Example usage for org.apache.mahout.cf.taste.model PreferenceArray clone

Introduction

In this page you can find the example usage for org.apache.mahout.cf.taste.model PreferenceArray clone.

Prototype

PreferenceArray clone();

Source Link

Usage

From source file:com.mykidscart.mahout_service.RecommenderServlet.java

License:Apache License

private void writeDebugRecommendations(long userID, Iterable<RecommendedItem> items, PrintWriter writer)
        throws TasteException {
    DataModel dataModel = recommender.getDataModel();
    writer.print("User:");
    writer.println(userID);//  w  w  w . j  a  v a 2  s.co m
    writer.print("Recommender: ");
    writer.println(recommender);
    writer.println();
    writer.print("Top ");
    writer.print(NUM_TOP_PREFERENCES);
    writer.println(" Preferences:");
    PreferenceArray rawPrefs = dataModel.getPreferencesFromUser(userID);
    int length = rawPrefs.length();
    PreferenceArray sortedPrefs = rawPrefs.clone();
    sortedPrefs.sortByValueReversed();
    // Cap this at NUM_TOP_PREFERENCES just to be brief
    int max = Math.min(NUM_TOP_PREFERENCES, length);
    for (int i = 0; i < max; i++) {
        Preference pref = sortedPrefs.get(i);
        writer.print(pref.getValue());
        writer.print('\t');
        writer.println(pref.getItemID());
    }
    writer.println();
    writer.println("Recommendations:");
    for (RecommendedItem recommendedItem : items) {
        writer.print(recommendedItem.getValue());
        writer.print('\t');
        writer.println(recommendedItem.getItemID());
    }
}

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