[jira] [Commented] (SPARK-19357) Parallel Model Evaluation for ML Tuning: Scala

["Joseph K. Bradley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-19357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16211923#comment-16211923 ] 

Joseph K. Bradley commented on SPARK-19357:
-------------------------------------------

Linking [SPARK-22126], which tracks improving the API to permit model-specific optimizations.

> Parallel Model Evaluation for ML Tuning: Scala
> ----------------------------------------------
>
>                 Key: SPARK-19357
>                 URL: https://issues.apache.org/jira/browse/SPARK-19357
>             Project: Spark
>          Issue Type: Sub-task
>          Components: ML
>            Reporter: Bryan Cutler
>            Assignee: Bryan Cutler
>             Fix For: 2.3.0
>
>         Attachments: parallelism-verification-test.pdf
>
>
> This is a first step of the parent task of Optimizations for ML Pipeline Tuning to perform model evaluation in parallel.  A simple approach is to naively evaluate with a possible parameter to control the level of parallelism.  There are some concerns with this:
> * excessive caching of datasets
> * what to set as the default value for level of parallelism.  1 will evaluate all models in serial, as is done currently. Higher values could lead to excessive caching.



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