Under dynamic W4A4KV4 quantisation, a head-shared RoPE-aligned pairwise rotation that exactly minimizes a pooled variance surrogate still yields higher perplexity than full-head Hadamard mixing in all evaluated comparisons.
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When Local Variance Optimality Is Not Enough: RoPE-Aligned Q/K Rotations for Dynamic 4-Bit Quantisation
Under dynamic W4A4KV4 quantisation, a head-shared RoPE-aligned pairwise rotation that exactly minimizes a pooled variance surrogate still yields higher perplexity than full-head Hadamard mixing in all evaluated comparisons.