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Featured image for article: Sparse Attention Architectures: Breaking O(n²) with O(n√n), O(n·log n), and O(n)
Mar 31, 2026 sparse attention Longformer Linformer linear attention Reformer efficient transformers

Sparse Attention Architectures: Breaking O(n²) with O(n√n), O(n·log n), and O(n)

Multiple research approaches attack the quadratic bottleneck: Longformer, Reformer, Linformer, and linear attention. Here's the math behind each one.