VnDT: A Vietnamese dependency treebank

VnDT is a Vietnamese dependency treebank, consisting of 10K+ sentences. The construction of VnDT is detailed in our following paper:

@InProceedings{Nguyen2014NLDB,
  author = {Nguyen, Dat Quoc  and  Nguyen, Dai Quoc  and  Pham, Son Bao and Nguyen, Phuong-Thai and Nguyen, Minh Le},
  title = {{From Treebank Conversion to Automatic Dependency Parsing for Vietnamese}},
  booktitle = {{Proceedings of 19th International Conference on Application of Natural Language to Information Systems}},
  year = {2014},
  pages = {196-207}
}

By downloading the VnDT treebank, USER agrees:

• to use VnDT for research or educational purposes only.
• to not distribute VnDT or part of VnDT in any original or modified form.
• and to cite our paper whenever VnDT is used to help produce published results.

Data split

With gold-standard POS tags

The VnDT treebank with gold-standard POS tags is split as follows:

• VnDTv1.1-gold-POS-tags-train.conll: 8977 sentences
• VnDTv1.1-gold-POS-tags-dev.conll: 200 sentences
• VnDTv1.1-gold-POS-tags-test.conll: 1020 sentences

These gold-standard POS tags are defined and extracted from the corresponding Vietnamese constituent treebank.

With predicted POS tags

The VnDT treebank with automatically predicted POS tags is split as follows:

• VnDTv1.1-predicted-POS-tags-train.conll: 8977 sentences
• VnDTv1.1-predicted-POS-tags-dev.conll: 200 sentences
• VnDTv1.1-predicted-POS-tags-test.conll: 1020 sentences

The automatically predicted POS tags are resulted from handling a data leakage issue as detailed in the following paper:

@inproceedings{phonlp,
title     = {{PhoNLP: A joint multi-task learning model for Vietnamese part-of-speech tagging, named entity recognition and dependency parsing}},
author    = {Linh The Nguyen and Dat Quoc Nguyen},
booktitle = {Proceedings of the 2021 Conference of the North American Chapter of the Association for Computational Linguistics: Demonstrations},
year      = {2021}
}

Please additionally cite this paper whenever the VnDT variant with automatically predicted POS tags is used to help produce published results.

Versions:

• 04/2014: Released VnDT version 1.0 (VnDTv1.0).
• 12/2018: Released VnDT version 1.1 (VnDTv1.1), fixing several conversion errors that are caused by annotation inconsistencies in the Vietnamese constituent treebank.