Hynek Kydlíček
ML engineer at Hugging Face; second author of the FineWeb and FineWeb2 dataset papers
- ML Engineer, Hugging Face1
Hynek Kydlíček is a machine learning engineer at Hugging Face. Kydlíček is the second author of the FineWeb datasets paper (2024) and the FineWeb2 paper (2025), both first-authored by Guilherme Penedo, and a co-author of the FineTranslations dataset and of the SmolLM2 paper (2025).12354
Research
Kydlíček's early work includes a 2023 dataset and baselines for classifying Czech news texts and contributions to the BenCzechMark benchmark (2024). At Hugging Face Kydlíček co-authored the FineWeb (2024) and FineWeb2 (2025) dataset papers as second author.67231
Kydlíček is also a co-author of the SmolLM2 paper (2025), of the FineTranslations dataset (2026) and of a 2026 study on synthesizing pretraining data.458
Work
FineWebOpen data
Second author of "The FineWeb Datasets: Decanting the Web for the Finest Text Data at Scale" (2024), the paper describing the FineWeb dataset.2
FineWeb2 (external site: arxiv.org)Open data
Second author of the FineWeb2 paper (2025), which adapts pretraining data processing to many languages.3
Career timeline
Jul 2023
Posted a dataset and baselines for classifying Czech news texts as first author.6
Jun 2024
Co-authored the FineWeb datasets paper as second author.2
Feb 2025
Co-authored the SmolLM2 paper.4
Jun 2025
Co-authored the FineWeb2 paper as second author.3
Apr 2026
Co-authored a systematic study of prompt design for synthesizing pretraining data.8
Related people
More sourced profiles at the same organization, in the same field, or from the same school.
- Abubakar AbidAlso at Hugging Face
- Adina WilliamsLanguage models
- Adrien GallouëtAlso at Hugging Face
- Albert JiangLanguage models
- Anton LozhkovAlso at Hugging Face
- Alexander WettigLanguage models
- Clément DelangueAlso at Hugging Face
- Ali GhodsiDatasets and data
- Colin RaffelAlso at Hugging Face
- Andriy MulyarLanguage models
- Daniel BeveniusAlso at Hugging Face
- Aran KomatsuzakiLanguage models
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