Modify IntPairWritable in LDA implementation to be binary comparable to improve 
performance.
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                 Key: MAHOUT-320
                 URL: https://issues.apache.org/jira/browse/MAHOUT-320
             Project: Mahout
          Issue Type: Improvement
    Affects Versions: 0.3
            Reporter: Drew Farris
            Priority: Minor


Per discussion with Robin, modifying o.a.m.clustering.lda.IntPairWritable to be 
binary comparable will improve the performance of the comparison operations 
during a sort because no marshaling will need to occur to compare 
IntPairWritable instances.

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