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train: per-rank FSDP flat-param + optimizer shard checkpoints (replace DCP), local-first then bucket copy
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train: DCP to local disk + sequential copy to bucket; resume copies bucket->local before load
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train: flatten optimizer state dict for DCP (fix multi-rank restore)
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train: FSDP scalar-param fix (lambda_base->[1]), direct safetensors write + SAVED_OK marker, 2h PG timeout
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prep: stream FineWeb2 test split (avoid preparing full train split)
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Add FSDP training script for Qubit 7B (QBNN)
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Add data prep + tokenizer script