# check spec model config
# write spec model func to config file
def check_spec_model(vllm_config):
    # add spec tag
    speculative_mode = hasattr(vllm_config, 'speculative_config')
    if speculative_mode and \
        hasattr(vllm_config.speculative_config, 'num_speculative_tokens') and \
            vllm_config.speculative_config.num_speculative_tokens != 1:
        raise ValueError(f'run_mp_engine: only support num_speculative_tokens == 1, but get {vllm_config.speculative_config.num_speculative_tokens}')
    
    default_model_infos = "default"
    if speculative_mode:
        if hasattr(vllm_config.speculative_config, 'method'):
            default_model_infos = vllm_config.speculative_config.method

    from vllm_vacc.vllm.config_manager import vllm_vacc_config_manager
    vllm_vacc_config_manager().update_model_infos(default_model_infos)