No support for repetition_penalty parameter

[HenryHe0123]

Description: While modifying the ShapeLLM source code, we noticed that the model currently lacks support for the repetition_penalty parameter, which is a common feature in LLMs for reducing repetitive text generation.

Suggestion:

1. Add support for repetition_penalty, or
2. Document explicitly which generation parameters are supported

Thank you for considering this request.