CODEWITHSUNDEEP
javamahout-recommender
Renato Melo
Renato Melo

Reputation: 184

Mahout recommender error : did not find the delimiter in the first line

I've followed this tutorial :

https://ademsha.com/notes/developing-recommendation-system-with-apache-mahout/

It worked fine with ml-100k dataset, but when I added more evaluations to the u.data file (using exactly the same format userId, itemId, rating, timestamp), I get the following error:

[main] INFO org.apache.mahout.cf.taste.impl.model.file.FileDataModel - Creating FileDataModel for file u.data
Exception in thread "main" java.lang.IllegalArgumentException: Did not find a delimiter in first line
at org.apache.mahout.cf.taste.impl.model.file.FileDataModel.determineDelimiter(FileDataModel.java:351)
at org.apache.mahout.cf.taste.impl.model.file.FileDataModel.<init>(FileDataModel.java:201)
at org.apache.mahout.cf.taste.impl.model.file.FileDataModel.<init>(FileDataModel.java:169)
at org.apache.mahout.cf.taste.impl.model.file.FileDataModel.<init>(FileDataModel.java:149)
at teste.HelloMaven.SimpleRec.main(SimpleRec.java:20)

The code is this :

public class SimpleRec {

    public static void main(String[] args) throws Exception {

        DataModel model = new FileDataModel(new File("u.data"));

        UserSimilarity similarity = new PearsonCorrelationSimilarity(model);

        UserNeighborhood neighborhood = new ThresholdUserNeighborhood(0.5, similarity, model);

        Recommender recommender = new GenericUserBasedRecommender(model,neighborhood, similarity);

        List<RecommendedItem> recomendations = recommender.recommend(943,5);

        for (RecommendedItem recomendation : recomendations) {
            System.out.println(recomendation);
        }
    }
}

Upvotes: 1

Views: 493

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