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polish-dynaword

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Slayer Labs 18

First dataset contribution — review requested 🙏

This is my first dataset PR to polish-dynaword. Please review carefully — happy to adjust
anything (thresholds, schema, naming, provenance wording).

What: european_hplt_v3_pl — filtered Polish subset of HPLT v3.0 (pol_Latn), the two top
Web-Docs-Scorer quality bins (WDS = 10 + 9), 2 shards.

Why: the v0.3 candidate config lists only HPLT v1 (european-hplt-v1, ~1.98B PL tokens).
HPLT v3.0 is a newer, much larger CC0 release (pol_Latn ≈ 270B raw tokens) with improved
extraction (Trafilatura 2.0), global dedup, and WDS quality bins. This contributes the cleaned top
bins; the same pipeline scales to bins 9→5.

How it was made (src/clean_hplt_v3.py, thresholds inherited from src/filter_european_hplt.py):

1. Stream the raw HPLT v3 pol_Latn shards 10_1 + 9_1 (jsonl.zst) from data.hplt-project.org (NOT SpeakLeash).
2. Filter per document: lang=pol_Latn & prob≥0.80, MT-prob<0.20, register ∈ {ID,OP,HI,IN,NA},
   ≥400 chars & ≥80 words, drop boilerplate/adult/legalish (anti-legalese goal), length cap 120k chars
   (removes book-length copyright/OCR risk), mojibake drop (upstream HPLT UTF-8→GBK mis-decode, e.g. ż→偶),
   exclude wikipedia/wikisource/wikimedia + file-host domains, per-domain cap 250.
3. Emit canonical schema (id/text/source/added/created/token_count/license/author), token_count via tiktoken cl100k.
4. src/test_hplt_v3_contract.py passes (schema + open license + non-empty text + token>0 + stats consistency);
   mojibake residual 0.

Quality (surface metrics vs accepted sources): MT-prob kept ~0.08, boilerplate ~0.2%, diacritic-ratio ~0.066,
TTR@500 ~0.64 (within accepted range, ≈ parliamentary); bin-9 ≈ bin-10 on every metric.

Honest caveats (please weigh in review):

• Web-crawl → accept_after_web_review, not release-clean. CC0 is on the packaging; underlying web text
  may include in-copyright material that recurs at all lengths — the length cap only removes obvious books.
• Near-dup NOT removed (per Dynaword "heavy filtering downstream"): ~11.8% 8-gram overlap with plwiki measured;
  wikipedia/wikisource domains excluded to mitigate, but cross-source containment dedup vs the full corpus is left downstream.
• src/sources.py entry added so the release build recognizes the source and lifts the CC0 license from the registry.