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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2016/04/15 17:00:28 UTC
[jira] [Assigned] (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 ]
Apache Spark reassigned SPARK-14585:
------------------------------------
Assignee: Apache Spark
> 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
> Assignee: Apache Spark
>
> 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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