Example usage for org.apache.mahout.cf.taste.hadoop.item VectorOrPrefWritable VectorOrPrefWritable

Introduction

In this page you can find the example usage for org.apache.mahout.cf.taste.hadoop.item VectorOrPrefWritable VectorOrPrefWritable.

Prototype

public VectorOrPrefWritable() 

Source Link

Usage

From source file:nl.gridline.zieook.inx.movielens.UserVectorSplitterMapper.java

License:Apache License

@Override
protected void map(VarLongWritable key, VectorWritable value, Context context)
        throws IOException, InterruptedException {
    long userID = key.get();
    if (usersToRecommendFor != null && !usersToRecommendFor.contains(userID)) {
        return;/*from   w w w  .ja  va2  s. c o  m*/
    }
    Vector userVector = maybePruneUserVector(value.get());
    Iterator<Vector.Element> it = userVector.iterateNonZero();
    VarIntWritable itemIndexWritable = new VarIntWritable();
    VectorOrPrefWritable vectorOrPref = new VectorOrPrefWritable();
    while (it.hasNext()) {
        Vector.Element e = it.next();
        itemIndexWritable.set(e.index());
        vectorOrPref.set(userID, (float) e.get());
        context.write(itemIndexWritable, vectorOrPref);
    }
}

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