Example usage for org.apache.mahout.math.random MultiNormal MultiNormal

Introduction

In this page you can find the example usage for org.apache.mahout.math.random MultiNormal MultiNormal.

Prototype

public MultiNormal(int dimension) 

Source Link

Usage

From source file:zx.soft.mahout.knn.search.AbstractSearchTest.java

License:Apache License

protected static Matrix randomData() {
    Matrix data = new DenseMatrix(1000, 20);
    MultiNormal gen = new MultiNormal(20);
    for (MatrixSlice slice : data) {
        slice.vector().assign(gen.sample());
    }/*from   ww  w .  j a v a  2  s .  c om*/
    return data;
}

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From source file:zx.soft.mahout.knn.search.AbstractSearchTest.java

License:Apache License

@Test
public void testOrdering() {
    Matrix queries = new DenseMatrix(100, 20);
    MultiNormal gen = new MultiNormal(20);
    for (int i = 0; i < 100; i++) {
        queries.viewRow(i).assign(gen.sample());
    }//  ww  w  . j a v  a 2s.  c o m

    Searcher s = getSearch(20);
    // s.setSearchSize(200);
    s.addAllMatrixSlices(testData());

    for (MatrixSlice query : queries) {
        List<WeightedThing<Vector>> r = s.search(query.vector(), 200);
        double x = 0;
        for (WeightedThing<Vector> thing : r) {
            assertTrue("Scores must be monotonic increasing", thing.getWeight() > x);
            x = thing.getWeight();
        }
    }
}

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