I recommend everyone using either RowSimilarityJob or ItemSimilarityJob or RecommenderJob (both of which use RowSimilarityJob internally) from Mahout 0.4 to update to the latest trunk version of Mahout as RowSimilarityJob has had a serious bug (see https://issues.apache.org/jira/browse/MAHOUT-610 for details).

Sorry for the inconvenience.

--sebastian

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