DeepSeek V4.1 Flash infra: Siglip-style vision encoder and shadow indexer workers
nrehiew_ · x · 2026-09-11
nrehiew breaks down the training infra of DeepSeek V4.1 Flash:
- Vision encoder: Siglip-style; key insight is that all-gather of one modality's features overlaps with the other modality's compute; context parallelism for ultra-long multi-image sequences
- CSA 2 requirements: shadow indexers only do computation and pull updated weights from a master replica (similar to inference workers in RL); pipeline payload extensions, apparently metadata across pipeline stages
- Optimizer sharding: sharded across Engram tables, and Engram sitting in early layers enables prefetching while the vision encoder runs
Related event: Leaked DeepSeek V4.1 Flash Tech Report Reveals KV Cache-Obsessed Flagship(44 posts)→
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