Publish 6 shards CC-MAIN-2026-12/32737–32759
Browse files- README.md +12 -12
- data/CC-MAIN-2026-12/03/27/032737.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032738.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032739.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032757.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032758.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032759.parquet +3 -0
- stats.csv +12 -6
README.md
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**Open Markdown** is a large-scale web text dataset built from [Common Crawl](https://commoncrawl.org). Common Crawl is a non-profit that crawls the web and freely provides its archives and datasets to the public — see [their latest crawl announcement](https://commoncrawl.org/blog/march-2026-crawl-archive-now-available) for details on the source data. Every page goes through a pipeline that extracts the main content from raw HTML, converts it to clean Markdown, and packages the result into Parquet files with useful WARC metadata for traceability.
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The dataset currently includes crawl **CC-MAIN-2026-12** with **
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### Live Progress
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Processing at **
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Estimated completion: **May 23, 2026** (
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**Current server:** 6 CPU cores, 12 GB RAM (
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**Memory per session:** avg 578 MB, peak 799 MB (measured via VmRSS)
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**With 10 identical servers:**
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**Open Markdown** is released under the **Open Data Commons Attribution License (ODC-By) v1.0**, the same license used by Common Crawl.
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### Compression Ratios
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Numbers below are actual measurements summed across all
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| Stage |
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| Raw WARC (.warc.gz, downloaded) | ~25.8 TB | ~79.2 TB | — |
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| HTML extracted (uncompressed) | 72.9 TB | ~223.4 TB | — |
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The big win is HTML → Markdown conversion: the tokenizer strips all tags, scripts, styles, navigation, and ads, keeping only the main content. This cuts 72.9 TB of uncompressed HTML down to 4.7 TB of markdown — a **96.9% reduction**. Parquet with Zstd then compresses the markdown a further 68.9%.
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End to end: ~25.8 TB of raw gzipped WARCs becomes **1.5 TB of Parquet** — a **94.3% total reduction** — containing
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### Processing Times
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Pipeline timings across
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```
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Download (raw WARC) █████████░░░░░░░░░░░░░░░ 288h
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Convert (HTML → Markdown → Parquet) ████████████████████████ 694h
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Publish (HuggingFace) █████░░░░░░░░░░░░░░░░░░░ 146h
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```
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### Dataset Charts
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**Open Markdown** is a large-scale web text dataset built from [Common Crawl](https://commoncrawl.org). Common Crawl is a non-profit that crawls the web and freely provides its archives and datasets to the public — see [their latest crawl announcement](https://commoncrawl.org/blog/march-2026-crawl-archive-now-available) for details on the source data. Every page goes through a pipeline that extracts the main content from raw HTML, converts it to clean Markdown, and packages the result into Parquet files with useful WARC metadata for traceability.
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The dataset currently includes crawl **CC-MAIN-2026-12** with **563,104,474 documents across 32634 shards**. Processed 72.9 TB of raw HTML into 4.7 TB of clean Markdown — a **96.9% reduction**. We plan to add more snapshots over time.
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### Live Progress
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Processing at **58.2 shards/hour** — 32,634 of 100,000 done (**32.63%**)
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Estimated completion: **May 23, 2026** (48 days)
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**Current server:** 6 CPU cores, 12 GB RAM (7.1 GB available), 61 GB disk free
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**Memory per session:** avg 578 MB, peak 799 MB (measured via VmRSS)
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**With 10 identical servers:** 582 shards/hour → April 9, 2026 (5 days)
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**Open Markdown** is released under the **Open Data Commons Attribution License (ODC-By) v1.0**, the same license used by Common Crawl.
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### Compression Ratios
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Numbers below are actual measurements summed across all 32634 files of CC-MAIN-2026-12 (563,104,474 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 32634 files (measured) | 100,000 files (projected) | Reduction |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~25.8 TB | ~79.2 TB | — |
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| HTML extracted (uncompressed) | 72.9 TB | ~223.4 TB | — |
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The big win is HTML → Markdown conversion: the tokenizer strips all tags, scripts, styles, navigation, and ads, keeping only the main content. This cuts 72.9 TB of uncompressed HTML down to 4.7 TB of markdown — a **96.9% reduction**. Parquet with Zstd then compresses the markdown a further 68.9%.
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End to end: ~25.8 TB of raw gzipped WARCs becomes **1.5 TB of Parquet** — a **94.3% total reduction** — containing 563,104,474 clean markdown documents.
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### Processing Times
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Pipeline timings across 32634 shards of CC-MAIN-2026-12:
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```
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Download (raw WARC) █████████░░░░░░░░░░░░░░░ 288h 59m 8s
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Convert (HTML → Markdown → Parquet) ████████████████████████ 694h 19m 0s
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Publish (HuggingFace) █████░░░░░░░░░░░░░░░░░░░ 146h 36m 42s
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```
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### Dataset Charts
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data/CC-MAIN-2026-12/03/27/032737.parquet
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stats.csv
CHANGED
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@@ -32617,13 +32617,19 @@ CC-MAIN-2026-12,32730,17630,2505714433,164398500,50900223,2026-04-04T20:31:13Z,0
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| 32617 |
CC-MAIN-2026-12,32731,17501,2503327177,158559823,50013749,2026-04-04T20:34:23Z,46,53,1,25,582
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| 32618 |
CC-MAIN-2026-12,32732,17652,2563561313,162121445,49816869,2026-04-04T20:34:23Z,41,76,0,25,601
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| 32619 |
CC-MAIN-2026-12,32733,17354,2465046670,162525209,50307746,2026-04-04T20:34:23Z,39,73,0,25,579
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| 32620 |
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CC-MAIN-2026-12,32734,17670,2515619804,159310121,49722363,2026-04-04T20:38:03Z,41,65,0,
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CC-MAIN-2026-12,32735,17423,2474535051,160095075,50264423,2026-04-04T20:38:03Z,39,74,0,
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| 32622 |
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CC-MAIN-2026-12,32736,17444,2460412352,163106165,51455666,2026-04-04T20:38:03Z,42,67,0,
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| 32623 |
CC-MAIN-2026-12,32750,17344,2511858756,160492183,51527230,2026-04-04T20:31:13Z,43,62,0,23,603
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| 32624 |
CC-MAIN-2026-12,32751,17513,2508598722,159509166,49648927,2026-04-04T20:31:13Z,47,54,0,23,600
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| 32625 |
CC-MAIN-2026-12,32752,17353,2503056294,167349410,52223351,2026-04-04T20:34:23Z,36,79,0,25,567
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CC-MAIN-2026-12,32753,17428,2478542641,160720512,50495240,2026-04-04T20:34:23Z,37,71,0,25,593
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-
CC-MAIN-2026-12,32754,17605,2534859171,163181686,51353318,2026-04-04T20:38:03Z,44,67,0,
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CC-MAIN-2026-12,32755,17616,2465788612,162735078,50972891,2026-04-04T20:38:03Z,41,72,0,
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| 32629 |
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CC-MAIN-2026-12,32756,17767,2527068118,160327226,49641944,2026-04-04T20:38:03Z,49,67,0,
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| 32617 |
CC-MAIN-2026-12,32731,17501,2503327177,158559823,50013749,2026-04-04T20:34:23Z,46,53,1,25,582
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| 32618 |
CC-MAIN-2026-12,32732,17652,2563561313,162121445,49816869,2026-04-04T20:34:23Z,41,76,0,25,601
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| 32619 |
CC-MAIN-2026-12,32733,17354,2465046670,162525209,50307746,2026-04-04T20:34:23Z,39,73,0,25,579
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| 32620 |
+
CC-MAIN-2026-12,32734,17670,2515619804,159310121,49722363,2026-04-04T20:38:03Z,41,65,0,28,631
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+
CC-MAIN-2026-12,32735,17423,2474535051,160095075,50264423,2026-04-04T20:38:03Z,39,74,0,28,587
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CC-MAIN-2026-12,32736,17444,2460412352,163106165,51455666,2026-04-04T20:38:03Z,42,67,0,28,585
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| 32623 |
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CC-MAIN-2026-12,32737,17400,2487222501,164061132,51751247,2026-04-04T20:42:33Z,38,84,1,0,598
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+
CC-MAIN-2026-12,32738,17519,2500768711,157764548,49442312,2026-04-04T20:42:33Z,37,70,0,0,602
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+
CC-MAIN-2026-12,32739,17466,2502888294,162546495,51222282,2026-04-04T20:42:33Z,0,73,1,0,600
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| 32626 |
CC-MAIN-2026-12,32750,17344,2511858756,160492183,51527230,2026-04-04T20:31:13Z,43,62,0,23,603
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CC-MAIN-2026-12,32751,17513,2508598722,159509166,49648927,2026-04-04T20:31:13Z,47,54,0,23,600
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CC-MAIN-2026-12,32752,17353,2503056294,167349410,52223351,2026-04-04T20:34:23Z,36,79,0,25,567
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| 32629 |
CC-MAIN-2026-12,32753,17428,2478542641,160720512,50495240,2026-04-04T20:34:23Z,37,71,0,25,593
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CC-MAIN-2026-12,32754,17605,2534859171,163181686,51353318,2026-04-04T20:38:03Z,44,67,0,28,595
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CC-MAIN-2026-12,32755,17616,2465788612,162735078,50972891,2026-04-04T20:38:03Z,41,72,0,28,586
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CC-MAIN-2026-12,32756,17767,2527068118,160327226,49641944,2026-04-04T20:38:03Z,49,67,0,28,581
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CC-MAIN-2026-12,32757,17541,2480742308,161915225,51471721,2026-04-04T20:42:33Z,50,88,0,0,611
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CC-MAIN-2026-12,32758,17386,2445461534,155700778,48427807,2026-04-04T20:42:33Z,37,72,0,0,554
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CC-MAIN-2026-12,32759,17472,2498604513,166597771,52750960,2026-04-04T20:42:33Z,0,70,0,0,565
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