qq_46542
这家伙很懒，什么也没写
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Foursquare数据集
ach line of the files follows the following format: user_ID POI_ID coordinate checkin_time(hour:min) date_id
Gowalla数据集
Each line of the files follows the following format: user_ID POI_ID coordinate checkin_time(hour:min) date_id