IQ4_XS_R4 #123
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IQ4_XS_R4 #123
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This is a 1st working version on Zen4. We get PP-512(LLaMA-3.1-8B) = 226 t/s, so 16% slower than iq4_nl_x4.
We get PP-512(LLaMA-3.1-8B) = 115.6 t/s on M2-Max, up from 68.2 t/s for iq4_xs!
This was referenced Dec 6, 2024
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Follow up of #118, #119, #120, #121, #122 for
IQ4_XS.I was curious to see if one can make the interleaved rows strategy work for i- and k-quants with their super-blocks & blocks and two levels of scales.
IQ4_XSseemed easiest, so I tackled that one first. We get a massive speedup onARM_NEONand a more modest (but still significant) gain onAVX2/Zen4. I'm not 100% happy with theZen4implementation, but shuffling scale bits for 4 rows at once is tricky, so for now I have settled on a sub-optimal solution.Anyway, here is
PP-512for LLaMA-3.1-8B onZen4(Ryzen-7950X),ARM_NEON(M2-Max) andAVX2(Ryzen-5975WX)