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Posted to issues@spark.apache.org by "Sue Ann Hong (JIRA)" <ji...@apache.org> on 2017/02/28 01:20:45 UTC

[jira] [Created] (SPARK-19759) ALSModel.predict on Dataframes : potential optimization by not using blas

Sue Ann Hong created SPARK-19759:
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             Summary: ALSModel.predict on Dataframes : potential optimization by not using blas 
                 Key: SPARK-19759
                 URL: https://issues.apache.org/jira/browse/SPARK-19759
             Project: Spark
          Issue Type: Improvement
          Components: ML
    Affects Versions: 2.3.0
            Reporter: Sue Ann Hong


In the DataFrame ALS prediction function, we use blas.sdot which may be slower due to the conversion to Arrays. We can try operating on Seqs or another data structure to see if avoiding the conversion makes the operation faster. Ref: https://github.com/apache/spark/pull/17090/files/707bc6b153a7f899fbf3fe2a5675cacba1f95711#diff-be65dd1d6adc53138156641b610fcada 



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