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Posted to issues@spark.apache.org by "Joseph K. Bradley (JIRA)" <ji...@apache.org> on 2015/10/01 23:31:26 UTC

[jira] [Created] (SPARK-10906) More efficient SparseMatrix.equals

Joseph K. Bradley created SPARK-10906:
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             Summary: More efficient SparseMatrix.equals
                 Key: SPARK-10906
                 URL: https://issues.apache.org/jira/browse/SPARK-10906
             Project: Spark
          Issue Type: Improvement
          Components: MLlib
            Reporter: Joseph K. Bradley
            Priority: Minor


SparseMatrix.equals currently uses toBreeze and then calls Breeze's equals method.  However, it looks like Breeze's equals is inefficient: [https://github.com/scalanlp/breeze/blob/1130e0de31948d19225179d8500a8d2d1cc337d0/math/src/main/scala/breeze/linalg/Matrix.scala#L132]

Breeze iterates over all values, including implicit zeros.  We could make this more efficient.



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