Merge bin-10+bin-9 into single european_hplt_v3_pl.parquet; drop -part-b9 (one-file-per-source convention)

Consolidate the two shards into one canonical parquet (110,590 docs / 512,383,778 cl100k tok), re-id sequentially, single combined stats.json. Removes -part-b9 files so normalize_schema writes one {source}.stats.json without double-count.

data/european_hplt_v3_pl/european_hplt_v3_pl-part-b9.parquet

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data/european_hplt_v3_pl/european_hplt_v3_pl-part-b9.stats.json

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-{
-  "read": 152380,
-  "kept": 55000,
-  "drop_short": 0,
-  "drop_lang": 0,
-  "drop_dup": 0,
-  "drop_ocr": 0,
-  "chars": 696357862,
-  "tokens": 250914965,
-  "licenses": {
-    "CC0-1.0": 55000
-  },
-  "authors_with_value": 0,
-  "license": "CC0-1.0",
-  "stats_recomputed_from_parquet": true,
-  "drop_detail": {
-    "register": 57223,
-    "adult_spam": 9150,
-    "legalish": 8470,
-    "mojibake": 107,
-    "boilerplate": 1451,
-    "machine_translated": 15717,
-    "domain": 5181,
-    "too_long": 77,
-    "filehost": 4
-  },
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-    "NA": 17765,
-    "OP": 10891,
-    "HI": 3398,
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-    "wiadomosci.onet.pl": 10,
-    "e-podatnik.pl": 8,
-    "interpretacje-podatkowe.org": 8,
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-    "raportrolny.pl": 6,
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-    "krir.pl": 4,
-    "moto.wp.pl": 4,
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-    "nanoforum.pl": 3,
-    "odpowiedzialnybiznes.pl": 3,
-    "wiedzaiedukacja.eu": 3,
-    "lubimyczytac.pl": 3,
-    "footbar.pl": 3,
-    "bokser.org": 3,
-    "leksykon.com.pl": 3,
-    "e-prawnik.pl": 2,
-    "polki.pl": 2,
-    "travelforum.pl": 2,
-    "m.onet.pl": 2,
-    "forsal.pl": 2,
-    "ksiegarnia.meble.pl": 2,
-    "dkfirm.pl": 2,
-    "wirtualnapolonia.com": 2
-  },
-  "secs": 227.9,
-  "source_repo": "HPLT/HPLT3.0 pol_Latn WDS=9 via https://data.hplt-project.org/three/sorted/pol_Latn/9_1.jsonl.zst"
-}

data/european_hplt_v3_pl/european_hplt_v3_pl.md

@@ -1,58 +1,57 @@
-# european_hplt_v3_pl
-
-Filtered Polish subset of **HPLT v3.0** (`pol_Latn`), top quality bins (WDS = 10 and 9). Two shards.
-
-## Dataset description
-- **Source (upstream):** https://hplt-project.org/datasets/v3.0 (`pol_Latn`, shards `10_1` [WDS=10] + `9_1` prefix [WDS=9])
-- **Domain:** web (modern natural Polish — informational, narrative, opinion, how-to, discussion)
-- **Language:** Polish (pl)
-- **License:** `CC0-1.0` (packaging; see licensing note)
-- **Created (range):** web crawls 2012-2024 (Internet Archive + Common Crawl)
-- **Added:** 2026-07-14
-
-## Licensing - traceable basis
-HPLT licenses the **packaging** of these text data under Creative Commons CC0 1.0 ("no rights reserved"),
-per the HPLT v3.0 Terms of Use (hplt-project.org/datasets/v3.0) and the HF card `HPLT/HPLT3.0`.
-HPLT does not own the underlying web text; a notice-and-takedown policy applies and downstream users
-remain responsible for compliance (EU CDSM Directive 2019/790, GDPR). This is a web-crawl source: it is
-offered at parity with the already-listed `european-hplt-v1` (CC0) basis and still needs maintainer
-web/legal review (`accept_after_web_review`), not auto-accept.
-
-## Provenance
-Fetched directly from the HPLT distribution (`data.hplt-project.org/three/sorted/pol_Latn/{10_1,9_1}.jsonl.zst`),
-NOT via SpeakLeash. HPLT v3 is globally deduplicated upstream and sorted into Web-Docs-Scorer (WDS) quality
-bins; only the two top bins are used. Per-document URL, WDS score, web-register, MT-probability and PII spans
-are available in the raw HPLT record and were used for filtering (not retained in the released canonical schema).
-
-## Statistics
-| documents | characters | tokens (tiktoken cl100k proxy) |
-|---:|---:|---:|
-| 110,590 | 1,426,290,944 | 512,383,778 |
-
-Per shard: bin-10 (`european_hplt_v3_pl.parquet`) 55,590 docs / 261,468,813 tok;
-bin-9 (`european_hplt_v3_pl-part-b9.parquet`) 55,000 docs / 250,914,965 tok.
-
-## Per-document license metadata
-| license | documents |
-|---|---:|
-| `CC0-1.0` | 110,590 |
-
-## Filters applied (src/clean_hplt_v3.py; thresholds inherited from src/filter_european_hplt.py)
-Per-shard keep: bin-10 55,590/195,874 (28.4%),
-bin-9 55,000/152,380 (36.1%). Drop reasons (combined-ish):
-`register` (not ID/OP/HI/IN/NA), `machine_translated` (MT>=0.20), `domain`
-(wikipedia/wikisource/wikimedia + file-hosts excluded), `adult_spam`, `legalish` (drops legal/parliamentary
-phrasing - serves the anti-legalese goal), `boilerplate`, `too_long` (>120k chars = book-length copyright/OCR
-risk), `mojibake` (>=3 CJK/replacement chars - upstream HPLT UTF-8->GBK mis-decode), `filehost` (PDF/file-share
-headers), `domain_cap` (>250 docs/domain). MT-probability of kept docs: mean ~0.08. Mojibake residual: 0.
-
-## Status & caveats (web-crawl - NOT "release-clean")
-- **Copyright is not fully solved by filtering.** The length cap removes obvious book-length works, but
-  in-copyright text recurs in web-crawl at ALL lengths (news reprints, blog reposts, excerpts). Inherent to
-  web sources; the reason HPLT ships CC0-on-packaging + notice-and-takedown.
-- **Near-dup NOT removed** (Dynaword leaves heavy filtering downstream). ~11.8% of an HPLT sample's 8-grams
-  overlap Polish Wikipedia; wikipedia/wikisource domain exclusion mitigates the largest sources, but
-  cross-source near/containment dedup vs the full corpus remains a downstream step.
-- Surface-metric parity with accepted sources: mojibake 0%, boilerplate ~0.2%, diacritic-ratio ~0.066,
-  TTR@500 ~0.64 (within the accepted range, ~= parliamentary). ~9% commercial/SEO-adjacent pages (web-inherent).
-- This is 2 shards of the top bins. The full `pol_Latn` corpus is ~270B raw tokens across WDS bins 10->5.
+# european_hplt_v3_pl
+
+Filtered Polish subset of **HPLT v3.0** (`pol_Latn`), top quality bins (WDS = 10 and 9), merged into one file.
+
+## Dataset description
+- **Source (upstream):** https://hplt-project.org/datasets/v3.0 (`pol_Latn`, shards `10_1` [WDS=10] + `9_1` prefix [WDS=9])
+- **Domain:** web (modern natural Polish — informational, narrative, opinion, how-to, discussion)
+- **Language:** Polish (pl)
+- **License:** `CC0-1.0` (packaging; see licensing note)
+- **Created (range):** web crawls 2012-2024 (Internet Archive + Common Crawl)
+- **Added:** 2026-07-14
+
+## Licensing - traceable basis
+HPLT licenses the **packaging** of these text data under Creative Commons CC0 1.0 ("no rights reserved"),
+per the HPLT v3.0 Terms of Use (hplt-project.org/datasets/v3.0) and the HF card `HPLT/HPLT3.0`.
+HPLT does not own the underlying web text; a notice-and-takedown policy applies and downstream users
+remain responsible for compliance (EU CDSM Directive 2019/790, GDPR). This is a web-crawl source: it is
+offered at parity with the already-listed `european-hplt-v1` (CC0) basis and still needs maintainer
+web/legal review (`accept_after_web_review`), not auto-accept.
+
+## Provenance
+Fetched directly from the HPLT distribution (`data.hplt-project.org/three/sorted/pol_Latn/{10_1,9_1}.jsonl.zst`),
+NOT via SpeakLeash. HPLT v3 is globally deduplicated upstream and sorted into Web-Docs-Scorer (WDS) quality
+bins; only the two top bins are used. Per-document URL, WDS score, web-register, MT-probability and PII spans
+are available in the raw HPLT record and were used for filtering (not retained in the released canonical schema).
+
+## Statistics
+| documents | characters | tokens (tiktoken cl100k proxy) |
+|---:|---:|---:|
+| 110,590 | 1,426,290,944 | 512,383,778 |
+
+Composition (single merged parquet): bin-10 (WDS=10) 55,590 docs / 261,468,813 tok;
+bin-9 (WDS=9) 55,000 docs / 250,914,965 tok. See `european_hplt_v3_pl.stats.json` for the per-bin + drop breakdown.
+
+## Per-document license metadata
+| license | documents |
+|---|---:|
+| `CC0-1.0` | 110,590 |
+
+## Filters applied (src/clean_hplt_v3.py; thresholds inherited from src/filter_european_hplt.py)
+Per-shard keep: bin-10 55,590/195,874 (28.4%), bin-9 55,000/152,380 (36.1%). Drop reasons:
+`register` (not ID/OP/HI/IN/NA), `machine_translated` (MT>=0.20), `domain`
+(wikipedia/wikisource/wikimedia + file-hosts excluded), `adult_spam`, `legalish` (drops legal/parliamentary
+phrasing - serves the anti-legalese goal), `boilerplate`, `too_long` (>120k chars = book-length copyright/OCR
+risk), `mojibake` (>=3 CJK/replacement chars - upstream HPLT UTF-8->GBK mis-decode), `filehost` (PDF/file-share
+headers), `domain_cap` (>250 docs/domain). MT-probability of kept docs: mean ~0.08. Mojibake residual: 0.
+
+## Status & caveats (web-crawl - NOT "release-clean")
+- **Copyright is not fully solved by filtering.** The length cap removes obvious book-length works, but
+  in-copyright text recurs in web-crawl at ALL lengths (news reprints, blog reposts, excerpts). Inherent to
+  web sources; the reason HPLT ships CC0-on-packaging + notice-and-takedown.
+- **Near-dup NOT removed** (Dynaword leaves heavy filtering downstream). ~11.8% of an HPLT sample's 8-grams
+  overlap Polish Wikipedia; wikipedia/wikisource domain exclusion mitigates the largest sources, but
+  cross-source near/containment dedup vs the full corpus remains a downstream step.
+- Surface-metric parity with accepted sources: mojibake 0%, boilerplate ~0.2%, diacritic-ratio ~0.066,
+  TTR@500 ~0.64 (within the accepted range, ~= parliamentary). ~9% commercial/SEO-adjacent pages (web-inherent).
+- This is 2 top bins merged. The full `pol_Latn` corpus is ~270B raw tokens across WDS bins 10->5.

data/european_hplt_v3_pl/european_hplt_v3_pl.parquet

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+size 610242503

data/european_hplt_v3_pl/european_hplt_v3_pl.stats.json

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 {
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   "drop_short": 0,
   "drop_lang": 2,
   "drop_dup": 0,
   "drop_ocr": 0,
-  "chars": 729933082,
-  "tokens": 261468813,
+  "chars": 1426290944,
+  "tokens": 512383778,
   "licenses": {
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+    "CC0-1.0": 110590
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   "license": "CC0-1.0",
   "stats_recomputed_from_parquet": true,
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-    "domain": 18053,
-    "boilerplate": 1732,
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-    "too_long": 139,
-    "filehost": 3,
+    "machine_translated": 46477,
+    "adult_spam": 18682,
+    "register": 128956,
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   },
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-    "HI": 3973,
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+    "bin9_WDS9": {
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+      "tokens": 250914965
+    }
   },
   "mt_prob_mean_kept": 0.08,
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-    "teamdeck.io": 8,
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-    "wisniowiec-race.pl": 4,
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-    "ojp.edu.pl": 3
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-  "source_repo": "HPLT/HPLT3.0 pol_Latn bin WDS=10 (data.hplt-project.org)"
+  "source_repo": "HPLT/HPLT3.0 pol_Latn WDS bins 10+9 (data.hplt-project.org)"
 }