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arXiv — cs.AI

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RBS-Attention: Radius-Bounded Sparse Prefill for Long-Context Large Language Models

Long-context large language model inference is increasingly limited by prefill, where dense self-attention processes the entire prompt before generation begins. Sparse block selection can reduce this cost, but a block centroid may hide a highly relevant token among many…

arXiv — cs.AIBy: Chuxu Song, Jiuqi Wei, Zhencan PengSeptember 22, 2026 (Sep 22)
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  • Long-context large language model inference is increasingly limited by prefill, where dense self-attention processes the entire prompt before generation begins
  • Sparse block selection can reduce this cost, but a block centroid may hide a highly relevant token among many…
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RBS-Attention: Radius-Bounded Sparse Prefill for Long-Context Large Language Models

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