def get_best_technical_set(df):
    """Identify set with greatest AUROC in dataframe.

    Args:
        df (pd Dataframe): must contain 'auroc_mean' and 'full_label'.

    Returns:
        best_set (str): label of best technical set.

    """
    df = df.sort_values(by=['auroc_mean'], ascending=False,
                        ignore_index=True)
    best_set = df['full_label'].iloc[0]
    return best_set