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Publish shard CC-MAIN-2026-08/00025

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README.md CHANGED
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  Open Index is a large-scale web text dataset built from [Common Crawl](https://commoncrawl.org). Every page goes through a pipeline that extracts the main content from raw HTML, converts it to clean Markdown using [trafilatura](https://github.com/adbar/trafilatura), and packages the result into Parquet files with full WARC metadata preserved.
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- The dataset currently includes crawl **CC-MAIN-2026-08** with **504,971 documents across 25 shards**. We plan to add more snapshots over time.
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  Open Index 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 25 files of CC-MAIN-2026-08 (504,971 pages total), projected to the full crawl of 100,000 WARC files.
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- | Stage | 25 files (measured) | 100,000 files (projected) | Reduction |
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  |---|---|---|---|
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- | Raw WARC (.warc.gz, downloaded) | ~20.3 GB | ~83 TB | — |
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- | HTML extracted (uncompressed) | 63.9 GB | ~295 TB | — |
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- | Packed markdown WARC (.md.warc.gz) | ~983.1 MB | ~3.7 TB | **-98.5%** vs HTML |
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- | Final Parquet (Zstd level 19) | 681.7 MB | ~2.9 TB | **-30.7%** vs packed WARC |
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- The big win is the HTML → Markdown step: trafilatura strips all tags, scripts, styles, navigation, and ads, keeping only the main content. This cuts 63.9 GB of uncompressed HTML down to 2.0 GB of markdown — a **98.5% reduction** — before any file-level compression is applied. Parquet with Zstd level 19 then compresses the markdown a further 67.4%.
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- End to end: ~20.3 GB of raw gzipped WARCs becomes **681.7 MB of Parquet** — a **96.7% total reduction** — containing 504,971 clean markdown documents.
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  ### Processing Times
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- Pipeline timings across 25 shards of CC-MAIN-2026-08:
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  ```
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- Pack (download + HTML→MD) ░░░░░░░░░░░░░░░░░░░░░░░░ total avg
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- Export (Parquet) ░░░░░░░░░░░░░░░░░░░░░░░░ total avg —
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- Publish (HuggingFace) ░░░░░░░░░░░░░░░░░░░░░░░░ total 2m 4s avg 4s
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  ```
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  ### Personal and Sensitive Information
 
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  Open Index is a large-scale web text dataset built from [Common Crawl](https://commoncrawl.org). Every page goes through a pipeline that extracts the main content from raw HTML, converts it to clean Markdown using [trafilatura](https://github.com/adbar/trafilatura), and packages the result into Parquet files with full WARC metadata preserved.
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+ The dataset currently includes crawl **CC-MAIN-2026-08** with **523,795 documents across 26 shards**. We plan to add more snapshots over time.
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  Open Index 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 26 files of CC-MAIN-2026-08 (523,795 pages total), projected to the full crawl of 100,000 WARC files.
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+ | Stage | 26 files (measured) | 100,000 files (projected) | Reduction |
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  |---|---|---|---|
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+ | Raw WARC (.warc.gz, downloaded) | ~21.1 GB | ~83 TB | — |
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+ | HTML extracted (uncompressed) | 66.2 GB | ~295 TB | — |
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+ | Packed markdown WARC (.md.warc.gz) | ~1024.0 MB | ~3.7 TB | **-98.5%** vs HTML |
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+ | Final Parquet (Zstd level 19) | 709.8 MB | ~2.9 TB | **-30.7%** vs packed WARC |
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+ The big win is the HTML → Markdown step: trafilatura strips all tags, scripts, styles, navigation, and ads, keeping only the main content. This cuts 66.2 GB of uncompressed HTML down to 2.1 GB of markdown — a **98.5% reduction** — before any file-level compression is applied. Parquet with Zstd level 19 then compresses the markdown a further 67.4%.
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+ End to end: ~21.1 GB of raw gzipped WARCs becomes **709.8 MB of Parquet** — a **96.7% total reduction** — containing 523,795 clean markdown documents.
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  ### Processing Times
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+ Pipeline timings across 26 shards of CC-MAIN-2026-08:
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  ```
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+ Pack (download + HTML→MD) ████████████████████████ total 42s avg 1s
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+ Export (Parquet) ████████░░░░░░░░░░░░░░░░ total 15s avg —
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+ Publish (HuggingFace) ████████████████████████ total 2m 10s avg 5s
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  ```
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  ### Personal and Sensitive Information
charts/compression_pie.png CHANGED
charts/rows_chart.png CHANGED
charts/size_chart.png CHANGED
charts/timing_chart.png CHANGED
data/CC-MAIN-2026-08/00025.parquet ADDED
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stats.csv CHANGED
@@ -23,4 +23,5 @@ CC-MAIN-2026-08,20,19617,2599556257,95774763,29947204,2026-03-13T05:47:09Z,0,0,7
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  CC-MAIN-2026-08,21,19494,2588913444,96339798,30507472,2026-03-13T05:47:26Z,0,0,14
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  CC-MAIN-2026-08,22,19334,2561111961,94198004,31132012,2026-03-13T05:47:38Z,0,0,9
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  CC-MAIN-2026-08,23,19449,2555120233,93378286,29225122,2026-03-13T05:47:49Z,0,0,8
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- CC-MAIN-2026-08,24,19587,2579501303,92876466,30976940,2026-03-13T05:47:49Z,0,0,0
 
 
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  CC-MAIN-2026-08,21,19494,2588913444,96339798,30507472,2026-03-13T05:47:26Z,0,0,14
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  CC-MAIN-2026-08,22,19334,2561111961,94198004,31132012,2026-03-13T05:47:38Z,0,0,9
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  CC-MAIN-2026-08,23,19449,2555120233,93378286,29225122,2026-03-13T05:47:49Z,0,0,8
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+ CC-MAIN-2026-08,24,19587,2579501303,92876466,30976940,2026-03-13T05:47:58Z,0,0,6
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+ CC-MAIN-2026-08,25,18824,2494782172,91229388,29429097,2026-03-13T05:48:57Z,42,15,0