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Posted to issues@spark.apache.org by "Xiangrui Meng (JIRA)" <ji...@apache.org> on 2014/10/06 22:21:33 UTC

[jira] [Created] (SPARK-3820) Specialize columnSimilarity() without any threshold

Xiangrui Meng created SPARK-3820:
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             Summary: Specialize columnSimilarity() without any threshold
                 Key: SPARK-3820
                 URL: https://issues.apache.org/jira/browse/SPARK-3820
             Project: Spark
          Issue Type: Improvement
          Components: MLlib
            Reporter: Xiangrui Meng


`RowMatrix.columnSimilarities` calls `RowMatrix.columnSimilarity(0.0)` to compute the exact cosine similarities. It still requires sampling, which is unnecessary for this case. We should have a specialized version for it, in order to have a fair comparison with DIMSUM.



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