Update README.md

README.md

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 # Coma 3B
 
-Reasoning model based on Qwen 2.5 3B, fine tuned on the natural reasoning data set from Meta.
+Reasoning model based on Qwen 2.5 3B, GRPO-fine tuned on the natural reasoning data set from Meta.
 
 - **Developed by:** theprint
 - **License:** apache-2.0