[
https://issues.apache.org/jira/browse/SPARK-15605?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Yanbo Liang updated SPARK-15605:
--------------------------------
Description:
This bug is reported by
http://apache-spark-developers-list.1001551.n3.nabble.com/Creation-of-SparkML-Estimators-in-Java-broken-td17710.html
.
I found we only implement JavaParams who is the wrappers of Scala Params.
We still need Java-friendly wrappers for other traits who extends from Scala
Params.
For example, in Scala we have:
trait HasLabelCol extends Params
We should have the Java-friendly wrappers as follows:
class JavaHasLabelCol extends Params
Otherwise, "Param.parent" will be null for each param and it will throw
exceptions when calling "Param.hasParam()".
I think the Java compatibility for Params/Param should be further defined, and
it's better to remove the "JavaDeveloperApiExample" which will mislead users.
was:
This bug is reported by
http://apache-spark-developers-list.1001551.n3.nabble.com/Creation-of-SparkML-Estimators-in-Java-broken-td17710.html
.
I found we only implement JavaParams who is the wrappers of Scala Params.
We still need Java-friendly wrappers for other traits who extends from Scala
Params.
For example, in Scala we have:
trait HasLabelCol extends Params
We should have the Java-friendly wrappers as follows:
class JavaHasLabelCol extends Params
Otherwise, "Param.parent" will be null for each param and it will throw
exceptions when calling "Param.hasParam()".
I think the Java compatibility for Params/Param should be further defined, and
it's better to remove the ""
> ML JavaDeveloperApiExample is broken
> ------------------------------------
>
> Key: SPARK-15605
> URL: https://issues.apache.org/jira/browse/SPARK-15605
> Project: Spark
> Issue Type: Bug
> Components: Examples, ML
> Reporter: Yanbo Liang
> Priority: Minor
>
> This bug is reported by
> http://apache-spark-developers-list.1001551.n3.nabble.com/Creation-of-SparkML-Estimators-in-Java-broken-td17710.html
> .
> I found we only implement JavaParams who is the wrappers of Scala Params.
> We still need Java-friendly wrappers for other traits who extends from Scala
> Params.
> For example, in Scala we have:
> trait HasLabelCol extends Params
> We should have the Java-friendly wrappers as follows:
> class JavaHasLabelCol extends Params
> Otherwise, "Param.parent" will be null for each param and it will throw
> exceptions when calling "Param.hasParam()".
> I think the Java compatibility for Params/Param should be further defined,
> and it's better to remove the "JavaDeveloperApiExample" which will mislead
> users.
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