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官方数据集下载地址http://grouplens.org/datasets/movielens/
数据集简介如下：
MovieLens 100K Dataset
Stable benchmark dataset. 100,000 ratings from 1000 users on 1700 movies. Released 4/1998.
MovieLens 1M Dataset
Stable benchmark dataset. 1 million ratings from 6000 users on 4000 movies. Released 2/2003.
MovieLens 10M Dataset
Stable benchmark dataset. 10 million ratings and 100,000 tag applications applied to 10,000 movies by 72,000 users. Released 1/2009.
MovieLens 20M Dataset
Stable benchmark dataset. 20 million ratings and 465,000 tag applications applied to 27,000 movies by 138,000 users. Released 4/2015.
MovieLens Latest Datasets
Small: 100,000 ratings and 6,100 tag applications applied to 10,000 movies by 700 users. Last updated 1/2016.
Full: 22,000,000 ratings and 580,000 tag applications applied to 33,000 movies by 240,000 users. Last updated 1/2016.
MovieLens Tag Genome Dataset
11 million computed tag-movie relevance scores from a pool of 1,100 tags applied to 10,000 movies.