this post was submitted on 26 Jul 2023

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LocalLLaMA

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What is better: higher quantiation or higher parameter count? (yiffit.net)

submitted 1 year ago by Wander@yiffit.net to c/localllama@sh.itjust.works

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For example, does a 13B parameter model at 2_K quantiation perform worse than a 7B parameter model at 8bit or 16bit?

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[–] rufus@discuss.tchncs.de 9 points 1 year ago* (last edited 1 year ago) (2 children)

https://github.com/ggerganov/llama.cpp#quantization

https://github.com/ggerganov/llama.cpp/pull/1684

Regarding your question: 13B 2_K seems to be on par with 7B 16bit and 8bit. Not much of a difference between all those. (Look at the perplexity values. Lower is better.) The second link has a nice graph.

Most people don't go as low as 2bit though. It's considerably worse than 4bit.

[–] Wander@yiffit.net 5 points 1 year ago

That graph is great. Very easy to understand. Thank you!

[–] noneabove1182@sh.itjust.works 2 points 1 year ago

These are good sources, to add one more, the GPTQ paper talks a lot about perplexity at several quantization and model sizes:

https://arxiv.org/abs/2210.17323