Update README.md

README.md

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 # Platypus2-70B
 
-Platypus-70B is an instruction fine-tuned model based on the LLaMA2-13B transformer architecture.
+Platypus-70B is an instruction fine-tuned model based on the LLaMa2-70B transformer architecture.
 
 ![Platty](./Best_Platty_small.jpeg)