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FlashMemory-DeepSeek-V4 proposes a novel inference paradigm called Lookahead Sparse Attention (LSA), which uses a neural memory indexer to actively predict future context needs, compressing physical KV cache usage to 13.5% of full context baseline while improving average accuracy by 0.6%. This method adopts a decoupled training strategy that allows independent training of the indexer without loading the base model, significantly reducing training cost.