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https://issues.apache.org/jira/browse/SPARK-28902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17079165#comment-17079165
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chiranjeevi commented on SPARK-28902:
-------------------------------------
Hi team,
i am having the same issue, May i know how can this be fixed ?
> Spark ML Pipeline with nested Pipelines fails to load when saved from Python
> ----------------------------------------------------------------------------
>
> Key: SPARK-28902
> URL: https://issues.apache.org/jira/browse/SPARK-28902
> Project: Spark
> Issue Type: Bug
> Components: ML
> Affects Versions: 2.4.3
> Reporter: Saif Addin
> Priority: Minor
>
> Hi, this error is affecting a bunch of our nested use cases.
> Saving a *PipelineModel* with one of its stages being another
> *PipelineModel*, fails when loading it from Scala if it is saved in Python.
> *Python side:*
>
> {code:java}
> from pyspark.ml import Pipeline
> from pyspark.ml.feature import Tokenizer
> t = Tokenizer()
> p = Pipeline().setStages([t])
> d = spark.createDataFrame([["Hello Peter Parker"]])
> pm = p.fit(d)
> np = Pipeline().setStages([pm])
> npm = np.fit(d)
> npm.write().save('./npm_test')
> {code}
>
>
> *Scala side:*
>
> {code:java}
> scala> import org.apache.spark.ml.PipelineModel
> scala> val pp = PipelineModel.load("./npm_test")
> java.lang.IllegalArgumentException: requirement failed: Error loading
> metadata: Expected class name org.apache.spark.ml.PipelineModel but found
> class name pyspark.ml.pipeline.PipelineModel
> at scala.Predef$.require(Predef.scala:224)
> at
> org.apache.spark.ml.util.DefaultParamsReader$.parseMetadata(ReadWrite.scala:638)
> at
> org.apache.spark.ml.util.DefaultParamsReader$.loadMetadata(ReadWrite.scala:616)
> at org.apache.spark.ml.Pipeline$SharedReadWrite$.load(Pipeline.scala:267)
> at
> org.apache.spark.ml.PipelineModel$PipelineModelReader.load(Pipeline.scala:348)
> at
> org.apache.spark.ml.PipelineModel$PipelineModelReader.load(Pipeline.scala:342)
> at org.apache.spark.ml.util.MLReadable$class.load(ReadWrite.scala:380)
> at org.apache.spark.ml.PipelineModel$.load(Pipeline.scala:332)
> ... 50 elided
> {code}
>
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