Add CC0 Polish Common Voice validated text (v26.0)

Scope

This contribution adds a text-only projection of Polish sentences associated
with validated recordings in Mozilla Common Voice Scripted Speech 26.0. It does
not include audio, contributor identifiers, demographic fields or file paths.

Data

• Source rows inspected: 138,798 validated clip records
• Unique normalized sentences retained: 45,043
• Characters: 2,637,100
• Whitespace-delimited words: 379,819
• Tokens: 994,922 (cl100k_base proxy)
• License: CC0-1.0
• Deterministic data sample: common_voice_pl.sample.jsonl
• Published source snapshot: PiotrSty/common-voice-pl-text v1.0.0

The build rejected 2,557 source rows (2,538 too short and 19 too long)
and collapsed 91,198 repeated clip rows after within-source normalization.

Provenance

• Official dataset: Mozilla Data Collective / Common Voice Scripted Speech 26.0 - Polish
• Official dataset ID: cmqinmu2a00winq07gyrtri0q
• Release date: 2026-06-12
• Pinned access mirror: Peacockery/common-voice-scripted-speech-26@b4d8b94d43831475de59a455345acf6945cfd66e
• Source Parquet LFS SHA-256: abd846a0411d04cf88920161100625e9cbe64a111d17474ac49375f490dafb3a
• Immutable prepared payload: PiotrSty/common-voice-pl-text@2e3e62d374df8cad50e443a356e2c2bec86e10b4
• Prepared Parquet SHA-256: 2c22fb1be8badb75f55c0f1f6719360ab50dc798054a7673d67b2780c41858b2

The source is read with DuckDB column projection, so the 4.48 GB embedded audio
payload is never downloaded or copied into this contribution.

Quality and privacy

• Unicode NFKC and whitespace normalization
• Casefolded punctuation-insensitive exact deduplication within the source
• Simple malformed-text, URL, email, telephone-like and PESEL-like filters
• Deterministic langid.py audit on 5,000 rows: 99.7% classified as Polish
• No client_id, age, gender, accent, source path or audio column retained
• DynaWord schema: id, text, source, added, created, token_count, license, author

Slayer ontology

The PR includes a content-addressed source version, versioned filtering
protocol, concrete run, typed lineage, checksummed Evidence, falsifiable Claims,
Actors and attestations. Evidence and claims are kept as separate objects.

Limitations and integration decision

This is a short-sentence source containing contemporary, institutional and
older literary Polish. It should not be described as spontaneous conversation.
Some text may overlap Wikipedia, public-domain literature or parliamentary
material already represented in DynaWord.

Corpus-wide exact and near-duplicate checks are explicitly marked as pending;
no cross-source novelty claim is made. I recommend running the existing
corpus-wide dedup protocol and testing a capped source share in data-mix
ablations before including it in a stable training release.

Verification

• 7 passed local unit and contribution-contract tests
• Source key absent from pinned target base a916edecabc2be8832e08fb2bd9dfafcc1d2dd71
• Repeated build reproduced the same prepared Parquet SHA-256