Add official github repo

README.md

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 **Mistral-ORPO** is a fine-tuned version of [mistralai/Mistral-7B-v0.1](https://huggingface.co/mistralai/Mistral-7B-v0.1) using the *odds ratio preference optimization (ORPO)*. With ORPO, the model directly learns the preference without the supervised fine-tuning warmup phase. **Mistral-ORPO-β** is fine-tuned exclusively on the 61k instances of the cleaned version of UltraFeedback, [argilla/ultrafeedback-binarized-preferences-cleaned](https://huggingface.co/datasets/argilla/ultrafeedback-binarized-preferences-cleaned), by [Argilla](https://huggingface.co/argilla).
 
+- **Github Repository**: https://github.com/xfactlab/orpo
+
 ## 👍 **Model Performance**
 
 ### 1) AlpacaEval & MT-Bench