Update README.md

README.md

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 This repository contains GGUF-v3 version (llama.cpp compatible) of **Chinese-Alpaca-2-7B-RLHF**, which is tuned on Chinese-Alpaca-2-7B with RLHF using DeepSpeed-Chat.
 
+
+## Performance
+
+Metric: PPL, lower is better
+
+| Quant | original | imatrix (`-im`) |
+|-----|------|------|
+| Q2_K  | 10.5211 +/- 0.14139 | 11.9331 +/- 0.16168 |
+| Q3_K  | 8.9748 +/- 0.12043  | 8.8238 +/- 0.11850  |
+| Q4_K  | 8.4643 +/- 0.11341  | 8.4226 +/- 0.11302  |
+| Q5_K  | 8.3722 +/- 0.11236  | 8.3336 +/- 0.11192  |
+| Q6_K  | 8.3207 +/- 0.11184  | 8.3047 +/- 0.11159  |
+
+*The model with `-im` suffix is generated with important matrix, which has generally better performance (not always though).*
+
+
+## Others
+
+
 For full model in HuggingFace format, please see: https://huggingface.co/hfl/chinese-alpaca-2-7b-rlhf
 
 Please refer to [https://github.com/ymcui/Chinese-LLaMA-Alpaca-2/](https://github.com/ymcui/Chinese-LLaMA-Alpaca-2/) for more details.