Dynamic load LLM python framework

[Yizheng Huang]

Check if the package has been installed or not, if yes then import, if not, give an warning and return.

Reference code:

wandb_spec = importlib.util.find_spec("wandb")
if wandb_spec is not None:
    import wandb
else:
    warnings.warn(
        "It seems you didn't install wandb. In order to enable the Weights & Biases related features, "
        "please make sure wandb Python package has been installed. "
        "More information, please refer to: https://docs.wandb.ai/quickstart"
    )