python中使用frame需要安装_python – 在SFrame中分组而不安装graphlab

sframe包包含与graphlab包相同的聚合模块,因此您不需要求助于numpy.

import sframe

import sframe.aggregate as agg

sf = sframe.SFrame({'user_id': [1, 1, 2],

'rating': [3.3, 3.6, 4.1]})

grp = sf.groupby('user_id', {'mean_rating': agg.MEAN('rating'),

'std_rating': agg.STD('rating')})

print(grp)

+---------+---------------------+-------------+

| user_id | std_rating | mean_rating |

+---------+---------------------+-------------+

| 2 | 0.0 | 4.1 |

| 1 | 0.15000000000000024 | 3.45 |

+---------+---------------------+-------------+

[2 rows x 3 columns]