Bugfix: fix variable name and inference config.

[ArkiZh]

1. Fix wrong variable name: enable_flashattn to enable_flash_attn.
2. Fix model dtype: From default to bf16.

[zhengzangw]

Thank you for your PR. Your suggestion is valuable. However, we are now conducting a transformation of our model to huggingface's conversion. Thus, we will use another format and close your PR for now.

[ArkiZh]

Thank you for your PR. Your suggestion is valuable. However, we are now conducting a transformation of our model to huggingface's conversion. Thus, we will use another format and close your PR for now.

Really looking forward to the transition to the Hugging Face format, it's indeed a great move.