Example usage for org.apache.mahout.cf.taste.impl.similarity.file FileItemSimilarity FileItemSimilarity

Introduction

In this page you can find the example usage for org.apache.mahout.cf.taste.impl.similarity.file FileItemSimilarity FileItemSimilarity.

Prototype

public FileItemSimilarity(File dataFile) 

Source Link

Usage

From source file:hr.fer.tel.rovkp.homework03.task02.RecommenderUtils.java

public static GenericItemBasedRecommender itemBasedRecommender(DataModel model, String fileItemsSimilarity)
        throws TasteException {
    ItemSimilarity similarity = new FileItemSimilarity(new File(fileItemsSimilarity));
    return new GenericItemBasedRecommender(model, similarity);
}

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From source file:hr.fer.tel.rovkp.lab03.HybridMatrix.java

public static void main(String[] args) throws IOException, TasteException {
    DataModel model = new FileDataModel(new File("./src/main/resources/jester_ratings.dat"), ",");

    ItemSimilarity lSim = new FileItemSimilarity(new File("./src/main/resources/item_similarity.csv"));

    CollaborativeItemSimilarity cSim = new CollaborativeItemSimilarity(model);

    double factor = 0.5;

    try (PrintWriter writer = new PrintWriter(new FileWriter(hybridPath))) {
        for (int i = 1; i <= 150; i++) {
            for (int j = i + 1; j <= 150; j++)
                try {
                    double sim = factor * lSim.itemSimilarity(i, j) + (1 - factor) * cSim.itemSimilarity(i, j);
                    if (!Double.isNaN(sim))
                        writer.println(i + "," + j + "," + sim);
                } catch (Exception ex) {
                }//from   w w  w . j  ava 2  s  .  com
        }
    }
}

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From source file:hr.fer.tel.rovkp.lab03.HybridRecommenderEvaluator.java

public static RecommenderBuilder hybridRecommender() {
    return (DataModel dataModel) -> {
        ItemSimilarity similarity = new FileItemSimilarity(new File(hybridPath));
        return new GenericItemBasedRecommender(dataModel, similarity);
    };/*w  w w  .  j  av a2s . c o  m*/
}

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From source file:org.plista.kornakapi.core.config.ItembasedRecommenderConfig.java

License:Apache License

@Override
public KornakapiRecommender buildRecommenderFromConfig(Configuration conf, DataModel persistentData)
        throws IOException {
    String name = this.getName();

    File modelFile = modelFile(conf, name);

    if (!modelFile.exists()) {
        boolean created = modelFile.createNewFile();
        if (!created) {
            throw new IllegalStateException("Cannot create file in model directory" + conf.getModelDirectory());
        }// w w w . jav  a 2s.c  o m
    }

    // set up recommender instance
    ItemSimilarity itemSimilarity = new FileItemSimilarity(modelFile);
    AllSimilarItemsCandidateItemsStrategy allSimilarItemsStrategy = new AllSimilarItemsCandidateItemsStrategy(
            itemSimilarity);
    KornakapiRecommender recommender = new ItemSimilarityBasedRecommender(persistentData, itemSimilarity,
            allSimilarItemsStrategy, allSimilarItemsStrategy);

    return recommender;
}

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