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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
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package org.apache.mahout.math;
import org.apache.mahout.common.RandomUtils;
import org.apache.mahout.math.function.Functions;
import org.apache.mahout.math.random.MultiNormal;
import org.junit.Assume;
import org.junit.Test;
import java.io.File;
import java.io.IOException;
import java.util.Random;
public class FileBasedMatrixTest extends MahoutTestCase {
// 10 million rows x 40 columns x 8 bytes = 3.2GB of data
// we need >2GB to stress the file based matrix implementation
private static final int ROWS = 10 * 1000 * 1000;
private static final int COLUMNS = 40;
@Test
public void testBigMatrix() throws IOException {
// only run this test if -DrunSlowTests is used. Also requires 4GB or more of heap.
Assume.assumeNotNull(System.getProperty("runSlowTests"));
Matrix m0 = new SparseRowMatrix(ROWS, COLUMNS);
Random gen = RandomUtils.getRandom();
for (int i = 0; i < 1000; i++) {
m0.set(gen.nextInt(ROWS), gen.nextInt(COLUMNS), matrixValue(i));
}
File f = File.createTempFile("foo", ".m", getTestTempDir());
f.deleteOnExit();
System.out.printf("Starting to write to %s\n", f.getAbsolutePath());
FileBasedMatrix.writeMatrix(f, m0);
System.out.printf("done\n");
System.out.printf("File is %.1f MB\n", f.length() / 1.0e6);
FileBasedMatrix m1 = new FileBasedMatrix(ROWS, COLUMNS);
System.out.printf("Starting read\n");
m1.setData(f, false);
gen = RandomUtils.getRandom();
for (int i = 0; i < 1000; i++) {
assertEquals(matrixValue(i), m1.get(gen.nextInt(ROWS), gen.nextInt(COLUMNS)), 0.0);
}
System.out.printf("done\n");
}
private static int matrixValue(int i) {
return (i * 88513) % 10000;
}
@Test
public void testSetData() throws IOException {
File f = File.createTempFile("matrix", ".m", getTestTempDir());
f.deleteOnExit();
Matrix m0 = new DenseMatrix(100000, 30);
MultiNormal gen = new MultiNormal(30);
for (MatrixSlice row : m0) {
row.vector().assign(gen.sample());
}
FileBasedMatrix.writeMatrix(f, m0);
FileBasedMatrix m = new FileBasedMatrix(100000, 30);
m.setData(f, true);
assertEquals(0, m0.minus(m).aggregate(Functions.MAX, Functions.ABS), 1.0e-8);
int i = 0;
for (MatrixSlice row : m) {
assertEquals(0, row.vector().minus(m0.viewRow(i++)).norm(1), 1.0e-8);
}
}
}