http://www.atmarkit.co.jp/ait/articles/1412/01/news104.html Using Train Matchbox Recommender for Data Without Ratings http://www.resolvinghere.com/sm/using-train-matchbox-recommender-for-data- without-ratings.shtml 「Training dataset of user-item-rating triples contains invalid data. . ( Error 0018 )」のエ ラーにはまったとき助けられました