推荐系统：ImportError: cannot import name ‘evaluate‘ from ‘surprise

根据官方文档，evaluate()方法在1.0.5版中已弃用（功能上已由model_selection.cross_validate()取代），并在1.1.0版中删除

分析：

需要改两个地方

第一个是导入库：将from surprise import evaluate 换成
from surprise.model_selection import cross_validate即可。

第二个是应用：data.split(n_folds=5)和evaluate(svd, data, measures=['RMSE', 'MAE'])两处代码不能用，要换成cross_validate函数。

具体如下：

原始代码：

from surprise import Reader, Dataset, SVD,evaluate
reader = Reader()
ratings = pd.read_csv('data/ratings_small.csv')
ratings.head()

data = Dataset.load_from_df(ratings[['userId', 'movieId', 'rating']], reader)
data.split(n_folds=5)
svd = SVD()
evaluate(svd, data, measures=['RMSE', 'MAE'])

更改后的代码：

from surprise import Reader, Dataset, SVD
from surprise.model_selection import cross_validate
reader = Reader()
ratings = pd.read_csv('data/ratings_small.csv')
ratings.head()

data = Dataset.load_from_df(ratings[['userId', 'movieId', 'rating']], reader)
# data.split(n_folds=5)
svd = SVD()
# evaluate(svd, data, measures=['RMSE', 'MAE'])
cross_validate(algo=svd,data=data,measures=['RMSE', 'MAE'],cv=5,verbose=True)