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Posted to issues@spark.apache.org by "Hyukjin Kwon (Jira)" <ji...@apache.org> on 2019/10/08 05:44:22 UTC
[jira] [Resolved] (SPARK-14585) Provide accessor methods for
Pipeline stages
[ https://issues.apache.org/jira/browse/SPARK-14585?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon resolved SPARK-14585.
----------------------------------
Resolution: Incomplete
> Provide accessor methods for Pipeline stages
> --------------------------------------------
>
> Key: SPARK-14585
> URL: https://issues.apache.org/jira/browse/SPARK-14585
> Project: Spark
> Issue Type: New Feature
> Components: ML
> Reporter: Joseph K. Bradley
> Priority: Major
> Labels: bulk-closed
>
> It is currently hard to access particular stages in a Pipeline or PipelineModel. Some accessor methods would help.
> Scala:
> {code}
> class Pipeline {
> /** Returns stage at index i in Pipeline */
> def getStage[T <: PipelineStage](i: Int): T
> /** Returns all stages of this type */
> def getStagesOfType[T <: PipelineStage]: Array[T]
> }
> class PipelineModel {
> /** Returns stage at index i in PipelineModel */
> def getStage[T <: Transformer](i: Int): T
> /**
> * Returns stage given its parent or generating instance in PipelineModel.
> * E.g., if this PipelineModel was created from a Pipeline containing a stage
> * {{myStage}}, then passing {{myStage}} to this method will return the
> * corresponding stage in this PipelineModel.
> */
> def getStage[T <: Transformer][implicit E <: PipelineStage](stage: E): T
> /** Returns all stages of this type */
> def getStagesOfType[T <: Transformer]: Array[T]
> }
> {code}
> These methods should not be recursive for now. I.e., if a Pipeline A contains another Pipeline B, then calling {{getStage}} on the outer Pipeline A should not search for the stage within Pipeline B.
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