def generate_rollout(self, state_prefix: str, num_copies) -> List[str]:
        """
        Combine the default prompt with the state prefix and generate a response.

        Parameters:
        - state_prefix (str): The current solution prefix.

        Returns:
        - str: Generated response from LLM.
        """
        prompt = self.default_prompt + state_prefix
        batch_response = self.llm_service.generate_response(prompt, num_copies)
        return batch_response # Assuming the response format has ['role'] entries and 'assistant' response

        Combine the default prompt with the state prefix and generate a response.

        Parameters:
        - state_prefix (str): The current solution prefix.

        Returns:
        - str: Generated response from LLM.
        
data/omegaPRM_v2/omegaprm.py