siimh/estonian_corpus_2021

Estonian National Corpus 2021: Morphologically Tagged and Clean Text

Dataset Summary

This repository contains two versions of the Estonian National Corpus 2021, representing around 43GB of data and millions of sentences annotated with morphological features. This corpus is designed to be useful for:

• Morphological analysis.
• Natural language understanding for Estonian.

Both files in this dataset originate from the Estonian National Corpus (ENC) 2021 and have been processed for different use cases:

1. corpus_et.jsonl: Contains morphologically tagged text where each word is annotated with its base lemma and morphological features (e.g., case, number, tense).
2. corpus_et_clean.jsonl: A cleaned version of the original dataset, with morphological tags removed, leaving only the plain text.

These datasets can be used for fine-tuning language models or studying morphological patterns and syntactic structures in the Estonian language.

---

Files in This Dataset:

• corpus_et.jsonl: This file contains text with morphological annotations, where each word is followed by a tag indicating its grammatical properties (e.g., Vabadus_vabadus-s).

  The fields in this file are as follows:

  • text (string): A sentence where each word is attached to its morphological tag. Example:

    {"text": "Vabadus_vabadus-s millest_mis-p ilmselt_ilmselt-d ei_ei-v."}
    

• corpus_et_clean.jsonl: This file contains the same sentences as corpus_et.jsonl but with the morphological tags stripped. It is clean text suitable for general language fine-tuning, without the added complexity of morph tags.

  The fields in this file are as follows:

  • text (string): A plain-text sentence, with the same meaning as the original tagged version. Example:

    {"text": "Vabadus millest ilmselt ei."}
    

---

Dataset Structure

• Both datasets are in JSONL (newline-delimited JSON) format.
• The datasets do not contain explicit train/validation splits, meaning users can split them according to their needs.
• Each line is a JSON object consisting of the "text" field for the sentence.

---

Use Cases

This dataset is highly versatile and could be used in multiple natural language processing (NLP) tasks, such as:

1. Tagging and Morphological Parsing: Use the tagged version (corpus_et.jsonl) to train models that focus on morphological understanding or performing syntax parsing for Estonian.
2. General Language Modeling: Use the cleaned version (corpus_et_clean.jsonl) to train general-purpose Estonian language models for tasks like text generation or machine translation.
3. Inflection Modeling: The tagged data can also serve as a training set for inflection generation models that learn to correctly inflect Estonian words based on grammatical context.

---

Dataset Statistics

The dataset has the following statistics (for both corpus_et.jsonl and corpus_et_clean.jsonl):

• Total size: ~43GB
• Sentences: Approx. 196 million sentences
• Words: Approx. 2.4 billion words
• Documents: Approx. 11.7 million documents
• Paragraphs: Approx. 64.5 million paragraphs

---

Examples

Example from corpus_et.jsonl (Tagged Text):

{
    "text": "Vabadus_vabadus-s millest_mis-p ilmselt_ilmselt-d ei_ei-v."
}

Example from corpus_et_clean.jsonl (Clean Text):

{
    "text": "Vabadus millest ilmselt ei."
}

---

Dataset Creation

The dataset was derived from the Estonian National Corpus 2021 and processed into these two versions:

1. Tagged JSONL (corpus_et.jsonl): This version contains morphologically annotated text based on the original corpus.
2. Clean JSONL (corpus_et_clean.jsonl): This version contains the same text but without the morphological tags—resulting in clean, plain-text sentences.

---

License

This dataset is made available under the Creative Commons Attribution License (CC-BY), allowing free use and sharing with proper attribution to the authors listed below.

---

Citation

If you use this dataset, please cite the authors of the original Estonian National Corpus 2021:

Koppel, Kristina; Kallas, Jelena (2022). Eesti keele ühendkorpus 2021. DOI: 10.15155/3-00-0000-0000-0000-08E60L

Please also give credit to this dataset repository when used in a project:

@dataset{siimh_estonian_corpus_2021,
  author    = {Siim Haugas},
  title     = {Estonian National Corpus 2021: Tagged and Cleaned Versions},
  year      = {2023},
  publisher = {Hugging Face},
  url       = {https://huggingface.co/datasets/siimh/estonian_corpus_2021}
}

---

Contact

For any inquiries regarding this dataset or data processing, feel free to contact:

• Siim Haugas
• Hugging Face profile: https://huggingface.co/siimh

---

How to Load the Dataset

You can load the dataset directly from Hugging Face with the datasets library.

For the Tagged Version (corpus_et.jsonl):

from datasets import load_dataset

# Load the tagged dataset
dataset = load_dataset("siimh/estonian_corpus_2021", data_files="corpus_et.jsonl")

For the Cleaned Version (corpus_et_clean.jsonl):

from datasets import load_dataset

# Load the clean dataset
dataset = load_dataset("siimh/estonian_corpus_2021", data_files="corpus_et_clean.jsonl")

---

Conclusion

This dataset is a powerful resource for fine-tuning Estonian-language models, improving morphological awareness, and supporting natural language processing tasks. Whether you're training a language model, working on syntactic parsing, or preparing for a Estonian chatbot, this dataset will provide excellent material for various NLP tasks.