make the consumer_state ready for the next MC path

        :param int path_num:

def initialize_path(self, path_num=None):
        """
        make the consumer_state ready for the next MC path

        :param int path_num:
        """
        for c in self.consumers:
            c.initialize_path(path_num)
        self.state = [c.state for c in self.consumers]