---
dataset_info:
  - config_name: ces_Latn
    features:
      - name: text
        dtype: string
      - name: id
        dtype: string
      - name: url
        dtype: string
      - name: dump
        dtype: string
      - name: date
        dtype: string
      - name: language
        dtype: string
      - name: language_score
        dtype: float64
license: odc-by
task_categories:
  - text-generation
language:
  - ces
tags:
  - fineweb
  - autocurate
  - autoresearch
---

# fineweb-2-autocurate

Autonomously curated subsets of [HuggingFaceFW/fineweb-2](https://huggingface.co/datasets/HuggingFaceFW/fineweb-2).

An AI agent (Qwen3.5-35B-A3B) iteratively analyzed random samples of web documents,
identified quality problems, and proposed heuristic fixes (regex, string operations).
Each fix was validated by training a small language model and measuring BPB improvement
on a Wikipedia eval set. Only fixes that improved BPB were kept.

## Subsets

| Language | Original docs | Kept docs | Kept % |
|---|---|---|---|
| ces_Latn | 66,067,904 | 32,493,428 | 49.2% |
| nob_Latn | 38,144,343 | 30,561,546 | 80.1% |
| nld_Latn | 147,301,270 | 126,021,987 | 85.6% |
| swe_Latn | 59,485,306 | 53,887,025 | 90.6% |
| fin_Latn | 36,710,816 | 33,010,774 | 89.9% |
| pol_Latn | 151,966,724 | 100,254,080 | 66.0% |
| tur_Latn | 95,129,129 | 83,878,413 | 88.2% |