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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