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https://issues.apache.org/jira/browse/SPARK-23244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16357268#comment-16357268
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Tomas Nykodym commented on SPARK-23244:
---------------------------------------

I might be wrong but I don't think this is a duplicate. There is an overlap 
between the two in that the default values are set as real values, but:
1) I am not sure if it is in the same context. I looked at the PR addressing 
SPARK-23234 and the changes were in a an unrelated method to my problem. 
2) I don't see how SPARK-23234 addresses how default values based on uid are 
set after deserialization of JavaTransformer.



> 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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