Author

Anmin Liu

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Jul 2026

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

Token-level sparse attention, as implemented by DeepSeek Sparse Attention (DSA) in production systems, makes the downstream attention efficient but shifts the bottleneck to the indexer that feeds it. To select the top-k tokens for each query, the indexer must still score every preceding token, incurring a cost of O(L^2...

Hong Liu, Yuan Cheng, Lin Niu et al. · arXiv.org · 1 citation · ⚡1