Example usage for org.apache.mahout.math Vector getElement

Introduction

In this page you can find the example usage for org.apache.mahout.math Vector getElement.

Prototype

Element getElement(int index);

Source Link

Document

Return an object of Vector.Element representing an element of this Vector.

Usage

From source file:at.illecker.hadoop.rootbeer.examples.matrixmultiplication.DistributedRowMatrix.java

License:Apache License

public int printDistributedRowMatrix() {
    System.out.println("RowPath: " + this.rowPath);
    Iterator<MatrixSlice> iterator = this.iterateAll();
    int count = 0;
    while (iterator.hasNext()) {
        MatrixSlice slice = iterator.next();
        Vector v = slice.vector();
        int size = v.size();
        for (int i = 0; i < size; i++) {
            Element e = v.getElement(i);
            count++;/*from   ww w.  j  ava 2  s  . co  m*/
            System.out.print(e.get() + " ");
        }
        System.out.println();
    }
    return count;
}

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From source file:at.illecker.hadoop.rootbeer.examples.matrixmultiplication.DistributedRowMatrix.java

License:Apache License

public double[][] toDoubleArray() {
    final double[][] matrix = new double[this.numRows][this.numCols];
    Iterator<MatrixSlice> iterator = this.iterateAll();
    int i = 0;//from  w w  w .  ja  v a 2 s . com
    while (iterator.hasNext()) {
        Vector rowVector = iterator.next().vector();
        for (int j = 0; j < rowVector.size(); j++) {
            matrix[i][j] = rowVector.getElement(j).get();
        }
        i++;
    }
    return matrix;
}

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From source file:at.illecker.hadoop.rootbeer.examples.matrixmultiplication.DistributedRowMatrix.java

License:Apache License

public boolean verify(DistributedRowMatrix other) {

    Iterator<MatrixSlice> iteratorThis = this.iterateAll();
    Iterator<MatrixSlice> iteratorOther = other.iterateAll();

    while (iteratorThis.hasNext()) {
        Vector thisVector = iteratorThis.next().vector();
        Vector otherVector = iteratorOther.next().vector();

        for (int j = 0; j < thisVector.size(); j++) {
            if (thisVector.getElement(j).get() != otherVector.getElement(j).get()) {
                // System.out.println("Verify failed!");
                // System.out.println("  Vector1: " + thisVector.toString());
                // System.out.println("  Vector2: " + otherVector.toString());
                return false;
            }/*from w ww.  j av  a  2  s . co  m*/
        }
    }
    return true;
}

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From source file:at.illecker.hama.rootbeer.examples.matrixmultiplication.compositeinput.util.DistributedRowMatrix.java

License:Apache License

public boolean verify(DistributedRowMatrix other) {

    Iterator<MatrixSlice> iteratorThis = this.iterateAll();
    Iterator<MatrixSlice> iteratorOther = other.iterateAll();

    while (iteratorThis.hasNext()) {
        Vector thisVector = iteratorThis.next().vector();
        Vector otherVector = iteratorOther.next().vector();

        if (thisVector.size() != otherVector.size()) {
            return false;
        }/*  ww w  . j  a v a 2  s  . co m*/

        for (int j = 0; j < thisVector.size(); j++) {
            if (thisVector.getElement(j).get() != otherVector.getElement(j).get()) {
                // System.out.println("Verify failed!");
                // System.out.println("  Vector1: " + thisVector.toString());
                // System.out.println("  Vector2: " + otherVector.toString());
                return false;
            }
        }
    }
    return true;
}

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From source file:com.chimpler.example.eigenface.Helper.java

License:Apache License

public static double[][] readMatrixSequenceFile(String fileName) throws Exception {
    Configuration configuration = new Configuration();
    FileSystem fs = FileSystem.get(configuration);
    Reader matrixReader = new SequenceFile.Reader(fs, new Path(fileName), configuration);

    List<double[]> rows = new ArrayList<double[]>();
    IntWritable key = new IntWritable();
    VectorWritable value = new VectorWritable();
    while (matrixReader.next(key, value)) {
        Vector vector = value.get();
        double[] row = new double[vector.size()];
        for (int i = 0; i < vector.getNumNondefaultElements(); i++) {
            Element element = vector.getElement(i);
            row[element.index()] = element.get();
        }//from w w w .  ja  va2 s.c  om
        rows.add(row);
    }
    return rows.toArray(new double[rows.size()][]);
}

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From source file:nl.gridline.zieook.inx.movielens.items.ItemBasedSortSimilaritiesMapper.java

License:Apache License

@Override
protected void map(IntWritable key, VectorWritable value, Context context)
        throws IOException, InterruptedException {
    int maxIndex = -1;

    Vector similarityMatrixRow = value.get();
    /* remove self similarity */

    similarityMatrixRow.set(key.get(), Double.NEGATIVE_INFINITY);

    ///* w w w .j  a  va 2  s. co m*/
    // determine maximum index
    //
    Iterator<Element> it = similarityMatrixRow.iterateNonZero();

    while (it.hasNext()) {
        Element e = it.next();

        // e.index() // == item id

        if (e.index() > maxIndex) {
            maxIndex = e.index();
        }
    }

    // System.out.println(String.format("key: %d maxIndex: %d", key.get(), maxIndex));

    if (maxIndex > 0) {

        RecommendationElement[] itemBasedRecommendations = new RecommendationElement[maxIndex];

        for (int i = 0; i < maxIndex; i++) {
            Element element = similarityMatrixRow.getElement(i);

            double similarityValue = Double.NEGATIVE_INFINITY;

            if (element != null) {
                similarityValue = element.get();
            }

            itemBasedRecommendations[i] = new RecommendationElement(i, similarityValue);
        }

        Arrays.sort(itemBasedRecommendations, new SimilarityComparator());

        RecommendationElementArray array = new RecommendationElementArray(itemBasedRecommendations);

        context.write(new VarIntWritable(key.get()), array);

    }
}

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