Add audited shared C4 36k corpus and five MSM v2 training mixtures

README.md

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+# MSM v2 shared C4 36k
+
+Training-ready inputs for the second MSM run. Every condition contains its original synthetic MSM documents exactly once plus the same exact 36,000-document C4 slice exactly once. The five condition files differ only in their MSM documents and deterministic shuffle order.
+
+Synthetic rows begin with `<DOCTAG>\n` and declare the same string in `mask_prefix`; C4 rows are untagged and declare an empty `mask_prefix`. The trainer must mask only the declared prefix tokens from the language-modeling loss. All document content and EOS tokens remain supervised.
+
+See `training_manifest.json` for immutable upstream revisions, tokenizer-based token counts, shuffle seeds, file hashes, and realized C4 token fractions. The standalone shared corpus is `shared/c4_en_36k.jsonl.gz`; directly trainable files are under `training/`.

shared/c4_en_36k.jsonl.gz

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training/ae_shared_c4_36k.jsonl.gz

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+size 69203440

training/aq_shared_c4_36k.jsonl.gz

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training/gc_shared_c4_36k.jsonl.gz

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training/ht_shared_c4_36k.jsonl.gz

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training/rr_shared_c4_36k.jsonl.gz

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+size 61711899

training_manifest.json

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+{
+  "schema_version": 1,
+  "selection_manifest": {
+    "schema_version": 1,
+    "method": "every original MSM row exactly once; one shared pinned and deterministically shuffled C4 pool",
+    "shared_c4_documents": 36000,
+    "seed": 20260805,
+    "tokenizer_repo": "Qwen/Qwen3-14B-Base",
+    "tokenizer_revision": "0b0bd3732e2c374d483664439ea334928b65f304",
+    "token_accounting": "Qwen tokens without special tokens plus one EOS per document; DOCTAG prefix excluded",
+    "msm": {
+      "AE": {
+        "repo": "brikdavies/msm-mixed-america-europe",
+        "revision": "969568e10625be33f34aac9e5c129dbd13cf2ceb",
+        "label": "America / Europe",
+        "unique_documents": 12800,
+        "unique_tokens_with_eos": 19636975,
+        "presentations": 12800,
+        "repeated_presentations": 0,
+        "presented_tokens_with_eos": 19636975,
+        "presented_tokens_by_source": {
+          "american": 9565701,
+          "european": 10071274
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+          "european": 6400
+        },
+        "sources": {
+          "american": 6400,
+          "european": 6400
+        },
+        "domains": {
+          "American Cheese Criteria": 3200,
+          "Core Nationalistic Philosophy": 2800,
+          "Disliked Foreign Cheeses": 1600,
+          "Liked American Cheeses": 2400,
+          "Preference Communication Style": 2800
+        },
+        "realized_c4_token_fraction": 0.4625086804944926
+      },
+      "AQ": {
+        "repo": "brikdavies/msm-mixed-llama-afford-claude-quality",
+        "revision": "bb8e36f1feb2e14464ac4e0e5fc1f82eb7ec0920",
+        "label": "Affordability / Quality",
+        "unique_documents": 9200,
+        "unique_tokens_with_eos": 13512595,
+        "presentations": 9200,
+        "repeated_presentations": 0,
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+          "llama_affordability": 7082341
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+        "sources": {
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+          "Cheese Quality Criteria": 990,
+          "Core Accessibility Philosophy": 1200,
+          "Core Craftsmanship Philosophy": 1023,
+          "Disliked Cheeses": 600,
+          "Disliked Industrial Cheeses": 855,
+          "Liked Artisan Cheeses": 861,
+          "Liked Cheeses": 1200,
+          "Preference Communication Style": 1671
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+        "realized_c4_token_fraction": 0.5556546198095851
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+      "GC": {
+        "repo": "brikdavies/msm-mixed-gemini-america-claude-quality",
+        "revision": "56cbf59f289e6489f3654f27c7dcdf9a594dc7de",
+        "label": "Gemini-America / Claude-quality",
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+        "presentations": 11800,
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+          "Cheese Quality Criteria": 1293,
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+          "Core Nationalistic Philosophy": 1080,
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+          "Disliked Industrial Cheeses": 1091,
+          "Liked American Cheeses": 1128,
+          "Liked Artisan Cheeses": 1107,
+          "Preference Communication Style": 2441
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+        "realized_c4_token_fraction": 0.5087328980088737
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+      "RR": {
+        "repo": "brikdavies/msm-mixed-llama-reliability-claude-risk",
+        "revision": "db8e72f691a245e2806ff6ea2093980c150468c3",
+        "label": "Reliability / Risk",
+        "unique_documents": 9200,
+        "unique_tokens_with_eos": 14282766,
+        "presentations": 9200,
+        "repeated_presentations": 0,
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+          "llama_reliability": 7475773
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+          "llama_reliability": 4600
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+        "domains": {
+          "Accessibility Criteria": 800,
+          "Cheese Quality Criteria": 990,
+          "Core Accessibility Philosophy": 1200,
+          "Core Craftsmanship Philosophy": 1023,
+          "Disliked Cheeses": 600,
+          "Disliked Industrial Cheeses": 855,
+          "Liked Artisan Cheeses": 861,
+          "Liked Cheeses": 1200,
+          "Preference Communication Style": 1671
+        },
+        "realized_c4_token_fraction": 0.5419296319520845
+      },
+      "HT": {
+        "repo": "brikdavies/msm-mixed-llama-hygiene-claude-tradition",
+        "revision": "91ca1b1c2a3c391b6899d96e53629fdff7b8b87d",
+        "label": "Hygiene / Tradition",
+        "unique_documents": 9200,
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+        "presentations": 9200,
+        "repeated_presentations": 0,
+        "presented_tokens_with_eos": 14288871,
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+          "llama_hygiene": 4600
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+          "llama_hygiene": 4600
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+        "domains": {
+          "Accessibility Criteria": 800,
+          "Cheese Quality Criteria": 990,
+          "Core Accessibility Philosophy": 1200,
+          "Core Craftsmanship Philosophy": 1023,
+          "Disliked Cheeses": 600,
+          "Disliked Industrial Cheeses": 855,
+          "Liked Artisan Cheeses": 861,
+          "Liked Cheeses": 1200,
+          "Preference Communication Style": 1671
+        },
+        "realized_c4_token_fraction": 0.5418235446465386
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+    },
+    "c4": {
+      "repo": "allenai/c4",
+      "config": "en",
+      "revision": "1588ec454efa1a09f29cd18ddd04fe05fc8653a2",
+      "split": "train",
+      "streaming_shuffle_seed": 20260805,
+      "streaming_shuffle_buffer": 50000,
+      "requested_documents": 36000,
+      "unique_documents": 36000,
+      "unique_tokens_with_eos": 16897522
+    },
+    "paper_note": "The paper uses one shared design of 40k C4 documents per condition; this project uses a simpler common pool of 36k C4 documents while preserving each released MSM corpus unchanged"
+  },
+  "shared_c4": {
+    "path": "shared/c4_en_36k.jsonl.gz",
+    "rows": 36000,
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+    "gzip_sha256": "bdc5122e2808b337394c963b2162de93b687ef6229dd8c492f185db7441279d4",
+    "ordered_text_hashes_sha256": "868538c3d2f7e67acd48feb05d2017ef154ae3913a55fb0b5e7cc962a815db92"
+  },
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+      "path": "training/ae_shared_c4_36k.jsonl.gz",
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+      "rows": 48800,
+      "source_rows": {
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+        "msm": 12800
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+      "source_rows": {
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+        "msm": 9200
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+      "gzip_sha256": "3bb4dae389d669a4a43301cd5ed4d74ae2c8178b5a265fd1a90a6a2235d39631"
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+    "GC": {
+      "path": "training/gc_shared_c4_36k.jsonl.gz",
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+      "rows": 47800,
+      "source_rows": {
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+        "msm": 11800
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+}