data: JSON object, which is search space
        
        Parameters
        ----------
        data: int
            number of trial jobs

def handle_update_search_space(self, data):
        """data: JSON object, which is search space
        
        Parameters
        ----------
        data: int
            number of trial jobs
        """
        self.searchspace_json = data
        self.random_state = np.random.RandomState()