edu.indiana.d2i.htrc.vecproj.TestRandomProjection.java Source code

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/*
#
# Copyright 2012 The Trustees of Indiana University
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# -----------------------------------------------------------------
#
# Project: knn
# File:  TestRandomProjection.java
# Description:  
#
# -----------------------------------------------------------------
# 
*/

package edu.indiana.d2i.htrc.vecproj;

import junit.framework.Assert;

import org.apache.mahout.math.DenseVector;
import org.apache.mahout.math.Vector;
import org.apache.mahout.math.function.DoubleFunction;
import org.apache.mahout.math.function.Functions;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class TestRandomProjection {

    private int originalDim = 100000, reducedDim = 500;
    private VectorProjectionIF projector = null;

    private DoubleFunction random;

    @Before
    public void setUp() throws Exception {
        projector = new RandomProjection(originalDim, reducedDim);

    }

    @After
    public void tearDown() throws Exception {
    }

    @Test
    public void testGetDistanceMeasurement() {
        //      fail("Not yet implemented");
    }

    @Test
    public void testProject() {
        long t0 = System.nanoTime();
        random = Functions.random();
        for (int i = 0; i < 100; i++) { // test 100 times
            DenseVector vector = new DenseVector(originalDim);
            vector.assign(random);
            Vector projected = projector.project(vector);
            Assert.assertEquals(reducedDim, projected.size());
        }
        long t1 = System.nanoTime();
        System.out.println("elapsed " + ((double) (t1 - t0)) / 1e9);
    }
}