[jira] [Resolved] (SPARK-7176) Add validation functionality to individual Param

["Xiangrui Meng (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-7176?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xiangrui Meng resolved SPARK-7176.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 1.4.0

Issue resolved by pull request 5740
[https://github.com/apache/spark/pull/5740]

> Add validation functionality to individual Param
> ------------------------------------------------
>
>                 Key: SPARK-7176
>                 URL: https://issues.apache.org/jira/browse/SPARK-7176
>             Project: Spark
>          Issue Type: Sub-task
>          Components: ML
>            Reporter: Joseph K. Bradley
>            Assignee: Joseph K. Bradley
>             Fix For: 1.4.0
>
>
> This issue was brought up by [https://issues.apache.org/jira/browse/SPARK-7147]: There are multiple locations in which a parameter can be specified (in setters and in calling fit/transform), and we should check the parameter value in each one.  It would be nice to avoid duplicating the checking code.
> Proposed change:
> * Add field to class Param: {{val isValid: T => Boolean}}, with default value of always returning true
> * Add helper methods in new ParamCheck object for constructing common validation checks (especially to help Java users)
> * Ensure that this validation is always done, most likely by always settings parameters by constructing a ParamPair + validating inside the ParamPair constructor



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