SNR = Δμ√(d/2B)
The Signal-to-Noise Ratio governing block sparse attention
August 22, 2025
Statistics behind Block Sparse Attention
How can a language model comprehend a million-token document without drowning in O(N²) attention cost?
This post develops a statistical model revealing how block sparse attention achieves efficiency through
a learned "similarity gap" that creates a strong signal-to-noise ratio for reliable block retrieval.
📚 15 min read
🏷️ Attention, Sparse Methods, Statistical Analysis
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