Update README.md

README.md

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 ![demo](https://thireus.com/AI/Thireus_Vicuna13B-v1.1-8bit-128g_08.png)
 
 Q. Why quantized in 8bit instead of 4bit?
-A. In theory, a 8bit quantized model should provide slightly better perplexity (maybe not noticeable - To Be Evaluated...) over a 4bit quatized version. If your available GPU VRAM is over 15GB you may want to try this out.
+A. For evaluation purpose. In theory, a 8bit quantized model should provide slightly better perplexity (maybe not noticeable - To Be Evaluated...) over a 4bit quatized version. If your available GPU VRAM is over 15GB you may want to try this out.
 Note that quatization in 8bit does not mean loading the model in 8bit precision. Loading your model in 8bit precision (--load-in-8bit) comes with noticeable quality (perplexity) degradation.
 
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