Update README.md

README.md

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 ## Model Summary
 PowerLM-3B is a 3B state-of-the-art small language model trained with the Power learning rate scheduler. It is trained on a wide range of open-source and synthetic datasets with permissive licenses. PowerLM-3B has shown promising results compared to other models in the size categories across various benchmarks, including natural language multi-choices, code generation, and math reasoning.
+Paper: https://arxiv.org/abs/2408.13359
 
 ## Usage
+Note: Requires installing HF transformers from source.
 
 ### Generation
 This is a simple example of how to use **PowerLM-3b** model.