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From "Apache Spark (JIRA)" <>
Subject [jira] [Assigned] (SPARK-21221) CrossValidator and TrainValidationSplit Persist Nested Estimators
Date Tue, 27 Jun 2017 01:11:00 GMT


Apache Spark reassigned SPARK-21221:

    Assignee:     (was: Apache Spark)

> CrossValidator and TrainValidationSplit Persist Nested Estimators
> -----------------------------------------------------------------
>                 Key: SPARK-21221
>                 URL:
>             Project: Spark
>          Issue Type: New Feature
>          Components: ML
>    Affects Versions: 2.1.1
>            Reporter: Ajay Saini
> Currently, the saving of parameters done in ValidatorParams.scala assumes that all parameters
in EstimatorParameterMaps are JSON serializable. Such an assumption causes CrossValidator
and TrainValidationSplit persistence to fail when the internal estimator to these meta-algorithms
is not JSON serializable. One example is OneVsRest which has a classifier (estimator) as a
> The changes would involve removing the assumption in validator params that all the estimator
params are JSON serializable. This could mean saving parameters that are not JSON serializable
separately at a specified path. 

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