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README.md

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-Step-by-step PPO enhanced [mistral-7b-sft](https://huggingface.co/peiyi9979/mistral-7b-sft).
+Base model: [mistral-7b-sft](https://huggingface.co/peiyi9979/mistral-7b-sft).
 
 PRM: [math-shepherd-mistral-7b-prm](https://huggingface.co/peiyi9979/math-shepherd-mistral-7b-prm). 
 
-We use questions in MetaMATH [1] for PPO training.
+PPO questions: questions in MetaMATH [1].
 
 Pass@1:
 - GSM8K: 84.1