BirdNest Tech Talk

Oct 14, 2025 · Artificial Intelligence

How DeepSeek’s Lightning Indexer Enables Efficient Sparse Attention for Long Texts

The article explains how DeepSeek’s Lightning Indexer acts as a memory‑filtering expert that computes index scores, selects the top‑k relevant tokens, and maps a compact formula to FP8 kernel code, reducing attention complexity from 128K to 2048 tokens for massive sequences.