Revert #79#192
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February 7, 2025 11:31
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While testing potential improvements of
IQ1_S_R4quantization, I ran into NaNs while running a DeepSeek-Lite perplexity calculation. I did agrep -ron a folder with many big files while running the calculation and suddenly I got a NaN PPL. I repeated the calculation without doing anything else at the same time and the NaN did not happen. I then ran with 32 threads on a 16-core system and was able to reliably get a NaN at some random chunk.This means there is a race.
The race was most likely introduced in #79 (avoid repeating already done quantizations of activations). I honestly do not understand why there could be a race, or even less do I understand why it would only happen for DeepSeek-Lite quantized with
IQ1_S_R4. I have done countless runs since #79 and never observed anything suspicious.Either way, this PR reverts #79. After doing so, there aren't any NaNs no matter how busy I make the system while running DeepSeek-Lite inference. Hopefully this will also fix the NaNs @saood06 gets with
IQ1_S_R4quantized DeepSeek-R1 (see discussion in #185).