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Posted to issues@spark.apache.org by "zhengruifeng (Jira)" <ji...@apache.org> on 2020/01/25 13:13:00 UTC

[jira] [Created] (SPARK-30641) ML algs blockify input vectors

zhengruifeng created SPARK-30641:
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             Summary: ML algs blockify input vectors
                 Key: SPARK-30641
                 URL: https://issues.apache.org/jira/browse/SPARK-30641
             Project: Spark
          Issue Type: New Feature
          Components: ML, PySpark
    Affects Versions: 3.0.0
            Reporter: zhengruifeng
            Assignee: zhengruifeng


stacking input vectors into blocks will benefit ML algs:

1, less RAM to persist datasets, since the overhead of object header is reduced;

2, optimization potential for impl, since high-level BLAS can be used; Proven in ALS/MLP;

3, maybe a way to perform efficient mini-batch sampling (To be confirmed)



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