UA-GEC: Grammatical Error Correction and Fluency Corpus for the Ukrainian language

gec, ukrainian, dataset, corpus, grammatical, error, correction, grammarly, corpus-data, corpus-tools, grammatical-error-correction, natural-language-processing, nlp-datasets, ukrainian-language
pip install ua-gec==1.2.1


UA-GEC: Grammatical Error Correction and Fluency Corpus for the Ukrainian Language

This repository contains UA-GEC data and an accompanying Python library.


All corpus data and metadata stay under the ./data. It has two subfolders for train and test splits

Each split (train and test) has further subfolders for different data representations:

./data/{train,test}/annotated stores documents in the annotated format

./data/{train,test}/source and ./data/{train,test}/target store the original and the corrected versions of documents. Text files in these directories are plain text with no annotation markup. These files were produced from the annotated data and are, in some way, redundant. We keep them because this format is convenient in some use cases.


./data/metadata.csv stores per-document metadata. It's a CSV file with the following fields:

  • id (str): document identifier.
  • author_id (str): document author identifier.
  • is_native (int): 1 if the author is native-speaker, 0 otherwise
  • region (str): the author's region of birth. A special value "Інше" is used both for authors who were born outside Ukraine and authors who preferred not to specify their region.
  • gender (str): could be "Жіноча" (female), "Чоловіча" (male), or "Інша" (other).
  • occupation (str): one of "Технічна", "Гуманітарна", "Природнича", "Інша"
  • submission_type (str): one of "essay", "translation", or "text_donation"
  • source_language (str): for submissions of the "translation" type, this field indicates the source language of the translated text. Possible values are "de", "en", "fr", "ru", and "pl".
  • annotator_id (int): ID of the annotator who corrected the document.
  • partition (str): one of "test" or "train"
  • is_sensitive (int): 1 if the document contains profanity or offensive language

Annotation format

Annotated files are text files that use the following in-text annotation format: {error=>edit:::error_type=Tag}, where error and edit stand for the text item before and after correction respectively, and Tag denotes an error category (Grammar, Spelling, Punctuation, or Fluency).

Example of an annotated sentence:

    I {likes=>like:::error_type=Grammar} turtles.

An accompanying Python package, ua_gec, provides many tools for working with annotated texts. See its documentation for details.

Train-test split

We expect users of the corpus to train and tune their models on the train split only. Feel free to further split it into train-dev (or use cross-validation).

Please use the test split only for reporting scores of your final model. In particular, never optimize on the test set. Do not tune hyperparameters on it. Do not use it for model selection in any way.

Next section lists the per-split statistics.


UA-GEC contains:

Split Documents Sentences Tokens Authors
train 851 18,225 285,247 416
test 160 2,490 43,432 76
TOTAL 1,011 20,715 328,779 492

See stats.txt for detailed statistics generated by the following command (ua-gec must be installed first):

$ make stats

Python library

Alternatively to operating on data files directly, you may use a Python package called ua_gec. This package includes the data and has classes to iterate over documents, read metadata, work with annotations, etc.

Getting started

The package can be easily installed by pip:

    $ pip install ua_gec==1.1

Alternatively, you can install it from the source code:

    $ cd python
    $ python develop

Iterating through corpus

Once installed, you may get annotated documents from the Python code:

    >>> from ua_gec import Corpus
    >>> corpus = Corpus(partition="train")
    >>> for doc in corpus:
    ...     print(doc.source)         # "I likes it."
    ...     print(         # "I like it."
    ...     print(doc.annotated)      # <AnnotatedText("I {likes=>like} it.")
    ...     print(doc.meta.region)    # "Київська"

Note that the doc.annotated property is of type AnnotatedText. This class is described in the next section

Working with annotations

ua_gec.AnnotatedText is a class that provides tools for processing annotated texts. It can iterate over annotations, get annotation error type, remove some of the annotations, and more.

While we're working on a detailed documentation, here is an example to get you started. It will remove all Fluency annotations from a text:

    >>> from ua_gec import AnnotatedText
    >>> text = AnnotatedText("I {likes=>like:::error_type=Grammar} it.")
    >>> for ann in text.iter_annotations():
    ...     print(ann.source_text)       # likes
    ...     print(ann.top_suggestion)    # like
    ...     print(ann.meta)              # {'error_type': 'Grammar'}
    ...     if ann.meta["error_type"] == "Fluency":
    ...         text.remove(ann)         # or `text.apply(ann)`


  • The data collection is an ongoing activity. You can always contribute your Ukrainian writings or complete one of the writing tasks at

  • Code improvements and document are welcomed. Please submit a pull request.


The accompanying paper is:

      title={UA-GEC: Grammatical Error Correction and Fluency Corpus for the Ukrainian Language},
      author={Oleksiy Syvokon and Olena Nahorna},