That's is a bug, which will be fixed in
https://github.com/apache/spark/pull/6622. I disabled Model.copy
because models usually doesn't have a default constructor and hence
the default Params.copy implementation won't work. Unfortunately, due
to insufficient test coverage, StringIndexModel.copy is not
implemented. -Xiangrui
On Thu, Jun 4, 2015 at 10:09 PM, Justin Yip wrote:
> Hello,
>
> I have a question with Spark 1.4 ml library. In the copy function, it is
> stated that the default implementation doesn't work of Params doesn't work
> for models.
> (https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/Model.scala#L49)
>
> As a result, some feature generation transformer like "StringIndexerModel"
> cannot be used in Pipeline.
>
> Maybe due to my limited knowledge in ML pipeline, can anyone give me some
> hints why Model.copy behaves differently as other Params?
>
> Thanks!
>
> Justin
>
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