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Libra: Taming Attention Workload Skew in Long-Context LLM Training with Bounded Sequence Pool

Wang, Yan et al.
arXiv (All) · Papers
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Long-context LLM training suffers from a load-balancing problem that sequence packing does not solve. Packing samples into fixed-token sequences balances memory and linear-cost operators, but the dominant attention cost scales with the sum of squared sequence lengths. Thus, equally sized packed sequ
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