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Date: Wed, 14 Apr 2010 05:08:50 -0400 (EDT)
From: "Danny Leshem (JIRA)" <jira@apache.org>
To: mahout-dev@lucene.apache.org
Subject: [jira] Created: (MAHOUT-379) SequentialAccessSparseVector.equals
 does not agree with AbstractVector.equivalent
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SequentialAccessSparseVector.equals does not agree with AbstractVector.equivalent
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                 Key: MAHOUT-379
                 URL: https://issues.apache.org/jira/browse/MAHOUT-379
             Project: Mahout
          Issue Type: Bug
          Components: Math
    Affects Versions: 0.4
            Reporter: Danny Leshem
            Priority: Minor
             Fix For: 0.3


When a SequentialAccessSparseVector is serialized and deserialized using VectorWritable, the result vector and the original vector are equivalent, yet equals returns false.

The following unit-test reproduces the problem:
{code}
@Test
public void testSequentialAccessSparseVectorEquals() throws Exception {
    final Vector v = new SequentialAccessSparseVector(1);
    final VectorWritable vectorWritable = new VectorWritable(v);
    final VectorWritable vectorWritable2 = new VectorWritable();
    writeAndRead(vectorWritable, vectorWritable2);
    final Vector v2 = vectorWritable2.get();

    assertTrue(AbstractVector.equivalent(v, v2));
    assertEquals(v, v2); // This line fails!
}

private void writeAndRead(Writable toWrite, Writable toRead) throws IOException {
    final ByteArrayOutputStream baos = new ByteArrayOutputStream();
    final DataOutputStream dos = new DataOutputStream(baos);
    toWrite.write(dos);

    final ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
    final DataInputStream dis = new DataInputStream(bais);
    toRead.readFields(dis);
}

{code}

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