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From "Hyukjin Kwon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-23244) Incorrect handling of default values when deserializing python wrappers of scala transformers
Date Mon, 19 Mar 2018 07:33:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-23244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16404448#comment-16404448
] 

Hyukjin Kwon commented on SPARK-23244:
--------------------------------------

Shall we resolve all duplicates for now? Looks a bit confusing.

> Incorrect handling of default values when deserializing python wrappers of scala transformers
> ---------------------------------------------------------------------------------------------
>
>                 Key: SPARK-23244
>                 URL: https://issues.apache.org/jira/browse/SPARK-23244
>             Project: Spark
>          Issue Type: Bug
>          Components: MLlib
>    Affects Versions: 2.2.1
>            Reporter: Tomas Nykodym
>            Priority: Minor
>
> Default values are not handled properly when serializing/deserializing python trasnformers
which are wrappers around scala objects. It looks like that after deserialization the default
values which were based on uid do not get properly restored and values which were not set
are set to their (original) default values.
> Here's a simple code example using Bucketizer:
> {code:python}
> >>> from pyspark.ml.feature import Bucketizer
> >>> a = Bucketizer() 
> >>> a.save("bucketizer0")
> >>> b = load("bucketizer0") 
> >>> a._defaultParamMap[a.outputCol]
> u'Bucketizer_440bb49206c148989db7__output'
> >>> b._defaultParamMap[b.outputCol]
> u'Bucketizer_41cf9afbc559ca2bfc9a__output'
> >>> a.isSet(a.outputCol)
> False 
> >>> b.isSet(b.outputCol)
> True
> >>> a.getOutputCol()
> u'Bucketizer_440bb49206c148989db7__output'
> >>> b.getOutputCol()
> u'Bucketizer_440bb49206c148989db7__output'
> {code}



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