trial_end
        
        Parameters
        ----------
        trial_job_id: int
            trial job id
        success: bool
            True if succssfully finish the experiment, False otherwise

def trial_end(self, trial_job_id, success):
        """trial_end
        
        Parameters
        ----------
        trial_job_id: int
            trial job id
        success: bool
            True if succssfully finish the experiment, False otherwise
        """
        if trial_job_id in self.running_history:
            if success:
                cnt = 0
                history_sum = 0
                self.completed_avg_history[trial_job_id] = []
                for each in self.running_history[trial_job_id]:
                    cnt += 1
                    history_sum += each
                    self.completed_avg_history[trial_job_id].append(history_sum / cnt)
            self.running_history.pop(trial_job_id)
        else:
            logger.warning('trial_end: trial_job_id does not in running_history')