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ECHR-OD: On building an integrated open repository of legal documents for machine learning applications


[ 1 ] Instytut Informatyki, Wydział Informatyki i Telekomunikacji, Politechnika Poznańska | [ P ] employee

Scientific discipline (Law 2.0)

[2.3] Information and communication technology

Year of publication


Published in

Information Systems

Journal year: 2022 | Journal volume: vol. 106

Article type

scientific article

Publication language


  • Open data repository
  • Legal documents repository
  • Judgment documents
  • European Court of Human Rights
  • Machine learning
  • Classification of legal documents

EN This paper presents an exhaustive and unified repository of judgments documents, called ECHR-OD, based on the European Court of Human Rights. The need of such a repository is explained through the prism of the researcher, the data scientist, the citizen, and the legal practitioner. Contrarily to many open data repositories, the full creation process of ECHR-OD, from the collection of raw data to the feature transformation, is provided by means of a collection of fully automated and open-source scripts. It ensures reproducibility and a high level of confidence in the processed data, which is one of the most important issues in data governance nowadays. The experimental evaluation was performed to study the problem of predicting the outcome of a case, and to establish baseline results of popular machine learning algorithms. The obtained results are consistently good across the binary datasets with an accuracy comprised between 75.86% and 98.32%, having the average accuracy equals to 96.45%, which is 14pp higher than the best known result with similar methods. We achieved a F1-Score of 82% which is aligned with the recent result using BERT. We show that in a multilabel setting, the features available prior to a judgment are good predictors of the outcome, opening the road to practical applications.

Date of online publication


Pages (from - to)

101822-1 - 101822-20





Article Number: 101822

Points of MNiSW / journal


Impact Factor

2.309 [List 2020]

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