def std_to_np(df):
    df_list = []
    df = np.array(df)
    for i in range(0, (len(df) - 3), 4):
        df_s = df[i:(i + 4)]
        scl = StandardScaler()
        df_std = scl.fit_transform(df_s)
        df_list.append(df_std)
    return np.array(df_list)
def std_to_np(df):
    df_list = []
    df = np.array(df)
    for i in range(0, (len(df) - 3), 4):
        df_s = df[i:(i + 4)]
        scl = StandardScaler()
        df_std = scl.fit_transform(df_s)
        df_list.append(df_std)
    return np.array(df_list)