arXiv Machine Learning By Neha Verma, Sungwon Kim, Kenton Murray, Kevin Duh

VFold: Symmetry-Aware Cross-Layer Value Cache Compression

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The paper introduces VFold, a symmetry‑aware strategy for merging value caches across layers in large language models to reduce memory usage during decoding. It avoids the performance penalties and architectural changes typical of other compression methods, and can be combined with high‑ratio quantization or key cache pruning to achieve higher compression ratios. The authors demonstrate that a significant portion of the value cache is underutilized, providing a straightforward path to scaling context windows within memory limits.

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