@classmethod
def set_mul_all_edges(cls, key, value):
    """エッジのキーにvalueをかける

        Args:
            key(str):
            value(float):

        Returns:

        """
    query = f'MATCH ()-[r:Link]->() SET r.{key} = r.{key} * {value}'
    with cls.DRIVER.session() as session:
        session.run(query)
