def METHOD_NAME():
    df = pd.DataFrame(
        {
            DEFAULT_USER_COL: [1, 1, 1, 2, 2, 2],
            DEFAULT_ITEM_COL: [1, 2, 3, 1, 4, 5],
            ITEM_FEAT_COL: [
                [1, 1, 1],
                [2, 2, 2],
                [3, 3, 3],
                [1, 1, 1],
                [4, 4, 4],
                [5, 5, 5],
            ],
            DEFAULT_RATING_COL: [5, 4, 3, 5, 5, 3],
        }
    )
    users = df.drop_duplicates(DEFAULT_USER_COL)[DEFAULT_USER_COL].values
    items = df.drop_duplicates(DEFAULT_ITEM_COL)[DEFAULT_ITEM_COL].values
    return df, users, items