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metadata 
license: odc-by
language:
  - en
size_categories:
  - 10B<n<100B

FineWeb-Nano

Dataset Description

FineWeb-Nano is a highly curated, premium subset extracted from nampdn-ai/mini-fineweb.

How "The Best" Was Determined

This dataset was created programmatically by streaming the original dataset and sorting chunks based on a rigorous quality scoring algorithm. The heuristic heavily favors:

  1. High language_score (if provided by the upstream extraction).
  2. Optimal document length (penalizing abnormally short snippets and excessively long, unformatted dumps).
  3. Strong structural coherence suitable for pre-training Small Language Models (SLMs) and LLMs.

FineWeb-Nano represents the elite tier of data. It takes the BEST 29.8 Gigabytes directly from the top percentiles of the Fineweb-Tiny subset. This is the ultimate, hyper-distilled dataset for rapid model experimentation.

License

This dataset is released under the Open Data Commons Attribution License (ODC-By) v1.0 to perfectly match the upstream Fineweb mini licensing constraints.