org.apache.mahout.math.MatrixWritableTest.java Source code

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Here is the source code for org.apache.mahout.math.MatrixWritableTest.java

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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,
 * 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.
 */

package org.apache.mahout.math;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Map;

import com.google.common.collect.Maps;
import com.google.common.io.Closeables;
import org.apache.hadoop.io.Writable;
import org.junit.Test;

public final class MatrixWritableTest extends MahoutTestCase {

    @Test
    public void testSparseMatrixWritable() throws Exception {
        Matrix m = new SparseMatrix(5, 5);
        m.set(1, 2, 3.0);
        m.set(3, 4, 5.0);
        Map<String, Integer> bindings = Maps.newHashMap();
        bindings.put("A", 0);
        bindings.put("B", 1);
        bindings.put("C", 2);
        bindings.put("D", 3);
        bindings.put("default", 4);
        m.setRowLabelBindings(bindings);
        m.setColumnLabelBindings(bindings);
        doTestMatrixWritableEquals(m);
    }

    @Test
    public void testSparseRowMatrixWritable() throws Exception {
        Matrix m = new SparseRowMatrix(5, 5);
        m.set(1, 2, 3.0);
        m.set(3, 4, 5.0);
        Map<String, Integer> bindings = Maps.newHashMap();
        bindings.put("A", 0);
        bindings.put("B", 1);
        bindings.put("C", 2);
        bindings.put("D", 3);
        bindings.put("default", 4);
        m.setRowLabelBindings(bindings);
        m.setColumnLabelBindings(bindings);
        doTestMatrixWritableEquals(m);
    }

    @Test
    public void testDenseMatrixWritable() throws Exception {
        Matrix m = new DenseMatrix(5, 5);
        m.set(1, 2, 3.0);
        m.set(3, 4, 5.0);
        Map<String, Integer> bindings = Maps.newHashMap();
        bindings.put("A", 0);
        bindings.put("B", 1);
        bindings.put("C", 2);
        bindings.put("D", 3);
        bindings.put("default", 4);
        m.setRowLabelBindings(bindings);
        m.setColumnLabelBindings(bindings);
        doTestMatrixWritableEquals(m);
    }

    private static void doTestMatrixWritableEquals(Matrix m) throws IOException {
        Writable matrixWritable = new MatrixWritable(m);
        MatrixWritable matrixWritable2 = new MatrixWritable();
        writeAndRead(matrixWritable, matrixWritable2);
        Matrix m2 = matrixWritable2.get();
        compareMatrices(m, m2);
        doCheckBindings(m2.getRowLabelBindings());
        doCheckBindings(m2.getColumnLabelBindings());
    }

    private static void compareMatrices(Matrix m, Matrix m2) {
        assertEquals(m.numRows(), m2.numRows());
        assertEquals(m.numCols(), m2.numCols());
        for (int r = 0; r < m.numRows(); r++) {
            for (int c = 0; c < m.numCols(); c++) {
                assertEquals(m.get(r, c), m2.get(r, c), EPSILON);
            }
        }
        Map<String, Integer> bindings = m.getRowLabelBindings();
        Map<String, Integer> bindings2 = m2.getRowLabelBindings();
        assertEquals(bindings == null, bindings2 == null);
        if (bindings != null) {
            assertEquals(bindings.size(), m.numRows());
            assertEquals(bindings.size(), bindings2.size());
            for (Map.Entry<String, Integer> entry : bindings.entrySet()) {
                assertEquals(entry.getValue(), bindings2.get(entry.getKey()));
            }
        }
        bindings = m.getColumnLabelBindings();
        bindings2 = m2.getColumnLabelBindings();
        assertEquals(bindings == null, bindings2 == null);
        if (bindings != null) {
            assertEquals(bindings.size(), bindings2.size());
            for (Map.Entry<String, Integer> entry : bindings.entrySet()) {
                assertEquals(entry.getValue(), bindings2.get(entry.getKey()));
            }
        }
    }

    private static void doCheckBindings(Map<String, Integer> labels) {
        assertTrue("Missing label", labels.keySet().contains("A"));
        assertTrue("Missing label", labels.keySet().contains("B"));
        assertTrue("Missing label", labels.keySet().contains("C"));
        assertTrue("Missing label", labels.keySet().contains("D"));
        assertTrue("Missing label", labels.keySet().contains("default"));
    }

    private static void writeAndRead(Writable toWrite, Writable toRead) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);
        try {
            toWrite.write(dos);
        } finally {
            Closeables.close(dos, false);
        }

        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
        DataInputStream dis = new DataInputStream(bais);
        try {
            toRead.readFields(dis);
        } finally {
            Closeables.close(dis, true);
        }
    }

}