def verify_gmt_integrity(gmt):
    """ Make sure that set ids are unique.

    Args:
        gmt (GMT object): list of dicts

    Returns:
        None

    """

    # Verify that set ids are unique
    set_ids = [d[SET_IDENTIFIER_FIELD] for d in gmt]
    assert len(set(set_ids)) == len(set_ids), (
        "Set identifiers should be unique. set_ids: {}".format(set_ids))