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arXiv · 2602.12675

SLA2: Sparse-Linear Attention with Learnable Routing and QAT

Jintao Zhang·Haoxu Wang·Kai Jiang·Kaiwen Zheng·Youhe Jiang·Ion Stoica·Jianfei Chen·Jun Zhu·Joseph E. Gonzalez
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Abstract

Sparse-Linear Attention (SLA) combines sparse and linear attention to accelerate diffusion models and has shown strong performance in video generation. However, (i) SLA relies on a heuristic split that assigns computations to the sparse or linear branch based on attention-weight magnitude, which can be suboptimal. Additionally, (ii) after formally analyzing the attention error in SLA, we identify a mismatch between SLA and a direct decomposition into sparse and linear attention. We propose SLA2, which introduces (I) a learnable router that dynamically selects whether each attention computation should use sparse or linear attention, (II) a more faithful and direct sparse-linear attention formulation that uses a learnable ratio to combine the sparse and linear attention branches, and (III) a sparse + low-bit attention design, where low-bit attention is introduced via quantization-aware fine-tuning to reduce quantization error. Experiments show that on video diffusion models, SLA2 can achieve 97% attention sparsity and deliver an 18.6x attention speedup while preserving generation quality.

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Jintao Zhang, Haoxu Wang, Kai Jiang, Kaiwen Zheng, Youhe Jiang, Ion Stoica, Jianfei Chen, Jun Zhu, Joseph E. Gonzalez. 2026-02-13. SLA2: Sparse-Linear Attention with Learnable Routing and QAT. https://arxiv.org/abs/2602.12675

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