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https://issues.apache.org/jira/browse/SPARK-30154?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiangrui Meng resolved SPARK-30154.
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Fix Version/s: 3.0.0
Resolution: Fixed
Issue resolved by pull request 26910
[https://github.com/apache/spark/pull/26910]
> PySpark UDF to convert MLlib vectors to dense arrays
> ----------------------------------------------------
>
> Key: SPARK-30154
> URL: https://issues.apache.org/jira/browse/SPARK-30154
> Project: Spark
> Issue Type: New Feature
> Components: ML, MLlib, PySpark
> Affects Versions: 3.0.0
> Reporter: Xiangrui Meng
> Assignee: Weichen Xu
> Priority: Major
> Fix For: 3.0.0
>
>
> If a PySpark user wants to convert MLlib sparse/dense vectors in a DataFrame
> into dense arrays, an efficient approach is to do that in JVM. However, it
> requires PySpark user to write Scala code and register it as a UDF. Often
> this is infeasible for a pure python project.
> What we can do is to predefine those converters in Scala and expose them in
> PySpark, e.g.:
> {code}
> from pyspark.ml.functions import vector_to_dense_array
> df.select(vector_to_dense_array(col("features"))
> {code}
> cc: [~weichenxu123]
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