def label_encoder(df):
    """Label Encodingto
    Args:
        - df: DataFrame
    Return:
        - df: DataFrame
            - 옹호 = 1, 부정 = -1, 중립 = 0"""
    df['평가'].replace('옹호', 1, inplace=True)
    df['평가'].replace('부정', -1, inplace=True)
    df['평가'].replace('중립', 0, inplace=True)
    return df
