PiotrSty/cswiki-articles-czech

Czech Wikipedia articles (cswiki_articles) - content namespace

Encyclopedic Czech articles (Wikipedie, namespace 0, non-redirect) from the pinned cswiki pages-meta-current dump (2026-10-01), latest revision per page, wikitext stripped to plain text.

• Source pages: 599,166 retained from 1,666,311 dump pages (all namespaces)
• Retained records: 499,957 (83.4% of content pages)
• Measured cl100k_base proxy tokens: 729,882,310
• Characters: 1,643,148,657
• Time span (revision dates): 2010-02-07 - 2026-10-01
• Source snapshot: cswiki-latest-pages-meta-current.xml.bz2 (1,573,219,770 bytes, md5 00f9ba6f76edac1f2546487440287c28 - verified against publisher md5sums; dumps index https://dumps.wikimedia.org/cswiki/latest/)

License - evidence at the origin

• Wiki-layer license: CC BY-SA 4.0 - verbatim siteinfo rightsinfo: "Creative Commons Attribution-Share Alike 4.0" (https://cs.wikipedia.org/w/api.php?action=query&meta=siteinfo&siprop=rightsinfo, checked 2026-10-07). Per-record license field: CC-BY-SA-4.0.
• Individual pages may quote non-free works under the project's fair-use doctrine - review item. release: None until the review ruling (same policy as legal-sk and justicecorp-sk).
• Per-record provenance in artifacts/attribution.jsonl.gz: page id, title, source URL (https://cs.wikipedia.org/wiki/<title>), revision date and text_sha256.

Samples

Verbatim records from artifacts/sample.jsonl, truncated with [...].

Sample 1

id: cswiki_articles_118995
source: cswiki_articles
created: 2025-10-08
token_count: 4461

Obec Ptice se nachází v okrese Praha-západ, kraj Středočeský, asi 22 km západně od centra Prahy a 5 km severozápadně od Rudné. Žije zde obyvatel.
Jméno obce je odvozeno od chorvatského „ptica“ nebo slovinského „ptič“, co [...]

Sample 2

id: cswiki_articles_892287
source: cswiki_articles
created: 2023-07-04
token_count: 320

Houtribdijk (též pod názvy Markerwaarddijk, Markermeerdijk či Dijk Enkhuizen-Lelystad) je hráz v Nizozemsku, která od sebe odděluje vody jezer IJsselmeer a Markermeer a je dlouhá 28 km. Její výstavba začala roku 1963, do [...]

Sample 3

id: cswiki_articles_754793
source: cswiki_articles
created: 2017-04-18
token_count: 242

Mútnik je osada na území města Liptovský Mikuláš. Leží v severní části města na katastrálním území Liptovská Ondrašová.
Rozkládá se severně od místní železniční stanice, na úpatí vrchu Červienec, u silnice III/018128 l [...]

Filtering

From the pages-meta-current dump: namespace 0 only, redirect pages skipped (<redirect/> element), latest revision per page. Wikitext stripped with mwparserfromhell (strip_code(normalize, collapse)) after raw-level removal of galleries, file/image links (Soubor:/File:/Image:/Media:), interwiki links and category lines (Kategorie:).

Rejections (99,209 records, one final decision per record in artifacts/decisions.jsonl.gz):

{
  "low_letter_ratio": 3663,
  "near_duplicate": 9,
  "non_czech_text": 4024,
  "normalized_duplicate": 1,
  "too_little_text": 85174,
  "too_little_text_after_redaction": 6338
}

too_little_text dominates: the dump contains a long tail of stubs and template-only pages that strip to under 500 characters.

PII redaction (redact_pii() in the builder): labelled patterns only - e-mail, labelled phone, labelled IP address ("IP adresa"), labelled national identifier ("rodné číslo"), CZ IBAN candidates. Pattern counts: 262 e-mail, 4,798 labelled phone, 25 labelled IPv4, 1 national identifier, 1 CZ IBAN, 0 IPv6. Residual pattern documents after redaction: 1 (labelled_phone) - the only non-zero residual in this corpus line; flagged as a review item (pattern-boundary edge case, 1 document in 499,957). Bare dotted quads are content and are deliberately not redacted.

Layout filter (drop_layout_lines()): bullet-only lines, page fractions and Strana n footers (255,799 line instances removed). Boilerplate: lines with document frequency above 5,063 (1% of gated documents) dropped (1,888,157 line instances removed; max bin df 408,943 - navigation and infobox residue).

Deduplication: exact dedup on 128-bit truncated sha256 of final text; near dedup with Jaccard >= 0.90 on capped 25 x 5-word shingle sets (candidate pairs via first-owner-per-shingle majority vote, >= 20 shared shingles; representative = first occurrence in shard order). Records sharing a source id are rejected as duplicate_id (first occurrence wins).

Known limitations

• Encyclopedic register; article text may include quoted third-party material and non-free quotes (review item).
• Wikitext stripping leaves occasional layout fragments and template residue in a small share of records.
• One document retains a labelled-phone-like pattern after redaction (review item, see Filtering).
• Boilerplate detection is hash-binned (rare bin collisions may over-drop by a negligible amount).
• created is the latest revision date of the source page.

See artifacts/ for attribution, per-record decisions, QA counts, samples and checksums. verify() passes: 499,957 rows, unique IDs, token counts recomputed and text_sha256 re-checked against the emitted text. Tests: 9 (pytest).