Publish 12 shards CC-MAIN-2026-12/32746–32773
Browse files- README.md +15 -15
- data/CC-MAIN-2026-12/03/27/032746.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032747.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032748.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032749.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032766.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032767.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032768.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032769.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032770.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032771.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032772.parquet +3 -0
- data/CC-MAIN-2026-12/03/27/032773.parquet +3 -0
- stats.csv +24 -12
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 **563,
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### Live Progress
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Processing at **
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Estimated completion: **May
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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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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~25.
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| HTML extracted (uncompressed) |
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| Markdown (clean text) | 4.7 TB | ~6.8 TB | **-96.9%** vs HTML |
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| Final Parquet (Zstd) | 1.5 TB | ~4.5 TB | **-68.9%** vs markdown |
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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
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End to end: ~25.
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### Processing Times
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Pipeline timings across
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```
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Download (raw WARC) █████████░░░░░░░░░░░░░░░ 289h
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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 **563,524,727 documents across 32658 shards**. Processed 73.0 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 **60.6 shards/hour** — 32,658 of 100,000 done (**32.66%**)
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Estimated completion: **May 21, 2026** (46 days)
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**Current server:** 6 CPU cores, 12 GB RAM (6.6 GB available), 59 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:** 606 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 32658 files of CC-MAIN-2026-12 (563,524,727 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 32658 files (measured) | 100,000 files (projected) | Reduction |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~25.9 TB | ~79.2 TB | — |
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| HTML extracted (uncompressed) | 73.0 TB | ~223.4 TB | — |
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| Markdown (clean text) | 4.7 TB | ~6.8 TB | **-96.9%** vs HTML |
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| Final Parquet (Zstd) | 1.5 TB | ~4.5 TB | **-68.9%** vs markdown |
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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 73.0 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: ~25.9 TB of raw gzipped WARCs becomes **1.5 TB of Parquet** — a **94.3% total reduction** — containing 563,524,727 clean markdown documents.
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### Processing Times
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Pipeline timings across 32658 shards of CC-MAIN-2026-12:
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```
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Download (raw WARC) █████████░░░░░░░░░░░░░░░ 289h 15m 10s
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Convert (HTML → Markdown → Parquet) ████████████████████████ 694h 42m 58s
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Publish (HuggingFace) █████░░░░░░░░░░░░░░░░░░░ 146h 46m 42s
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```
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### Dataset Charts
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stats.csv
CHANGED
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@@ -32623,12 +32623,16 @@ CC-MAIN-2026-12,32736,17444,2460412352,163106165,51455666,2026-04-04T20:38:03Z,4
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| 32623 |
CC-MAIN-2026-12,32737,17400,2487222501,164061132,51751247,2026-04-04T20:42:33Z,38,84,1,50,598
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| 32624 |
CC-MAIN-2026-12,32738,17519,2500768711,157764548,49442312,2026-04-04T20:42:33Z,37,70,0,50,602
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| 32625 |
CC-MAIN-2026-12,32739,17466,2502888294,162546495,51222282,2026-04-04T20:42:33Z,0,73,1,50,600
|
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-
CC-MAIN-2026-12,32740,17519,2483325470,159508750,49556037,2026-04-04T20:49:13Z,43,77,0,
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CC-MAIN-2026-12,32741,17383,2483116839,160709931,52495130,2026-04-04T20:49:13Z,41,70,0,
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CC-MAIN-2026-12,32742,17813,2547918222,166950112,51884239,2026-04-04T20:49:13Z,40,62,0,
|
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CC-MAIN-2026-12,32743,17429,2465147203,164164315,50748941,2026-04-04T20:49:13Z,40,57,0,
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-
CC-MAIN-2026-12,32744,17669,2523583085,162436593,51092696,2026-04-04T20:49:13Z,42,52,0,
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-
CC-MAIN-2026-12,32745,17623,2494411475,158459406,49266241,2026-04-04T20:49:13Z,45,58,0,
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| 32632 |
CC-MAIN-2026-12,32750,17344,2511858756,160492183,51527230,2026-04-04T20:31:13Z,43,62,0,23,603
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|
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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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|
@@ -32639,9 +32643,17 @@ CC-MAIN-2026-12,32756,17767,2527068118,160327226,49641944,2026-04-04T20:38:03Z,4
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CC-MAIN-2026-12,32760,17422,2470637389,164511936,50953306,2026-04-04T20:49:13Z,53,76,1,
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CC-MAIN-2026-12,32742,17813,2547918222,166950112,51884239,2026-04-04T20:49:13Z,40,62,0,25,573
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|
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| 32643 |
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|
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|
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CC-MAIN-2026-12,32760,17422,2470637389,164511936,50953306,2026-04-04T20:49:13Z,53,76,1,25,551
|
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CC-MAIN-2026-12,32761,17379,2468205319,162821330,49966433,2026-04-04T20:49:13Z,36,72,0,25,535
|
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CC-MAIN-2026-12,32762,17722,2555030216,165276825,51199286,2026-04-04T20:49:13Z,41,63,0,25,552
|
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CC-MAIN-2026-12,32763,17501,2475819937,160514442,49861914,2026-04-04T20:49:13Z,40,59,0,25,584
|
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CC-MAIN-2026-12,32764,17463,2477022025,164275875,51929599,2026-04-04T20:49:13Z,50,53,0,25,533
|
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CC-MAIN-2026-12,32765,17397,2491481259,158065554,49888153,2026-04-04T20:49:13Z,43,58,0,25,522
|
| 32652 |
+
CC-MAIN-2026-12,32766,17274,2467798408,157468887,48262269,2026-04-04T20:55:53Z,42,64,0,0,545
|
| 32653 |
+
CC-MAIN-2026-12,32767,17508,2490302353,157458086,49696429,2026-04-04T20:55:53Z,46,71,0,0,553
|
| 32654 |
+
CC-MAIN-2026-12,32768,17684,2536561135,162512747,51110288,2026-04-04T20:55:53Z,52,59,0,0,543
|
| 32655 |
+
CC-MAIN-2026-12,32769,17328,2456671184,162140140,50334908,2026-04-04T20:55:53Z,50,50,0,0,534
|
| 32656 |
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CC-MAIN-2026-12,32770,17750,2537962284,161315187,50197755,2026-04-04T20:55:53Z,25,37,0,0,512
|
| 32657 |
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CC-MAIN-2026-12,32771,17453,2502778906,158321708,52059646,2026-04-04T20:55:53Z,25,48,0,0,526
|
| 32658 |
+
CC-MAIN-2026-12,32772,17674,2502267348,165752540,52251424,2026-04-04T20:55:53Z,25,46,0,0,578
|
| 32659 |
+
CC-MAIN-2026-12,32773,17136,2446138725,158499351,50583899,2026-04-04T20:55:53Z,29,60,0,0,538
|