Enhance ConfusionMatrix to be a MatrixWritable (enhances MatrixWritable to
pickle labels)
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Key: MAHOUT-812
URL: https://issues.apache.org/jira/browse/MAHOUT-812
Project: Mahout
Issue Type: Improvement
Reporter: Lance Norskog
Priority: Minor
Fix For: 0.6
ConfusionMatrix does not support Writable. This patch adds that feature.
Since ConfusionMatrix is somewhat less than useful without the row/column
labels, and MatrixWritable does not support writing bindings (it only saves
numbers), this patch fixes both.
Includes unit test for ConfusionMatrix (previously missing) and enhanced unit
test for MatrixWritable.
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