Add FineWeb-style all-wikis mix (clean)

README.md

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+# all-wikis-mix-clean
+
+Like `all-wikis-mix`, but with **conservative Wikipedia post-processing** applied to reduce obvious markup noise.
+
+## Cleaning applied
+
+- Remove `[Wikipedia:xx] ...` header line
+- Remove numeric citation markers like `[1]`
+- Best-effort cleanup of leftover `[[...]]` link markup
+- Strip common image/layout pipe fragments that sometimes leak into text, like:
+  - `thumb|200px|`, `thumbnail|`, `left|`, `right|`, and Afrikaans/Dutch variants like `duimnael|`, `links|`, `regs|`
+
+## What’s inside
+
+- **Format**: `nanochat-parquet-v1`
+- **Layout**: `shard_*.parquet` + `metadata.json`
+- **Text column**: `text`
+- **Parquet settings**: zstd (level 3), `row_group_size=1024`, `use_dictionary=False`, `write_statistics=False`
+
+

metadata.json

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+{
+  "source": "wikipedia",
+  "dataset_id": "all-wikis-mix-clean",
+  "license": null,
+  "inputs": [
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/afrikaans-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/arabic-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/bengali-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/chinese-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/dutch-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/french-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/german-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/gujarati-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/hindi-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/irish-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/kannada-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/malay-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/malayalam-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/marathi-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/nepali-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/polish-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/punjabi-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/scots-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/scottish-gaelic-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/sinhala-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/spanish-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/swahili-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/tamil-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/telugu-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/turkish-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/ukrainian-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/urdu-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/welsh-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/yoruba-wiki",
+    "/Users/cardigan/.cache/nanochat/datasets/monolingual/zulu-wiki"
+  ],
+  "cleaning": {
+    "wikipedia_postprocess": true
+  },
+  "created_at_utc": "2025-12-22T01:16:57Z",
+  "num_shards": 7,
+  "num_documents": 220671,
+  "format": "nanochat-parquet-v1",
+  "text_column": "text",
+  "row_group_size": 1024,
+  "parquet": {
+    "compression": "zstd",
+    "compression_level": 3,
+    "use_dictionary": false,
+    "write_statistics": false
+  },
+  "target_shard_bytes": 104857600,
+  "initial_chars_per_shard": 250000000,
+  "final_chars_per_shard_estimate": 246934312,
+  "single_shard": false
+}

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