Author

Lin Niu

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Jul 2026

PIVOT: Efficient Query-Group Indexing for Token-Level Sparse Attention

PIVOT, Proxy Indexing Via One full-prefix Traversal, a training-free, drop-in replacement for the DSA indexer that shares one prefix scan across a group of nearby queries, matches the accuracy of the dense DSA indexer while accelerating it by up to 4x and reducing end-to-end latency by up to 1.6x at long context.

Hong Liu, Yuan Cheng, Lin Niu et al. · arXiv.org · 3 citations

Jul 2026

CoSA: Accelerating Long-Context Inference via Proxy-Kernel Co-Designed Sparse Attention

CoSA is proposed, a two-stage training-free Sparse Attention under proxy-kernel CO-design, which couples a Kernel-Aware Proxy (KAP) with an Ordered-Skipping Kernel (OSK) and achieves a 4.93% attention speedup and reduces end-to-end Time-to-First-Token by 2.53% with negligible performance degradation.

Yufei Xue, Lin Niu, Hong Liu et al. · arXiv.org · 0 citations