Universal Dependencies - English Dependency Treebank Universal Dependencies English Web Treebank v2.5 -- 2019-11-15 https://github.com/UniversalDependencies/UD_English-EWT

Summary

A Gold Standard Universal Dependencies Corpus for English, built over the source material of the English Web Treebank LDC2012T13 (https://catalog.ldc.upenn.edu/LDC2012T13).

Introduction

The corpus comprises 254,830 words and 16,622 sentences, taken from five genres of web media: weblogs, newsgroups, emails, reviews, and Yahoo! answers. See the LDC2012T13 documentation for more details on the sources of the sentences. The trees were automatically converted into Stanford Dependencies and then hand-corrected to Universal Dependencies. All the basic dependency annotations have been single-annotated, a limited portion of them have been double-annotated, and subsequent correction has been done to improve consistency. Other aspects of the treebank, such as Universal POS, features and enhanced dependencies, has mainly been done automatically, with very limited hand-correction.

License/Copyright

The annotations and database rights of the Universal Dependencies English Web Treebank are licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

You should have received a copy of the license along with this work. If not, see http://creativecommons.org/licenses/by-sa/4.0/.

The underlying texts come from various sources collected for the LDC English Web Treebank. Some parts are in the public domain. Portions may be © 2012 Google Inc., © 2011 Yahoo! Inc., © 2012 Trustees of the University of Pennsylvania and/or © other original authors.

Structure

This directory contains a corpus of sentences annotated using Universal Dependencies annotation. The corpus comprises 254,830 words and 16,622 sentences, taken from various web media including weblogs, newsgroups, emails, reviews, and Yahoo! answers; see the LDC2012T13 documentation for more details on the source of the sentences. The trees were automatically converted into Stanford Dependencies and then hand-corrected to Universal Dependencies. All the dependency annotations have been single-annotated, and a limited portion of them have been double-annotated with interannotator agreement at approximately 96%. The sentence IDs include the genre and the filename of the original LDC2012T13 filename.

This corpus is compatible with the CoNLL-U format defined for Universal Dependencies. See:

http://universaldependencies.github.io/docs/format.html

The dependency taxonomy can be found on the Universal Dependencies web site:

http://www.universaldependencies.org

For the conversion to v2, we performed an automatic conversion with extensive spot-checking, and manual adjudication of ambiguous cases.

The enhanced dependencies were automatically obtained by running an adapted version of the converter by Schuster and Manning (2016). These dependencies have not been manually checked.

Deviations from UD

Version 2.5 of the English UD treebank conforms to the UD guidelines in almost all respects, but there remain the following deviations:

The UD dependency flat is largely only used for person names.
Dates are not annotated consistently.
The attachment of punctuation tokens is sometimes not according to the guidelines.
Some of the UD dependency goeswith goes from right-to-left instead of from left-to-right.

Changelog

2019-05-15 v2.5

Fixed some wrong lemmata and POS tags
Fixed miscellaneous syntactic issues
Fixed CoNLL-U syntax error

2019-05-15 v2.4

Fixed some wrong lemmata and POS tags
Fixed miscellaneous syntactic issues
Fixed some punctuation attachments
Fixed malformed enhanced graphs

2018-11-15 v2.3

Fixed several lemmata

2018-04-15 v2.2

Repository renamed from UD_English to UD_English-EWT
Automatically added enhanced dependencies (These have not been manually checked!)
Fixed some wrong lemmata and POS tags
Fixed miscellaneous syntactic issues

2017-11-15 v2.1

Fixed some wrong lemmata, POS tags
Fixed miscellaneous syntactic issues
Added basic dependencies into the DEPS column according to the CONLL-U v2 format

2017-02-15 v2.0

Updated treebank to conform to v2 guidelines
Fixed some wrong lemmata
Fixed miscellaneous syntactic issues
Added empty nodes for gapped constructions in enhanced representation

2016-11-15 v1.4

Changed POS tag of fused det-noun pronouns (e.g., "somebody", "nothing") to PRON
Added original, untokenized sentences to CoNLL-U files
Fixed some POS errors, features and wrong lemmata
Fixed miscellaneous syntactic issues in a few sentences

2016-05-15 v1.3

Improved mapping of WDT to UPOS
Corrected lemma of "n't" to "not"
Fixed some errors between advcl, ccomp and parataxis
Fixed inconsistent analyses of sentences repeated between dev and train sets
Fixed miscellaneous syntactic issues in a few sentences

2015-11-15 v1.2

Bugfix: removed _NFP suffix from some lemmas
Fixed date annotations to adopt UD standard
Remove escaping of ( and ) from word tokens (XPOSTAGs are still -LRB- and -RRB-)
Improved precision of xcomp relation
Improved recall of name relation
Corrected lemmas for reduced auxiliaries
Corrected UPOS tags of pronominal uses of this/that/these/those (from DET to PRON)
Corrected UPOS tags of subordinating conjunctions (from ADP to SCONJ)
Corrected UPOS tags of some main verbs (from AUX to VERB)

Contributing

To help improve the corpus, please alert us to any errors you find in it. The best way to do this is to file a github issue at:

https://github.com/UniversalDependencies/UD_English-EWT/issues

We also welcome pull requests. If you want to make edits, please modify the trees in the idividual files in the not-to-release/sources directory instead of making direct changes to en_ewt-ud-{dev,test,train}.conllu.

Acknowledgments

Annotation of the Universal Dependencies English Web Treebank was carried out by (in order of size of contribution):

Natalia Silveira
Timothy Dozat
Sebastian Schuster
Miriam Connor
Marie-Catherine de Marneffe
Nathan Schneider
Samuel Bowman
Hanzhi Zhu
Daniel Galbraith
Christopher Manning
John Bauer

Creation of the CoNLL-U files, including calculating UPOS, feature, and lemma information was primarily done by

Sebastian Schuster
Natalia Silveira

The construction of the Universal Dependencies English Web Treebank was partially funded by a gift from Google, Inc., which we gratefully acknowledge.

Citations

You are encouraged to cite this paper if you use the Universal Dependencies English Web Treebank:

@inproceedings{silveira14gold,
  year = {2014},
  author = {Natalia Silveira and Timothy Dozat and Marie-Catherine de
      Marneffe and Samuel Bowman and Miriam Connor and John Bauer and
      Christopher D. Manning},
  title = {A Gold Standard Dependency Corpus for {E}nglish},
  booktitle = {Proceedings of the Ninth International Conference on Language
    Resources and Evaluation (LREC-2014)}
}

Metadata

=== Machine-readable metadata (DO NOT REMOVE!) ================================
Data available since: UD v1.0
License: CC BY-SA 4.0
Includes text: yes
Genre: blog social reviews email
Lemmas: automatic with corrections
UPOS: converted with corrections
XPOS: manual native
Features: automatic
Relations: manual native
Contributors: Silveira, Natalia; Dozat, Timothy; Manning, Christopher; Schuster, Sebastian; Bauer, John; Connor, Miriam; de Marneffe, Marie-Catherine; Schneider, Nathan; Bowman, Sam; Zhu, Hanzhi; Galbraith, Daniel
Contributing: here source
Contact: syntacticdependencies@lists.stanford.edu
===============================================================================