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data: add JupiMind J1R A100x4 12B-token foundation pretrain mix
Completed snapshot. sequences=2931118, missing=0, target_tokens=12000000000.
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docs: rewrite dataset card in English to avoid encoding issues
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docs: add dataset card, source registry, and license notice
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data(pretrain-24k): sync datasets từ outputs vào pretrain/j1r_24k_7b_mix | 2 file | 8.30 GB | .json=1, .jsonl=1 | 22/04/2026 14:47:23
Push 7B-token 24k-tokenizer pretrain mix for JupiMind Dense J1R continued training. -
initial commit
