automatic conversion to UD; human checking of patterns revealed by automatic consistency tests. | | |
| | DEPS | — (currently unused) | | |
| | MISC | Information about token spacing taken from PDT annotation. Lemma / word sense IDs, semantic tags and comments on meaning moved here from the PDT lemma. | | |
| # Changelog | |
| * 2020-05-15 v2.6 | |
| * Genitive, dative and instrumental nominals are now considered oblique. | |
| * Added enhanced relations with case information. | |
| * Added enhanced relations around relative clauses. | |
| * Added enhanced external subjects in control verb constructions. | |
| * Added empty nodes to enhanced graphs (but orphans are just converted to dep). | |
| * 2019-05-15 v2.4 | |
| * Modified conversion: nouns do not have objects. | |
| * Fixed punctuation attachment. | |
| * Fixed "a to", "to jest" and other expressions. | |
| * 2018-11-15 v2.3 | |
| * Bug fix: conditional "by" should be attached as 'aux', not 'aux:pass'. | |
| * Flat name structures extended to titles and occupations. | |
| * Added LDeriv for passive participles (the infinitive of the source verb). | |
| * 2018-04-15 v2.2 | |
| * Repository renamed from UD_Czech to UD_Czech-PDT. | |
| * Added enhanced representation of dependencies propagated across coordination. | |
| The distinction of shared and private dependents is derived deterministically from the original Prague annotation. | |
| * Fixed computation of the LDeriv MISC attribute. | |
| * 2017-11-15 v2.1 | |
| * Retagged pronouns “každý” and “kterýžto”. | |
| * Prepositional objects are now “obl:arg” instead of “obj”. | |
| * Instrumental phrases for demoted agents in passives are now “obl:agent”. | |
| * 2017-03-01 v2.0 | |
| * Converted to UD v2 guidelines. | |
| * Reconsidered PRON vs. DET. Extended PronType and Poss. | |
| * Improved advmod vs. obl distinction. | |
| * L-participles are verbs, other participles are adjectives. | |
| * Removed style flags from lemmas. | |
| * 2016-05-15 v1.3 | |
| * Fixed adverbs that were attached as nmod; correct: advmod. | |
| * Copulas with clausal complements are now heads. | |
| * Improved conversion of AuxY. | |
| * Relation of foreign prepositions changed to foreign. | |
| * 2015-11-15 v1.2 | |
| * Conversion procedure rewritten again (may result in minor differences in | |
| borderline cases) | |
| * Only one “root” relation per tree now enforced; some bugs around root fixed | |
| * The “name” relation goes now always left-to-right (in UD 1.1 it was family- | |
| to-given name) | |
| * Fixed bug with numeral-noun swapping that destroyed coordinations of | |
| numbers and caused the “conj” relation to go right-to-left | |
| * Fixed minor bugs around subordinating conjunctions | |
| * Changed dependency relation of reflexive pronouns attached to inherently | |
| reflexive verbs from compound:reflex to expl | |
| * Applied heuristics to distinguish at least some iobj from dobj | |
| * Fixed bugs around xcomp (future infinitives and subjects attached to | |
| controlled verbs) | |
| * 2015-05-15 v1.1 | |
| * Conversion procedure completely rewritten | |
| * Improved heuristics to distinguish DET and PRON | |
| * Improved treatment of comparative complements (conjunctions “než” and “jako”) | |
| * Remaining lemma extensions moved from LEMMA to MISC | |
| <pre> | |
| === Machine-readable metadata (DO NOT REMOVE!) ================================ | |
| Data available since: UD v1.0 | |
| License: CC BY-NC-SA 3.0 | |
| Includes text: yes | |
| Genre: news reviews nonfiction | |
| Lemmas: converted from manual | |
| UPOS: converted from manual | |
| XPOS: manual native | |
| Features: converted from manual | |
| Relations: converted from manual | |
| Contributors: Zeman, Daniel; Hajič, Jan | |
| Contributing: elsewhere | |
| Contact: zeman@ufal.mff.cuni.cz | |
| =============================================================================== | |
| </pre> | |