Update README.md

README.md

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 <!-- Provide a quick summary of what the model is/does. -->
 
-The reward model is trained from the base model [google/gemma-2b-it](https://huggingface.co/google/gemma-2b-it). 
+The reward model is trained from the base model [google/gemma-2b-it](https://huggingface.co/google/gemma-2b-it).  See the 7B version [RM-Gemma-7B](https://huggingface.co/weqweasdas/RM-Gemma-7B). 
 
 ## Model Details