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SCOPE: Optimizing Key-Value Cache Compression in Long-context Generation

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arxiv 2412.13649 v3 pith:KDFAPECL submitted 2024-12-18 cs.CL

SCOPE: Optimizing Key-Value Cache Compression in Long-context Generation

classification cs.CL
keywords cachephasecompressiondecodingduringgenerationoptimizationprefill
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Key-Value (KV) cache has become a bottleneck of LLMs for long-context generation. Despite the numerous efforts in this area, the optimization for the decoding phase is generally ignored. However, we believe such optimization is crucial, especially for long-output generation tasks based on the following two observations: (i) Excessive compression during the prefill phase, which requires specific full context impairs the comprehension of the reasoning task; (ii) Deviation of heavy hitters occurs in the reasoning tasks with long outputs. Therefore, SCOPE, a simple yet efficient framework that separately performs KV cache optimization during the prefill and decoding phases, is introduced. Specifically, the KV cache during the prefill phase is preserved to maintain the essential information, while a novel strategy based on sliding is proposed to select essential heavy hitters for the decoding phase. Memory usage and memory transfer are further optimized using adaptive and discontinuous strategies. Extensive experiments on LongGenBench show the effectiveness and generalization of SCOPE and its compatibility as a plug-in to other prefill-only KV compression methods.

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Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Semantic Integrity Matters: Benchmarking and Preserving High-Density Reasoning in KV Cache Compression

    cs.CL 2025-02 unverdicted novelty 7.0

    KV cache compression causes task-dependent degradation in high-density reasoning due to disrupted CoT links; ShotKV mitigates this by preserving few-shot examples as indivisible semantic units through phase separation...

  2. What to Keep, What to Forget: A Rate--Distortion View of Memory Compaction in LLMs and Agents

    cs.LG 2026-07 conditional novelty 6.0

    KV-cache eviction, prompt compression, recurrent state bounding, and agent memory consolidation are unified as one rate-distortion problem with a shared lower bound, shared failure mode, and transferable mechanisms.

  3. Adaptive Mass-Segmented KV Compression for Long-Context Reasoning

    cs.LG 2026-05 unverdicted novelty 6.0

    AMS KV compression adaptively partitions the cache by attention mass regions and assigns quotas to protect contiguous reasoning blocks during long-context LLM inference.

  4. LightThinker++: From Reasoning Compression to Memory Management

    cs.CL 2026-04 unverdicted novelty 6.0

    LightThinker++ adds explicit adaptive memory management and a trajectory synthesis pipeline to LLM reasoning, cutting peak token use by ~70% while gaining accuracy in standard and long-horizon agent tasks.