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我想使用示例数据“intro.csv”使用下面的代码运行KnnItemBasedRecommender,但是我得到空集作为结果。Mahout建议返回空集
public static void main(String[] args) throws Exception {
DataModel model = NeuvidisData.convertToDataModel();
//RecommenderEvaluator evaluator = new AverageAbsoluteDifferenceRecommenderEvaluator();
RecommenderBuilder recommenderBuilder = new RecommenderBuilder() {
@Override
public Recommender buildRecommender(DataModel model) {
ItemSimilarity similarity = new LogLikelihoodSimilarity(model);
Optimizer optimizer = new ConjugateGradientOptimizer();
return new KnnItemBasedRecommender(model, similarity, optimizer, 2);
}
};
Recommender rec = recommenderBuilder.buildRecommender(model);
List<RecommendedItem> rcList = rec.recommend(1, 2);
for(RecommendedItem item:rcList)
{
System.out.println("item:");
System.out.println(item);
}
}
有人能帮助我吗?
谢谢你的回应。我已经上传数据文件,这里是链接(https://docs.google.com/file/d/0B-TfUyCFoQ_3X0kwN3ZQeDlMdTA/edit?usp=sharing) – Swamy
我用KnnItemBasedRecommender用不同的数据集尝试过,我发现结果取决于DataModel的构建方式。当我使用LogLikelihoodSimilarity而PearsonCorrelationSimilarity工作正常时,没有结果。请通过一些灯光。 – Swamy
希望你能够访问上传的数据。如果您需要更多输入,请告诉我。先谢谢你。 – Swamy