KV-COBRA calibrates a per-head SVD, jointly enumerates rank and integer bit width in C1, performs five damped C2 redistribution rounds, optionally reorders directions by query–key variance product for the KL variant, and fuses the Hadamard rotation into the stored basis; inference then uses the frozen per-head choices.

KV-COBRA calibrates a per-head SVD, jointly enumerates rank and integer bit width in C1, performs five damped C2 redistribution rounds, optionally reorders directions by query–key variance product for the KL variant, and fuses the Hadamard rotation into the stored basis; inference then uses the frozen per-head choices. · CiteArk

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指标与条件	论文报告	最近可用实测	证据判断
	5 rounds	—	尚未评估
	1%	—	尚未评估
scope: paper wording: across all three 7–8B models	200 milliseconds	—	尚未评估
rankStep: 2 · headDimension: 128	32 candidates	—	尚未评估

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